Article
03/01/2023

Security Bulletin

Microsoft Security Bulletin MS12-076 - Important

Vulnerabilities in Microsoft Excel Could Allow Remote Code Execution (2720184)

Published: November 13, 2012

Version: 1.0

General Information

Executive Summary

This security update resolves four privately reported vulnerabilities in Microsoft Office. The vulnerabilities could allow remote code execution if a user opens a specially crafted Excel file with an affected version of Microsoft Excel. An attacker who successfully exploited the vulnerabilities could gain the same user rights as the current user. Users whose accounts are configured to have fewer user rights on the system could be less impacted than users who operate with administrative user rights.

This security update is rated Important for all supported editions of Microsoft Excel 2003, Microsoft Excel 2007, Microsoft Excel 2010, Microsoft Office 2008 for Mac, and Microsoft Office for Mac 2011; it is also rated Important for supported versions of Microsoft Excel Viewer and Microsoft Office Compatibility Pack. For more information, see the subsection, Affected and Non-Affected Software, in this section.

The security update addresses the vulnerabilities by correcting how Microsoft Excel parses and validates data when opening specially crafted Excel files. For more information about the vulnerabilities, see the Frequently Asked Questions (FAQ) subsection for the specific vulnerability entry under the next section, Vulnerability Information.

Recommendation. Customers can configure automatic updating to check online for updates from Microsoft Update by using the Microsoft Update service. Customers who have automatic updating enabled and configured to check online for updates from Microsoft Update typically will not need to take any action because this security update will be downloaded and installed automatically. Customers who have not enabled automatic updating need to check for updates from Microsoft Update and install this update manually. For information about specific configuration options in automatic updating in supported editions of Windows XP and Windows Server 2003, see Microsoft Knowledge Base Article 294871. For information about automatic updating in supported editions of Windows Vista, Windows Server 2008, Windows 7, and Windows Server 2008 R2, see Understanding Windows automatic updating.

For administrators and enterprise installations, or end users who want to install this security update manually, Microsoft recommends that customers apply the update at the earliest opportunity using update management software, or by checking for updates using the Microsoft Update service.

See also the section, Detection and Deployment Tools and Guidance, later in this bulletin.

Known Issues. None

Affected and Non-Affected Software

The following software have been tested to determine which versions or editions are affected. Other versions or editions are either past their support life cycle or are not affected. To determine the support life cycle for your software version or edition, see Microsoft Support Lifecycle.

Affected Software

Microsoft Office Suite and Other Software	Component	Maximum Security Impact	Aggregate Severity Rating	Updates Replaced
Microsoft Office Suites and Components
Microsoft Office 2003 Service Pack 3	Microsoft Excel 2003 Service Pack 3 (KB2687481)	Remote Code Execution	Important	KB2597086 in MS12-030 replaced by KB2687481
Microsoft Office 2007 Service Pack 2	Microsoft Excel 2007 Service Pack 2^[1](KB2687307)	Remote Code Execution	Important	KB2597161 in MS12-030 replaced by KB2687307
Microsoft Office 2007 Service Pack 3	Microsoft Excel 2007 Service Pack 3^[1](KB2687307)	Remote Code Execution	Important	KB2597161 in MS12-030 replaced by KB2687307
Microsoft Office 2010 Service Pack 1 (32-bit editions)	Microsoft Excel 2010 Service Pack 1 (32-bit editions) (KB2597126)	Remote Code Execution	Important	KB2597166 in MS12-030 replaced by KB2597126
Microsoft Office 2010 Service Pack 1 (64-bit editions)	Microsoft Excel 2010 Service Pack 1 (64-bit editions) (KB2597126)	Remote Code Execution	Important	KB2597166 in MS12-030 replaced by KB2597126
Microsoft Office for Mac
Microsoft Office 2008 for Mac (KB2764048)	Not applicable	Remote Code Execution	Important	KB2665346 in MS12-030 replaced by KB2764048
Microsoft Office for Mac 2011 (KB2764047)	Not applicable	Remote Code Execution	Important	KB2721015 in MS12-051 replaced by KB2764047
Other Microsoft Office Software
Microsoft Excel Viewer^[2](KB2687313)	Not applicable	Remote Code Execution	Important	KB2596842 in MS12-030 replaced by KB2687313
Microsoft Office Compatibility Pack Service Pack 2 (KB2687311)	Not applicable	Remote Code Execution	Important	KB2597162 in MS12-030 replaced by KB2687311
Microsoft Office Compatibility Pack Service Pack 3 (KB2687311)	Not applicable	Remote Code Execution	Important	KB2597162 in MS12-030 replaced by KB2687311

^[1]For Microsoft Excel 2007, in addition to security update package KB2687307, customers also need to install the security update for the Microsoft Office Compatibility Pack (KB2687311) to be protected from the vulnerabilities described in this bulletin.

^[2]Microsoft Excel Viewer must be updated to a supported service pack level (Excel Viewer 2007 Service Pack 2 or Excel Viewer 2007 Service Pack 3) before installing this update. For information about supported Office viewers, see Microsoft Knowledge Base Article 979860.

Non-Affected Software

Office and Other Software
Microsoft Excel Web App 2010 Service Pack 1
Microsoft Excel Web App 2013
Microsoft Excel 2013 (32-bit editions)
Microsoft Excel 2013 (64-bit editions)
Microsoft Excel 2013 RT
Excel Services on Microsoft SharePoint Server 2007 Service Pack 2 (32-bit editions)
Excel Services on Microsoft SharePoint Server 2007 Service Pack 2 (64-bit editions)
Excel Services on Microsoft SharePoint Server 2007 Service Pack 3 (32-bit editions)
Excel Services on Microsoft SharePoint Server 2007 Service Pack 3 (64-bit editions)
Excel Services on Microsoft SharePoint Server 2010 Service Pack 1

Where are the file information details?
Refer to the reference tables in the Security Update Deployment section for the location of the file information details.

Where are the hashes of the security updates?
The SHA1 and SHA2 hashes of the security updates can be used to verify the authenticity of downloaded security update packages. For the hash information pertaining to this update, see Microsoft Knowledge Base Article 2720184.

Why does this update address several reported security vulnerabilities?
This update contains support for several vulnerabilities because the modifications that are required to address these issues are located in related files.

What components of the Microsoft Office Compatibility Pack are updated by this bulletin?
The update included with this security bulletin applies only to the Microsoft Excel component within the Microsoft Office Compatibility Pack.

How areMicrosoft Office standalone programs affected by the vulnerabilities?
A Microsoft Office standalone program is affected with the same severity rating as the corresponding component in a Microsoft Office Suite. For example, a standalone installation of Microsoft Excel is affected with the same severity rating as an installation of Microsoft Excel that was delivered with a Microsoft Office Suite.

The Microsoft Office component discussed in this article is part of the Microsoft Office Suite that I have installed on my system; however, I did not choose to install this specific component. Will I be offered this update?
Yes, if the component discussed in this bulletin was delivered with the version of the Microsoft Office Suite installed on your system, the system will be offered updates for it whether the component is installed or not. The detection logic used to scan for affected systems is designed to check for updates for all components that were delivered with the particular Microsoft Office Suite and to offer the updates to a system. Users who choose not to apply an update for a component that is not installed, but is delivered with their version of the Microsoft Office Suite, will not increase the security risk of that system. On the other hand, users who do choose to install the update will not have a negative impact on the security or performance of a system.

Does the offer to update a non-vulnerable version of Microsoft Office constitute an issue in the Microsoft update mechanism?
No, the update mechanism is functioning correctly in that it detects a lower version of the files on the system than in the update package and thus, offers the update.

I am using an older release of the software discussed in this security bulletin. What should I do?
The affected software listed in this bulletin have been tested to determine which releases are affected. Other releases are past their support life cycle. For more information about the product lifecycle, see the Microsoft Support Lifecycle website.

It should be a priority for customers who have older releases of the software to migrate to supported releases to prevent potential exposure to vulnerabilities. To determine the support lifecycle for your software release, see Select a Product for Lifecycle Information. For more information about service packs for these software releases, see Service Pack Lifecycle Support Policy.

Customers who require custom support for older software must contact their Microsoft account team representative, their Technical Account Manager, or the appropriate Microsoft partner representative for custom support options. Customers without an Alliance, Premier, or Authorized Contract can contact their local Microsoft sales office. For contact information, see the Microsoft Worldwide Information website, select the country in the Contact Information list, and then click Go to see a list of telephone numbers. When you call, ask to speak with the local Premier Support sales manager. For more information, see the Microsoft Support Lifecycle Policy FAQ.

Vulnerability Information

Severity Ratings and Vulnerability Identifiers

The following severity ratings assume the potential maximum impact of the vulnerability. For information regarding the likelihood, within 30 days of this security bulletin's release, of the exploitability of the vulnerability in relation to its severity rating and security impact, please see the Exploitability Index in the November bulletin summary. For more information, see Microsoft Exploitability Index.

Affected Software	Excel SerAuxErrBar Heap Overflow Vulnerability - CVE-2012-1885	Excel Memory Corruption Vulnerability - CVE-2012-1886	Excel SST Invalid Length Use After Free Vulnerability - CVE-2012-1887	Excel Stack Overflow Vulnerability - CVE-2012-2543	Aggregate Severity Rating
Microsoft Office Suites and Components
Microsoft Excel 2003 Service Pack 3	Important Remote Code Execution	Important Remote Code Execution	Important Remote Code Execution	Not applicable	Important
Microsoft Excel 2007 Service Pack 2	Important Remote Code Execution	Important Remote Code Execution	Important Remote Code Execution	Important Remote Code Execution	Important
Microsoft Excel 2007 Service Pack 3	Important Remote Code Execution	Important Remote Code Execution	Important Remote Code Execution	Important Remote Code Execution	Important
Microsoft Excel 2010 Service Pack 1 (32-bit editions)	Important Remote Code Execution	Important Remote Code Execution	Important Remote Code Execution	Important Remote Code Execution	Important
Microsoft Excel 2010 Service Pack 1 (64-bit editions)	Important Remote Code Execution	Important Remote Code Execution	Important Remote Code Execution	Important Remote Code Execution	Important
Microsoft Office for Mac
Microsoft Office 2008 for Mac	Important Remote Code Execution	Not applicable	Important Remote Code Execution	Not applicable	Important
Microsoft Office for Mac 2011	Important Remote Code Execution	Not applicable	Important Remote Code Execution	Important Remote Code Execution	Important
Other Microsoft Office Software
Microsoft Excel Viewer	Not applicable	Important Remote Code Execution	Not applicable	Important Remote Code Execution	Important
Microsoft Office Compatibility Pack Service Pack 2	Important Remote Code Execution	Important Remote Code Execution	Not applicable	Important Remote Code Execution	Important
Microsoft Office Compatibility Pack Service Pack 3	Important Remote Code Execution	Important Remote Code Execution	Not applicable	Important Remote Code Execution	Important

Excel SerAuxErrBar Heap Overflow Vulnerability - CVE-2012-1885

A remote code execution vulnerability exists in the way that Microsoft Excel handles specially crafted Excel files. An attacker who successfully exploited this vulnerability could take complete control of an affected system. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights.

To view this vulnerability as a standard entry in the Common Vulnerabilities and Exposures list, see CVE-2012-1885.

Mitigating Factors for Excel SerAuxErrBar Heap Overflow Vulnerability - CVE-2012-1885

Mitigation refers to a setting, common configuration, or general best-practice, existing in a default state, that could reduce the severity of exploitation of a vulnerability. The following mitigating factors may be helpful in your situation:

In a web-based attack scenario, an attacker could host a website that contains an Excel file that is used to exploit this vulnerability. In addition, compromised websites and websites that accept or host user-provided content or advertisements could contain specially crafted content that could exploit this vulnerability. In all cases, however, an attacker would have no way to force users to visit these websites. Instead, an attacker would have to convince users to visit the website, typically by getting them to click a link in an email message or Instant Messenger message that takes them to the attacker's website, and then convince them to open the specially crafted Excel file.
An attacker who successfully exploited this vulnerability could gain the same user rights as the current user. Users whose accounts are configured to have fewer user rights on the system could be less impacted than users who operate with administrative user rights.
The vulnerability cannot be exploited automatically through email. For an attack to be successful a user must open an attachment that is sent in an email message.

Workarounds for Excel SerAuxErrBar Heap Overflow Vulnerability - CVE-2012-1885

Workaround refers to a setting or configuration change that does not correct the underlying vulnerability but would help block known attack vectors before you apply the update. Microsoft has tested the following workarounds and states in the discussion whether a workaround reduces functionality:

Use Microsoft Office File Block policy to block the opening of Office 2003 and earlier documents from unknown or untrusted sources and locations
Microsoft Office File Block policy can be used to block specific file format types from opening in Microsoft Word, Microsoft Excel, and Microsoft PowerPoint.

For Microsoft Office 2003 and Microsoft Office 2007

The following registry scripts can be saved in registry entry (.reg) files and used to set the File Block policy. For more information on how to use registry scripts, see Microsoft Knowledge Base Article 310516.

Note In order to use 'FileOpenBlock' with Microsoft Office 2003, all of the latest security updates for Microsoft Office 2003 must be applied. In order to use 'FileOpenBlock' with Microsoft Office 2007, all of the latest security updates for Office 2007 must be applied.

Microsoft Office Software	Registry Script
Microsoft Excel 2003	Windows Registry Editor Version 5.00\ \ [HKEY_CURRENT_USER\Software\Microsoft\Office\11.0\Excel\Security\FileOpenBlock]\ \ "BinaryFiles"=dword:00000001\
Microsoft Excel 2007	Windows Registry Editor Version 5.00\ \ [HKEY_CURRENT_USER\Software\Policies\Microsoft\Office\12.0\Excel\Security\FileOpenBlock]\ \ "BinaryFiles"=dword:00000001

For Microsoft Office 2010

Open Microsoft Excel 2010 and perform the following steps:

Click the File tab.
Under Help, click Options.
Click Trust Center, and then click Trust Center Settings.
In the Trust Center, click File Block Settings.
Ensure the Open check box is selected for the following file types: In Microsoft Excel 2010:
- Excel 2007 and later Binary Workbooks
- Excel 97-2003 Add-in Files
- Excel 97-2003 Workbooks and Templates
- Excel 95-97 Workbooks and Templates
- Excel 95 Workbooks
- Excel 4 Workbooks
- Excel 4 Worksheets
- Excel 3 Worksheets
- Excel 2 Worksheets
Under Open behavior for selected file types, select Do not open selected file types or select Open selected file types in Protected View. Either choice will block the attack vector to the vulnerable code.
Click OK to apply the File Block Settings.

Alternatively, file block can be applied using Group Policy. For more information, see the TechNet article, Plan file block settings for Office 2010.

Impact of workaround. For Microsoft Office 2003 and Microsoft Office 2007, users who have configured the File Block policy and have not configured a special exempt directory or have not moved files to a trusted location will be unable to open Office 2003 files or earlier versions. For Microsoft Office 2010, Office 2003 files or earlier versions will either be blocked from opening or will be opened in protected mode depending on the open behavior that was selected. For more information about the impact of file block setting in Microsoft Office software, see Microsoft Knowledge Base Article 922850.

How to undo the workaround.

For Microsoft Office 2003 and Microsoft Office 2007, use the following registry scripts to undo the settings used to set the File Block policy:

Microsoft Office Software	Registry Script
Microsoft Excel 2003	Windows Registry Editor Version 5.00\ \ [HKEY_CURRENT_USER\Software\Microsoft\Office\11.0\PowerPoint\Security\FileOpenBlock]\ \ "BinaryFiles"=dword:00000000
Microsoft Excel 2007	Windows Registry Editor Version 5.00\ \ [HKEY_CURRENT_USER\Software\Policies\Microsoft\Office\12.0\Excel\Security\FileOpenBlock]\ \ "BinaryFiles"=dword:00000000

For Microsoft Office 2010, open Microsoft Excel 2010 and perform the following steps:

Click the File tab.
Under Help, click Options.
Click Trust Center, and then click Trust Center Settings.
In the Trust Center, click File Block Settings.
Clear the Open check box for the file types that you previously selected.
Click OK to apply the File Block settings.

Use the Microsoft Office Isolated Conversion Environment (MOICE) when opening files from unknown or untrusted sources
Note Modifying the Registry incorrectly can cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that problems resulting from incorrect modification of the Registry can be solved. Modify the Registry at your own risk.

The Microsoft Office Isolated Conversion Environment (MOICE) helps protect Office 2003 installations by more securely opening Word, Excel, and PowerPoint binary format files.

To install MOICE, you must have Office 2003 or Office 2007 installed.

To install MOICE, you must also have the Compatibility Pack for Word, Excel, and PowerPoint 2007 File Formats. The compatibility pack is available as a free download from the Microsoft Download Center.

MOICE requires all updates that are recommended for all Office programs. Visit Microsoft Update to install all recommended updates.

Enable MOICE

Note See Microsoft Knowledge Base Article 935865 to use the automated Microsoft Fix it solution to enable or disable this workaround.

To manually enable MOICE, run the commands as specified in the following table. Running the commands will associate the Office application extensions with MOICE.

Command to enable MOICE to be the registered handler
For Word, run the following command from a command prompt:\ ASSOC .doc=oice.word.document
For Excel, run the following commands from a command prompt:\ ASSOC .XLS=oice.excel.sheet\ ASSOC .XLT=oice.excel.template\ ASSOC .XLA=oice.excel.addin
For PowerPoint, run the following commands from a command prompt:\ ASSOC .PPT=oice.powerpoint.show\ ASSOC .POT=oice.powerpoint.template\ ASSOC .PPS=oice.powerpoint.slideshow

Note On Windows Vista, Windows Server 2008, Windows 7, and Windows Server 2008 R2, run the above commands from an elevated command prompt.

For more information on MOICE, see Microsoft Knowledge Base Article 935865.

Impact of workaround. Office 2003 and earlier formatted documents that are converted to the Microsoft Office 2007 Open XML format by MOICE will not retain macro functionality. Additionally, documents with passwords or that are protected with Digital Rights Management cannot be converted.

How to undo the workaround. Run the commands to disable MOICE as specified in the table below.

Command to disable MOICE as the registered handler
For Word, run the following command from a command prompt:\ ASSOC .doc=Word.Document.8
For Excel, run the following commands from a command prompt:\ ASSOC .xls=Excel.Sheet.8\ ASSOC .xlt=Excel.Template\ ASSOC .xla=Excel.Addin
For PowerPoint, run the following commands from a command prompt:\ ASSOC .ppt=PowerPoint.Show.8\ ASSOC .pot=PowerPoint.Template.8\ ASSOC .pps=PowerPoint.SlideShow.8

Note On Windows Vista, Windows Server 2008, Windows 7, and Windows Server 2008 R2, run the above commands from an elevated command prompt.

Do not open Excel files that you receive from untrusted sources or that you receive unexpectedly from trusted sources
Do not open or save Microsoft Excel files that you receive from untrusted sources or that you receive unexpectedly from trusted sources. This vulnerability could be exploited when a user opens a specially crafted file.

FAQ for Excel SerAuxErrBar Heap Overflow Vulnerability - CVE-2012-1885

What is the scope of the vulnerability?
This is a remote code execution vulnerability.

What causes the vulnerability?
The vulnerability exists in the way that Microsoft Excel handles memory when opening specially crafted Excel files.

What might an attacker use the vulnerability to do?
An attacker who successfully exploited this vulnerability could run arbitrary code as the current user. If the current user is logged on with administrative user rights, an attacker could take complete control of the affected system. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights. Users whose accounts are configured to have fewer user rights on the system could be less impacted than users who operate with administrative user rights.

How could an attacker exploit the vulnerability?
This vulnerability requires that a user open a specially crafted Excel file with an affected version of Microsoft Excel.

In an email attack scenario, an attacker could exploit the vulnerability by sending a specially crafted Excel file to the user and by convincing the user to open the file.

In a web-based attack scenario, an attacker would have to host a website that contains a specially crafted Excel file that is used to attempt to exploit this vulnerability. In addition, compromised websites and websites that accept or host user-provided content could contain specially crafted content that could exploit this vulnerability. An attacker would have no way to force users to visit a specially crafted website. Instead, an attacker would have to convince users to visit the website, typically by getting them to click a link that takes them to the attacker's site, and then convince them to open the specially crafted Excel file.

What systems are primarily at risk from the vulnerability?
Systems where Microsoft Excel is used, including workstations and terminal servers, are primarily at risk. Servers could be at more risk if administrators allow users to log on to servers and to run programs. However, best practices strongly discourage allowing this.

What does the update do?
The update addresses the vulnerability by correcting how Microsoft Excel parses data when opening specially crafted Excel files.

When this security bulletin was issued, had this vulnerability been publicly disclosed?
No. Microsoft received information about this vulnerability through coordinated vulnerability disclosure.

When this security bulletin was issued, had Microsoft received any reports that this vulnerability was being exploited?
No. Microsoft had not received any information to indicate that this vulnerability had been publicly used to attack customers when this security bulletin was originally issued.

Excel Memory Corruption Vulnerability - CVE-2012-1886

To view this vulnerability as a standard entry in the Common Vulnerabilities and Exposures list, see CVE-2012-1886.

Mitigating Factors for Excel Memory Corruption Vulnerability - CVE-2012-1886

In a web-based attack scenario, an attacker could host a website that contains an Excel file that is used to exploit this vulnerability. In addition, compromised websites and websites that accept or host user-provided content or advertisements could contain specially crafted content that could exploit this vulnerability. In all cases, however, an attacker would have no way to force users to visit these websites. Instead, an attacker would have to convince users to visit the website, typically by getting them to click a link in an email message or Instant Messenger message that takes them to the attacker's website, and then convince them to open the specially crafted Excel file.
An attacker who successfully exploited this vulnerability could gain the same user rights as the current user. Users whose accounts are configured to have fewer user rights on the system could be less impacted than users who operate with administrative user rights.
The vulnerability cannot be exploited automatically through email. For an attack to be successful a user must open an attachment that is sent in an email message.

Workarounds for Excel Memory Corruption Vulnerability - CVE-2012-1886

Set Office File Validation to disable the opening of files that fail validation in Excel 2003 and Excel 2007
Note Before applying this workaround, Office File Validation must be enabled for your version of Microsoft Office. For information on how to enable Office File Validation in Microsoft Office 2003 and Microsoft Office 2007, see the TechNet article, Office File Validation for Office 2003 and Office 2007.

The following registry scripts can be saved in registry entry (.reg) files and used to disable editing of files that fail file validation. For more information on how to use registry scripts, see Microsoft Knowledge Base Article 310516.

Note See Microsoft Knowledge Base Article 2501584 to use the automated Microsoft Fix it solution to enable or disable this workaround in the appropriate Office software.

Note Modifying the Registry incorrectly can cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that problems resulting from incorrect modification of the Registry can be solved. Modify the Registry at your own risk.

Use the registry script that is appropriate for your Office software.

Microsoft Office Software	Registry Script
Microsoft Excel 2003	Windows Registry Editor Version 5.00\ \ [HKEY_CURRENT_USER\Software\Microsoft\Office\11.0\Excel\Security\FileValidation]\ \ "InvalidFileUIOptions"=dword:00000001
Microsoft Excel 2007	Windows Registry Editor Version 5.00\ \ [HKEY_CURRENT_USER\Software\Microsoft\Office\12.0\Excel\Security\FileValidation]\ \ "InvalidFileUIOptions"=dword:00000001

Impact of workaround. Office File Validation will no longer allow the opening of suspicious files.

How to undo the workaround.

Use the appropriate registry script for your software to undo the settings set by this workaround.

Microsoft Office Software	Registry Script
Microsoft Excel 2003	Windows Registry Editor Version 5.00\ \ [HKEY_CURRENT_USER\Software\Microsoft\Office\11.0\Excel\Security\FileValidation]\ \ "InvalidFileUIOptions"=dword:00000000
Microsoft Excel 2007	Windows Registry Editor Version 5.00\ \ [HKEY_CURRENT_USER\Software\Microsoft\Office\12.0\Excel\Security\FileValidation]\ \ "InvalidFileUIOptions"=dword:00000000

Set Office File Validation to disable the edit in Protected View of files that fail validation in Excel 2010
The following registry scripts can be saved in registry entry (.reg) files and used to disable editing of files that fail file validation. For more information on how to use registry scripts, see Microsoft Knowledge Base Article 310516.

Note See Microsoft Knowledge Base Article 2501584 to use the automated Microsoft Fix it solution to enable or disable this workaround in the appropriate Office software.

Note Modifying the Registry incorrectly can cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that problems resulting from incorrect modification of the Registry can be solved. Modify the Registry at your own risk.

Use the registry script that is appropriate for your Office software.

Microsoft Office Software	Registry Script
Microsoft Excel 2010	Windows Registry Editor Version 5.00\ \ [HKEY_CURRENT_USER\Software\Microsoft\Office\14.0\Excel\Security\FileValidation]\ \ "DisableEditFromPV"=dword:00000001

Impact of workaround. Office File Validation will no longer allow the editing of suspicious files.

How to undo the workaround.

Use the appropriate registry script for your software to undo the settings set by this workaround.

Microsoft Office Software	Registry Script
Microsoft Excel 2010	Windows Registry Editor Version 5.00\ \ [HKEY_CURRENT_USER\Software\Microsoft\Office\14.0\Excel\Security\FileValidation]\ \ "DisableEditFromPV"=dword:00000000

Use Microsoft Office File Block policy to block the opening of Office 2003 and earlier documents from unknown or untrusted sources and locations
Microsoft Office File Block policy can be used to block specific file format types from opening in Microsoft Word, Microsoft Excel, and Microsoft PowerPoint.

For Microsoft Office 2003 and Microsoft Office 2007

The following registry scripts can be saved in registry entry (.reg) files and used to set the File Block policy. For more information on how to use registry scripts, see Microsoft Knowledge Base Article 310516.

Note In order to use 'FileOpenBlock' with Microsoft Office 2003, all of the latest security updates for Microsoft Office 2003 must be applied. In order to use 'FileOpenBlock' with Microsoft Office 2007, all of the latest security updates for Office 2007 must be applied.

Microsoft Office Software	Registry Script
Microsoft Excel 2003	Windows Registry Editor Version 5.00\ \ [HKEY_CURRENT_USER\Software\Microsoft\Office\11.0\Excel\Security\FileOpenBlock]\ \ "BinaryFiles"=dword:00000001\
Microsoft Excel 2007	Windows Registry Editor Version 5.00\ \ [HKEY_CURRENT_USER\Software\Policies\Microsoft\Office\12.0\Excel\Security\FileOpenBlock]\ \ "BinaryFiles"=dword:00000001

For Microsoft Office 2010

Open Microsoft Excel 2010 and perform the following steps:

Click the File tab.
Under Help, click Options.
Click Trust Center, and then click Trust Center Settings.
In the Trust Center, click File Block Settings.
Ensure the Open check box is selected for the following file types: In Microsoft Excel 2010:
- Excel 2007 and later Binary Workbooks
- Excel 97-2003 Add-in Files
- Excel 97-2003 Workbooks and Templates
- Excel 95-97 Workbooks and Templates
- Excel 95 Workbooks
- Excel 4 Workbooks
- Excel 4 Worksheets
- Excel 3 Worksheets
- Excel 2 Worksheets
Under Open behavior for selected file types, select Do not open selected file types or select Open selected file types in Protected View. Either choice will block the attack vector to the vulnerable code.
Click OK to apply the File Block Settings.

Alternatively, file block can be applied using Group Policy. For more information, see the TechNet article, Plan file block settings for Office 2010.

How to undo the workaround.

For Microsoft Office 2003 and Microsoft Office 2007, use the following registry scripts to undo the settings used to set the File Block policy:

Microsoft Office Software	Registry Script
Microsoft Excel 2003	Windows Registry Editor Version 5.00\ \ [HKEY_CURRENT_USER\Software\Microsoft\Office\11.0\PowerPoint\Security\FileOpenBlock]\ \ "BinaryFiles"=dword:00000000
Microsoft Excel 2007	Windows Registry Editor Version 5.00\ \ [HKEY_CURRENT_USER\Software\Policies\Microsoft\Office\12.0\Excel\Security\FileOpenBlock]\ \ "BinaryFiles"=dword:00000000

For Microsoft Office 2010, open Microsoft Excel 2010 and perform the following steps:

Click the File tab.
Under Help, click Options.
Click Trust Center, and then click Trust Center Settings.
In the Trust Center, click File Block Settings.
Clear the Open check box for the file types that you previously selected.
Click OK to apply the File Block settings.

Use the Microsoft Office Isolated Conversion Environment (MOICE) when opening files from unknown or untrusted sources
Note Modifying the Registry incorrectly can cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that problems resulting from incorrect modification of the Registry can be solved. Modify the Registry at your own risk.

The Microsoft Office Isolated Conversion Environment (MOICE) helps protect Office 2003 installations by more securely opening Word, Excel, and PowerPoint binary format files.

To install MOICE, you must have Office 2003 or Office 2007 installed.

To install MOICE, you must also have the Compatibility Pack for Word, Excel, and PowerPoint 2007 File Formats. The compatibility pack is available as a free download from the Microsoft Download Center.

MOICE requires all updates that are recommended for all Office programs. Visit Microsoft Update to install all recommended updates.

Enable MOICE

Note See Microsoft Knowledge Base Article 935865 to use the automated Microsoft Fix it solution to enable or disable this workaround.

To manually enable MOICE, run the commands as specified in the following table. Running the commands will associate the Office application extensions with MOICE.

Command to enable MOICE to be the registered handler
For Word, run the following command from a command prompt:\ ASSOC .doc=oice.word.document
For Excel, run the following commands from a command prompt:\ ASSOC .XLS=oice.excel.sheet\ ASSOC .XLT=oice.excel.template\ ASSOC .XLA=oice.excel.addin
For PowerPoint, run the following commands from a command prompt:\ ASSOC .PPT=oice.powerpoint.show\ ASSOC .POT=oice.powerpoint.template\ ASSOC .PPS=oice.powerpoint.slideshow

Note On Windows Vista, Windows Server 2008, Windows 7, and Windows Server 2008 R2, run the above commands from an elevated command prompt.

For more information on MOICE, see Microsoft Knowledge Base Article 935865.

How to undo the workaround. Run the commands to disable MOICE as specified in the table below.

Command to disable MOICE as the registered handler
For Word, run the following command from a command prompt:\ ASSOC .doc=Word.Document.8
For Excel, run the following commands from a command prompt:\ ASSOC .xls=Excel.Sheet.8\ ASSOC .xlt=Excel.Template\ ASSOC .xla=Excel.Addin
For PowerPoint, run the following commands from a command prompt:\ ASSOC .ppt=PowerPoint.Show.8\ ASSOC .pot=PowerPoint.Template.8\ ASSOC .pps=PowerPoint.SlideShow.8

Note On Windows Vista, Windows Server 2008, Windows 7, and Windows Server 2008 R2, run the above commands from an elevated command prompt.

Do not open Excel files that you receive from untrusted sources or that you receive unexpectedly from trusted sources
Do not open or save Microsoft Excel files that you receive from untrusted sources or that you receive unexpectedly from trusted sources. This vulnerability could be exploited when a user opens a specially crafted file.

FAQ for Excel Memory Corruption Vulnerability - CVE-2012-1886

What is the scope of the vulnerability?
This is a remote code execution vulnerability.

What causes the vulnerability?
The vulnerability exists in the way that Microsoft Excel handles memory when opening specially crafted Excel files.

How could an attacker exploit the vulnerability?
This vulnerability requires that a user open a specially crafted Excel file with an affected version of Microsoft Excel.

In an email attack scenario, an attacker could exploit the vulnerability by sending a specially crafted Excel file to the user and by convincing the user to open the file.

What does the update do?
The update addresses the vulnerability by correcting how Microsoft Excel validates data when opening specially crafted Excel files.

When this security bulletin was issued, had this vulnerability been publicly disclosed?
No. Microsoft received information about this vulnerability through coordinated vulnerability disclosure.

When this security bulletin was issued, had Microsoft received any reports that this vulnerability was being exploited?
No. Microsoft had not received any information to indicate that this vulnerability had been publicly used to attack customers when this security bulletin was originally issued.

Excel SST Invalid Length Use After Free Vulnerability - CVE-2012-1887

To view this vulnerability as a standard entry in the Common Vulnerabilities and Exposures list, see CVE-2012-1887.

Mitigating Factors for Excel SST Invalid Length Use After Free Vulnerability - CVE-2012-1887

In a web-based attack scenario, an attacker could host a website that contains an Excel file that is used to exploit this vulnerability. In addition, compromised websites and websites that accept or host user-provided content or advertisements could contain specially crafted content that could exploit this vulnerability. In all cases, however, an attacker would have no way to force users to visit these websites. Instead, an attacker would have to convince users to visit the website, typically by getting them to click a link in an email message or Instant Messenger message that takes them to the attacker's website, and then convince them to open the specially crafted Excel file.
An attacker who successfully exploited this vulnerability could gain the same user rights as the current user. Users whose accounts are configured to have fewer user rights on the system could be less impacted than users who operate with administrative user rights.
The vulnerability cannot be exploited automatically through email. For an attack to be successful a user must open an attachment that is sent in an email message.

Workarounds for Excel SST Invalid Length Use After Free Vulnerability - CVE-2012-1887

Use Microsoft Office File Block policy to block the opening of Office 2003 and earlier documents from unknown or untrusted sources and locations
Microsoft Office File Block policy can be used to block specific file format types from opening in Microsoft Word, Microsoft Excel, and Microsoft PowerPoint.

For Microsoft Office 2003 and Microsoft Office 2007

The following registry scripts can be saved in registry entry (.reg) files and used to set the File Block policy. For more information on how to use registry scripts, see Microsoft Knowledge Base Article 310516.

Note In order to use 'FileOpenBlock' with Microsoft Office 2003, all of the latest security updates for Microsoft Office 2003 must be applied. In order to use 'FileOpenBlock' with Microsoft Office 2007, all of the latest security updates for Office 2007 must be applied.

Microsoft Office Software	Registry Script
Microsoft Excel 2003	Windows Registry Editor Version 5.00\ \ [HKEY_CURRENT_USER\Software\Microsoft\Office\11.0\Excel\Security\FileOpenBlock]\ \ "BinaryFiles"=dword:00000001\
Microsoft Excel 2007	Windows Registry Editor Version 5.00\ \ [HKEY_CURRENT_USER\Software\Policies\Microsoft\Office\12.0\Excel\Security\FileOpenBlock]\ \ "BinaryFiles"=dword:00000001

For Microsoft Office 2010

Open Microsoft Excel 2010 and perform the following steps:

Click the File tab.
Under Help, click Options.
Click Trust Center, and then click Trust Center Settings.
In the Trust Center, click File Block Settings.
Ensure the Open check box is selected for the following file types: In Microsoft Excel 2010:
- Excel 2007 and later Binary Workbooks
- Excel 97-2003 Add-in Files
- Excel 97-2003 Workbooks and Templates
- Excel 95-97 Workbooks and Templates
- Excel 95 Workbooks
- Excel 4 Workbooks
- Excel 4 Worksheets
- Excel 3 Worksheets
- Excel 2 Worksheets
Under Open behavior for selected file types, select Do not open selected file types or select Open selected file types in Protected View. Either choice will block the attack vector to the vulnerable code.
Click OK to apply the File Block Settings.

Alternatively, file block can be applied using Group Policy. For more information, see the TechNet article, Plan file block settings for Office 2010.

How to undo the workaround.

For Microsoft Office 2003 and Microsoft Office 2007, use the following registry scripts to undo the settings used to set the File Block policy:

Microsoft Office Software	Registry Script
Microsoft Excel 2003	Windows Registry Editor Version 5.00\ \ [HKEY_CURRENT_USER\Software\Microsoft\Office\11.0\PowerPoint\Security\FileOpenBlock]\ \ "BinaryFiles"=dword:00000000
Microsoft Excel 2007	Windows Registry Editor Version 5.00\ \ [HKEY_CURRENT_USER\Software\Policies\Microsoft\Office\12.0\Excel\Security\FileOpenBlock]\ \ "BinaryFiles"=dword:00000000

For Microsoft Office 2010, open Microsoft Excel 2010 and perform the following steps:

Click the File tab.
Under Help, click Options.
Click Trust Center, and then click Trust Center Settings.
In the Trust Center, click File Block Settings.
Clear the Open check box for the file types that you previously selected.
Click OK to apply the File Block settings.

Use the Microsoft Office Isolated Conversion Environment (MOICE) when opening files from unknown or untrusted sources
Note Modifying the Registry incorrectly can cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that problems resulting from incorrect modification of the Registry can be solved. Modify the Registry at your own risk.

The Microsoft Office Isolated Conversion Environment (MOICE) helps protect Office 2003 installations by more securely opening Word, Excel, and PowerPoint binary format files.

To install MOICE, you must have Office 2003 or Office 2007 installed.

To install MOICE, you must also have the Compatibility Pack for Word, Excel, and PowerPoint 2007 File Formats. The compatibility pack is available as a free download from the Microsoft Download Center.

MOICE requires all updates that are recommended for all Office programs. Visit Microsoft Update to install all recommended updates.

Enable MOICE

Note See Microsoft Knowledge Base Article 935865 to use the automated Microsoft Fix it solution to enable or disable this workaround.

To manually enable MOICE, run the commands as specified in the following table. Running the commands will associate the Office application extensions with MOICE.

Command to enable MOICE to be the registered handler
For Word, run the following command from a command prompt:\ ASSOC .doc=oice.word.document
For Excel, run the following commands from a command prompt:\ ASSOC .XLS=oice.excel.sheet\ ASSOC .XLT=oice.excel.template\ ASSOC .XLA=oice.excel.addin
For PowerPoint, run the following commands from a command prompt:\ ASSOC .PPT=oice.powerpoint.show\ ASSOC .POT=oice.powerpoint.template\ ASSOC .PPS=oice.powerpoint.slideshow

Note On Windows Vista, Windows Server 2008, Windows 7, and Windows Server 2008 R2, run the above commands from an elevated command prompt.

For more information on MOICE, see Microsoft Knowledge Base Article 935865.

How to undo the workaround. Run the commands to disable MOICE as specified in the table below.

Command to disable MOICE as the registered handler
For Word, run the following command from a command prompt:\ ASSOC .doc=Word.Document.8
For Excel, run the following commands from a command prompt:\ ASSOC .xls=Excel.Sheet.8\ ASSOC .xlt=Excel.Template\ ASSOC .xla=Excel.Addin
For PowerPoint, run the following commands from a command prompt:\ ASSOC .ppt=PowerPoint.Show.8\ ASSOC .pot=PowerPoint.Template.8\ ASSOC .pps=PowerPoint.SlideShow.8

Note On Windows Vista, Windows Server 2008, Windows 7, and Windows Server 2008 R2, run the above commands from an elevated command prompt.

Do not open Excel files that you receive from untrusted sources or that you receive unexpectedly from trusted sources
Do not open or save Microsoft Excel files that you receive from untrusted sources or that you receive unexpectedly from trusted sources. This vulnerability could be exploited when a user opens a specially crafted file.

FAQ for Excel SST Invalid Length Use After Free Vulnerability - CVE-2012-1887

What is the scope of the vulnerability?
This is a remote code execution vulnerability.

What causes the vulnerability?
The vulnerability exists in the way that Microsoft Excel handles memory when opening specially crafted Excel files.

How could an attacker exploit the vulnerability?
This vulnerability requires that a user open a specially crafted Excel file with an affected version of Microsoft Excel.

In an email attack scenario, an attacker could exploit the vulnerability by sending a specially crafted Excel file to the user and by convincing the user to open the file.

What does the update do?
The update addresses the vulnerability by correcting how Microsoft Excel validates data when opening specially crafted Excel files.

When this security bulletin was issued, had this vulnerability been publicly disclosed?
No. Microsoft received information about this vulnerability through coordinated vulnerability disclosure.

Excel Stack Overflow Vulnerability - CVE-2012-2543

To view this vulnerability as a standard entry in the Common Vulnerabilities and Exposures list, see CVE-2012-2543.

Mitigating Factors for Excel Stack Overflow Vulnerability - CVE-2012-2543

In a web-based attack scenario, an attacker could host a website that contains an Excel file that is used to exploit this vulnerability. In addition, compromised websites and websites that accept or host user-provided content or advertisements could contain specially crafted content that could exploit this vulnerability. In all cases, however, an attacker would have no way to force users to visit these websites. Instead, an attacker would have to convince users to visit the website, typically by getting them to click a link in an email message or Instant Messenger message that takes them to the attacker's website, and then convince them to open the specially crafted Excel file.
An attacker who successfully exploited this vulnerability could gain the same user rights as the current user. Users whose accounts are configured to have fewer user rights on the system could be less impacted than users who operate with administrative user rights.
The vulnerability cannot be exploited automatically through email. For an attack to be successful a user must open an attachment that is sent in an email message.

Workarounds for Excel Stack Overflow Vulnerability - CVE-2012-2543

Set Office File Validation to disable the opening of files that fail validation in Excel 2003 and Excel 2007
Note Before applying this workaround, Office File Validation must be enabled for your version of Microsoft Office. For information on how to enable Office File Validation in Microsoft Office 2003 and Microsoft Office 2007, see the TechNet article, Office File Validation for Office 2003 and Office 2007.

The following registry scripts can be saved in registry entry (.reg) files and used to disable editing of files that fail file validation. For more information on how to use registry scripts, see Microsoft Knowledge Base Article 310516.

Note See Microsoft Knowledge Base Article 2501584 to use the automated Microsoft Fix it solution to enable or disable this workaround in the appropriate Office software.

Note Modifying the Registry incorrectly can cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that problems resulting from incorrect modification of the Registry can be solved. Modify the Registry at your own risk.

Use the registry script that is appropriate for your Office software.

Microsoft Office Software	Registry Script
Microsoft Excel 2003	Windows Registry Editor Version 5.00\ \ [HKEY_CURRENT_USER\Software\Microsoft\Office\11.0\Excel\Security\FileValidation]\ \ "InvalidFileUIOptions"=dword:00000001
Microsoft Excel 2007	Windows Registry Editor Version 5.00\ \ [HKEY_CURRENT_USER\Software\Microsoft\Office\12.0\Excel\Security\FileValidation]\ \ "InvalidFileUIOptions"=dword:00000001

Impact of workaround. Office File Validation will no longer allow the opening of suspicious files.

How to undo the workaround.

Use the appropriate registry script for your software to undo the settings set by this workaround.

Microsoft Office Software	Registry Script
Microsoft Excel 2003	Windows Registry Editor Version 5.00\ \ [HKEY_CURRENT_USER\Software\Microsoft\Office\11.0\Excel\Security\FileValidation]\ \ "InvalidFileUIOptions"=dword:00000000
Microsoft Excel 2007	Windows Registry Editor Version 5.00\ \ [HKEY_CURRENT_USER\Software\Microsoft\Office\12.0\Excel\Security\FileValidation]\ \ "InvalidFileUIOptions"=dword:00000000

Set Office File Validation to disable the edit in Protected View of files that fail validation in Excel 2010
The following registry scripts can be saved in registry entry (.reg) files and used to disable editing of files that fail file validation. For more information on how to use registry scripts, see Microsoft Knowledge Base Article 310516.

Note See Microsoft Knowledge Base Article 2501584 to use the automated Microsoft Fix it solution to enable or disable this workaround in the appropriate Office software.

Note Modifying the Registry incorrectly can cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that problems resulting from incorrect modification of the Registry can be solved. Modify the Registry at your own risk.

Use the registry script that is appropriate for your Office software.

Microsoft Office Software	Registry Script
Microsoft Excel 2010	Windows Registry Editor Version 5.00\ \ [HKEY_CURRENT_USER\Software\Microsoft\Office\14.0\Excel\Security\FileValidation]\ \ "DisableEditFromPV"=dword:00000001

Impact of workaround. Office File Validation will no longer allow the editing of suspicious files.

How to undo the workaround.

Use the appropriate registry script for your software to undo the settings set by this workaround.

Microsoft Office Software	Registry Script
Microsoft Excel 2010	Windows Registry Editor Version 5.00\ \ [HKEY_CURRENT_USER\Software\Microsoft\Office\14.0\Excel\Security\FileValidation]\ \ "DisableEditFromPV"=dword:00000000

Use Microsoft Office File Block policy to block the opening of Office 2003 and earlier documents from unknown or untrusted sources and locations
Microsoft Office File Block policy can be used to block specific file format types from opening in Microsoft Word, Microsoft Excel, and Microsoft PowerPoint.

For Microsoft Office 2007

The following registry scripts can be saved in registry entry (.reg) files and used to set the File Block policy. For more information on how to use registry scripts, see Microsoft Knowledge Base Article 310516.

Note In order to use 'FileOpenBlock' with Microsoft Office 2007, all of the latest security updates for Office 2007 must be applied.

Microsoft Office Software	Registry Script
Microsoft Excel 2007	Windows Registry Editor Version 5.00\ \ [HKEY_CURRENT_USER\Software\Policies\Microsoft\Office\12.0\Excel\Security\FileOpenBlock]\ \ "BinaryFiles"=dword:00000001

For Microsoft Office 2010

Open Microsoft Excel 2010 and perform the following steps:

Click the File tab.
Under Help, click Options.
Click Trust Center, and then click Trust Center Settings.
In the Trust Center, click File Block Settings.
Ensure the Open check box is selected for the following file types: In Microsoft Excel 2010:
- Excel 2007 and later Binary Workbooks
- Excel 97-2003 Add-in Files
- Excel 97-2003 Workbooks and Templates
- Excel 95-97 Workbooks and Templates
- Excel 95 Workbooks
- Excel 4 Workbooks
- Excel 4 Worksheets
- Excel 3 Worksheets
- Excel 2 Worksheets
Under Open behavior for selected file types, select Do not open selected file types or select Open selected file types in Protected View. Either choice will block the attack vector to the vulnerable code.
Click OK to apply the File Block Settings.

Alternatively, file block can be applied using Group Policy. For more information, see the TechNet article, [Plan file block settings for Office 2010](https://technet.microsoft.com/library/cc179230.aspx).

Impact of workaround. For Microsoft Office 2007, users who have configured the File Block policy and have not configured a special exempt directory or have not moved files to a trusted location will be unable to open Office 2003 files or earlier versions. For Microsoft Office 2010, Office 2003 files or earlier versions will either be blocked from opening or will be opened in protected mode depending on the open behavior that was selected. For more information about the impact of file block setting in Microsoft Office software, see Microsoft Knowledge Base Article 922850.

How to undo the workaround.

For Microsoft Office 2007, use the following registry scripts to undo the settings used to set the File Block policy:

Microsoft Office Software	Registry Script
Microsoft Excel 2007	Windows Registry Editor Version 5.00\ \ [HKEY_CURRENT_USER\Software\Policies\Microsoft\Office\12.0\Excel\Security\FileOpenBlock]\ \ "BinaryFiles"=dword:00000000

For Microsoft Office 2010, open Microsoft Excel 2010 and perform the following steps:

Click the File tab.
Under Help, click Options.
Click Trust Center, and then click Trust Center Settings.
In the Trust Center, click File Block Settings.
Clear the Open check box for the file types that you previously selected.
Click OK to apply the File Block settings.

Use the Microsoft Office Isolated Conversion Environment (MOICE) when opening files from unknown or untrusted sources
Note Modifying the Registry incorrectly can cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that problems resulting from incorrect modification of the Registry can be solved. Modify the Registry at your own risk.

The Microsoft Office Isolated Conversion Environment (MOICE) helps protect Office 2003 installations by more securely opening Word, Excel, and PowerPoint binary format files.

To install MOICE, you must have Office 2003 or Office 2007 installed.

To install MOICE, you must also have the Compatibility Pack for Word, Excel, and PowerPoint 2007 File Formats. The compatibility pack is available as a free download from the Microsoft Download Center.

MOICE requires all updates that are recommended for all Office programs. Visit Microsoft Update to install all recommended updates.

Enable MOICE

Note See Microsoft Knowledge Base Article 935865 to use the automated Microsoft Fix it solution to enable or disable this workaround.

To manually enable MOICE, run the commands as specified in the following table. Running the commands will associate the Office application extensions with MOICE.

Command to enable MOICE to be the registered handler
For Word, run the following command from a command prompt:\ ASSOC .doc=oice.word.document
For Excel, run the following commands from a command prompt:\ ASSOC .XLS=oice.excel.sheet\ ASSOC .XLT=oice.excel.template\ ASSOC .XLA=oice.excel.addin
For PowerPoint, run the following commands from a command prompt:\ ASSOC .PPT=oice.powerpoint.show\ ASSOC .POT=oice.powerpoint.template\ ASSOC .PPS=oice.powerpoint.slideshow

Note On Windows Vista, Windows Server 2008, Windows 7, and Windows Server 2008 R2, run the above commands from an elevated command prompt.

For more information on MOICE, see Microsoft Knowledge Base Article 935865.

How to undo the workaround. Run the commands to disable MOICE as specified in the table below.

Command to disable MOICE as the registered handler
For Word, run the following command from a command prompt:\ ASSOC .doc=Word.Document.8
For Excel, run the following commands from a command prompt:\ ASSOC .xls=Excel.Sheet.8\ ASSOC .xlt=Excel.Template\ ASSOC .xla=Excel.Addin
For PowerPoint, run the following commands from a command prompt:\ ASSOC .ppt=PowerPoint.Show.8\ ASSOC .pot=PowerPoint.Template.8\ ASSOC .pps=PowerPoint.SlideShow.8

Note On Windows Vista, Windows Server 2008, Windows 7, and Windows Server 2008 R2, run the above commands from an elevated command prompt.

Do not open Excel files that you receive from untrusted sources or that you receive unexpectedly from trusted sources
Do not open or save Microsoft Excel files that you receive from untrusted sources or that you receive unexpectedly from trusted sources. This vulnerability could be exploited when a user opens a specially crafted file.

FAQ for Excel Stack Overflow Vulnerability - CVE-2012-2543

What is the scope of the vulnerability?
This is a remote code execution vulnerability.

What causes the vulnerability?
The vulnerability is caused when Microsoft Excel encounters a modified data structure while parsing a specially crafted Excel file, corrupting system memory in such a way that an attacker could execute arbitrary code.

How could an attacker exploit the vulnerability?
This vulnerability requires that a user open a specially crafted Excel file with an affected version of Microsoft Excel.

In an email attack scenario, an attacker could exploit the vulnerability by sending a specially crafted Excel file to the user and by convincing the user to open the file.

What does the update do?
The update addresses the vulnerability by modifying the way that Microsoft Excel validates the vulnerable data structures.

When this security bulletin was issued, had this vulnerability been publicly disclosed?
No. Microsoft received information about this vulnerability through coordinated vulnerability disclosure.

Update Information

Detection and Deployment Tools and Guidance

Security Central

Manage the software and security updates you need to deploy to the servers, desktop, and mobile systems in your organization. For more information see the TechNet Update Management Center. The Microsoft TechNet Security website provides additional information about security in Microsoft products.

Security updates are available from Microsoft Update and Windows Update. Security updates are also available from the Microsoft Download Center. You can find them most easily by doing a keyword search for "security update."

For customers of Microsoft Office for Mac, Microsoft AutoUpdate for Mac can help keep your Microsoft software up to date. For more information about using Microsoft AutoUpdate for Mac, see Check for software updates automatically.

Finally, security updates can be downloaded from the Microsoft Update Catalog. The Microsoft Update Catalog provides a searchable catalog of content made available through Windows Update and Microsoft Update, including security updates, drivers and service packs. By searching using the security bulletin number (such as, "MS12-001"), you can add all the applicable updates to your basket (including different languages for an update), and download to the folder of your choosing. For more information about the Microsoft Update Catalog, see the Microsoft Update Catalog FAQ.

Detection and Deployment Guidance

Microsoft provides detection and deployment guidance for security updates. This guidance contains recommendations and information that can help IT professionals understand how to use various tools for detection and deployment of security updates. For more information, see Microsoft Knowledge Base Article 961747.

Microsoft Baseline Security Analyzer

Microsoft Baseline Security Analyzer (MBSA) lets administrators scan local and remote systems for missing security updates as well as common security misconfigurations. For more information, see Microsoft Baseline Security Analyzer.

The following table provides the MBSA detection summary for this security update.

Software	MBSA
Microsoft Office 2003 Service Pack 3	Yes
Microsoft Office 2007 Service Pack 2 and Microsoft Office 2007 Service Pack 3	Yes
Microsoft Office 2010 Service Pack 1 (32-bit editions)	Yes
Microsoft Office 2010 Service Pack 1 (64-bit editions)	Yes
Microsoft Office 2008 for Mac	No
Microsoft Office for Mac 2011	No
Microsoft Excel Viewer	Yes
Microsoft Office Compatibility Pack Service Pack 2	Yes
Microsoft Office Compatibility Pack Service Pack 3	Yes

Note For customers using legacy software not supported by the latest release of MBSA, Microsoft Update, and Windows Server Update Services, please see Microsoft Baseline Security Analyzer and reference the Legacy Product Support section on how to create comprehensive security update detection with legacy tools.

Windows Server Update Services

Windows Server Update Services (WSUS) enables information technology administrators to deploy the latest Microsoft product updates to computers that are running the Windows operating system. For more information about how to deploy security updates using Windows Server Update Services, see the TechNet article, Windows Server Update Services.

Systems Management Server

The following table provides the SMS detection and deployment summary for this security update.

Software	SMS 2003 with ITMU	System Center Configuration Manager
Microsoft Office 2003 Service Pack 3	Yes	Yes
Microsoft Office 2007 Service Pack 2 and Microsoft Office 2007 Service Pack 3	Yes	Yes
Microsoft Office 2010 Service Pack 1 (32-bit editions)	Yes	Yes
Microsoft Office 2010 Service Pack 1 (64-bit editions)	Yes	Yes
Microsoft Office 2008 for Mac	No	No
Microsoft Office for Mac 2011	No	No
Microsoft Excel Viewer	Yes	Yes
Microsoft Office Compatibility Pack Service Pack 2	Yes	Yes
Microsoft Office Compatibility Pack Service Pack 3	Yes	Yes

Note Microsoft discontinued support for SMS 2.0 on April 12, 2011. For SMS 2003, Microsoft also discontinued support for the Security Update Inventory Tool (SUIT) on April 12, 2011. Customers are encouraged to upgrade to System Center Configuration Manager. For customers remaining on SMS 2003 Service Pack 3, the Inventory Tool for Microsoft Updates (ITMU) is also an option.

For SMS 2003, the SMS 2003 Inventory Tool for Microsoft Updates (ITMU) can be used by SMS to detect security updates that are offered by Microsoft Update and that are supported by Windows Server Update Services. For more information about the SMS 2003 ITMU, see SMS 2003 Inventory Tool for Microsoft Updates. For more information about SMS scanning tools, see SMS 2003 Software Update Scanning Tools. See also Downloads for Systems Management Server 2003.

System Center Configuration Manager uses WSUS 3.0 for detection of updates. For more information, see System Center.

For more detailed information, see Microsoft Knowledge Base Article 910723: Summary list of monthly detection and deployment guidance articles.

Note If you have used an Administrative Installation Point (AIP) for deploying Office 2003, you may not be able to deploy the update using SMS if you have updated the AIP from the original baseline. For more information, see the Office Administrative Installation Point heading in this section.

Office Administrative Installation Point

If you installed your application from a server location, the server administrator must update the server location with the administrative update and deploy that update to your system.

For supported versions of Microsoft Office 2003, see Creating an Administrative Installation Point. For more information on how to change the source for a client computer from an updated administrative installation point to an Office 2003 original baseline source or Service Pack 3 (SP3), see Microsoft Knowledge Base Article 902349.
Note If you plan to manage software updates centrally from an updated administrative image, you can find more information in the article, Distributing Office 2003 Product Updates.
For creating a network installation point for supported versions of Microsoft Office, see Create a network installation point for Microsoft Office.
Note If you plan to manage security updates centrally, use Windows Server Update Services. For more information about how to deploy security updates for Microsoft Office, see the Windows Server Update Services website.

Update Compatibility Evaluator and Application Compatibility Toolkit

Updates often write to the same files and registry settings required for your applications to run. This can trigger incompatibilities and increase the time it takes to deploy security updates. You can streamline testing and validating Windows updates against installed applications with the Update Compatibility Evaluator components included with Application Compatibility Toolkit.

The Application Compatibility Toolkit (ACT) contains the necessary tools and documentation to evaluate and mitigate application compatibility issues before deploying Windows Vista, a Windows Update, a Microsoft Security Update, or a new version of Windows Internet Explorer in your environment.

Security Update Deployment

Affected Software

For information about the specific security update for your affected software, click the appropriate link:

Excel 2003 (all editions)

Reference Table

The following table contains the security update information for this software. You can find additional information in the Deployment Information subsection below.

Inclusion in Future Service Packs	There are no more service packs planned for this software. The update for this issue may be included in a future update rollup.
Deployment
Installing without user intervention	office2003-kb2687481-fullfile-enu.exe /q:a
Installing without restarting	office2003-kb2687481-fullfile-enu.exe /r:n
Update log file	Not applicable
Further information	For detection and deployment, see the earlier section, Detection and Deployment Tools and Guidance. \ \ For features you can selectively install, see the Office Features for Administrative Installations subsection in this section.
Restart Requirement
Restart required?	In some cases, this update does not require a restart. If the required files are being used, this update will require a restart. If this behavior occurs, a message appears that advises you to restart.\ \ To help reduce the chance that a restart will be required, stop all affected services and close all applications that may use the affected files prior to installing the security update. For more information about the reasons why you may be prompted to restart, see Microsoft Knowledge Base Article 887012.
HotPatching	Not applicable
Removal Information	Use Add or Remove Programs item in Control Panel.\ \ Note When you remove this update, you may be prompted to insert the Microsoft Office 2003 CD in the CD drive. Additionally, you may not have the option to uninstall the update from the Add or Remove Programs item in Control Panel. There are several possible causes for this issue. For more information about the removal, see Microsoft Knowledge Base Article 903771.
File Information	See Microsoft Knowledge Base Article 2687481
Registry Key Verification	Not applicable

Office Features

The following table contains the list of feature names (case sensitive) that must be reinstalled for the update. To install all features, you can use REINSTALL=ALL or you can install the following features:

Product	Feature
STD11, BASIC11, PERS11, STDP11, PROI11, PRO11, PRO11SB	ALL

Note Administrators working in managed environments can find complete resources for deploying Office updates in an organization at the Office Admin Update Center. At that site, scroll down and look under the Update Resources section for the software version you are updating. The Windows Installer Documentation also provides more information about the parameters supported by Windows Installer.

Deployment Information

Installing the Update

You can install the update from the appropriate download link in the Affected and Non-Affected Software section. If you installed your application from a server location, the server administrator must instead update the server location with the administrative update and deploy that update to your system. For more information about Administrative Installation Points, refer to the Office Administrative Installation Point information in the Detection and deployment Tools and Guidance subsection.

This security update requires that Windows Installer 2.0 or later version be installed on the system. All supported versions of Windows include Windows Installer 2.0 or a later version.

To install the 2.0 or later version of Windows Installer, see one of the following Microsoft websites:

For more information about the terminology that appears in this bulletin, such as hotfix, see Microsoft Knowledge Base Article 824684.

This security update supports the following setup switches.

Supported Security Update Installation Switches

Switch	Description
/q	Specifies quiet mode, or suppresses prompts, when files are being extracted.
/q:u	Specifies user-quiet mode, which presents some dialog boxes to the user.
/q:a	Specifies administrator-quiet mode, which does not present any dialog boxes to the user.
/t:path	Specifies the target folder for extracting files.
/c	Extracts the files without installing them. If /t:path is not specified, you are prompted for a target folder.
/c:path	Overrides the install command that is defined by author. Specifies the path and name of the Setup.inf or .exe file.
/r:n	Never restarts the system after installation.
/r:I	Prompts the user to restart the system if a restart is required, except when used with /q:a.
/r:a	Always restarts the system after installation.
/r:s	Restarts the system after installation without prompting the user.
/n:v	No version checking - Install the program over any earlier version.

Note You can combine these switches into one command. For backward compatibility, the security update also supports many of the setup switches that the earlier version of the Setup program uses. For more information about the supported installation switches, see Microsoft Knowledge Base Article 262841.

Removing the Update

To remove this security update, use the Add or Remove Programs item in Control Panel.

Note When you remove this update, you may be prompted to insert the Microsoft Office 2003 CD in the CD drive. Additionally, you may not have the option to uninstall the update from the Add or Remove Programs item in Control Panel. There are several possible causes for this issue. For more information about the removal, see Microsoft Knowledge Base Article 903771.

Verifying that the Update Has Been Applied

Microsoft Baseline Security Analyzer
To verify that a security update has been applied to an affected system, you may be able to use the Microsoft Baseline Security Analyzer (MBSA) tool. See the section, Detection and Deployment Tools and Guidance, earlier in this bulletin for more information.
File Version Verification
Because there are several editions of Microsoft Windows, the following steps may be different on your system. If they are, see your product documentation to complete these steps.
1. Click Start and then enter an update file name in the Start Search box.
2. When the file appears under Programs, right-click the file name and click Properties.
3. On the General tab, compare the file size with the file information tables provided in the bulletin KB article.
4. You can also click the Details tab and compare information, such as file version and date modified, with the file information tables provided in the bulletin KB article.
5. Finally, you can also click the Previous Versions tab and compare file information for the previous version of the file with the file information for the new, or updated, version of the file.

Microsoft Excel 2007 (all editions)

Reference Table

The following table contains the security update information for this software. You can find additional information in the subsection, Deployment Information, in this section.

Inclusion in Future Service Packs	The update for this issue will be included in a future service pack or update rollup
Deployment
Installing without user intervention	For Microsoft Excel 2007:\ excel2007-kb2687307-fullfile-x86-glb.exe /passive
For Microsoft Excel Viewer:\ xlview2007-kb2687313-fullfile-x86-glb.exe /passive
For Microsoft Office Compatibility Pack:\ xlconv2007-kb2687311-fullfile-x86-glb.exe /passive
Installing without restarting	For Microsoft Excel 2007:\ excel2007-kb2687307-fullfile-x86-glb.exe /norestart
For Microsoft Excel Viewer:\ xlview2007-kb2687313-fullfile-x86-glb.exe /norestart
For Microsoft Office Compatibility Pack:\ xlconv2007-kb2687311-fullfile-x86-glb.exe /norestart
Update log file	Not applicable
Further information	For detection and deployment, see the earlier section, Detection and Deployment Tools and Guidance.
Restart Requirement
Restart required?	In some cases, this update does not require a restart. If the required files are being used, this update will require a restart. If this behavior occurs, a message appears that advises you to restart.\ \ To help reduce the chance that a restart will be required, stop all affected services and close all applications that may use the affected files prior to installing the security update. For more information about the reasons why you may be prompted to restart, see Microsoft Knowledge Base Article 887012.
HotPatching	Not applicable
Removal Information	Use Add or Remove Programs item in Control Panel.
File Information	See Microsoft Knowledge Base Article 2687307\ See Microsoft Knowledge Base Article 2687313\ See Microsoft Knowledge Base Article 2687311
Registry Key Verification	Not applicable

Deployment Information

Installing the Update

This security update requires that Windows Installer 3.1 or later version be installed on the system.

To install the 3.1 or later version of Windows Installer, see one of the following Microsoft websites:

For more information about the terminology that appears in this bulletin, such as hotfix, see Microsoft Knowledge Base Article 824684.

This security update supports the following setup switches.

Supported Security Update Installation Switches

Switch	Description
/? or /help	Displays usage dialog.
/passive	Specifies passive mode. Requires no user interaction; users see basic progress dialogs but cannot cancel.
/quiet	Specifies quiet mode, or suppresses prompts, when files are being extracted.
/norestart	Suppresses restarting the system if the update requires a restart.
/forcerestart	Automatically restarts the system after applying the update, regardless of whether the update requires the restart.
/extract	Extracts the files without installing them. You are prompted for a target folder.
/extract:<path>	Overrides the install command that is defined by author. Specifies the path and name of the Setup.inf or .exe file.
/lang:<LCID>	Forces the use of a specific language, when the update package supports that language.
/log:<log file>	Enables logging, by both Vnox and Installer, during the update installation.

Removing the Update

To remove this security update, use the Add or Remove Programs item in Control Panel.

Note When you remove this update, you may be prompted to insert the 2007 Microsoft Office CD in the CD drive. Additionally, you may not have the option to uninstall the update from the Add or Remove Programs item in Control Panel. There are several possible causes for this issue. For more information about the removal, see Microsoft Knowledge Base Article 903771.

Verifying that the Update Has Been Applied

Microsoft Baseline Security Analyzer
To verify that a security update has been applied to an affected system, you may be able to use the Microsoft Baseline Security Analyzer (MBSA) tool. See the section, Detection and Deployment Tools and Guidance, earlier in this bulletin for more information.
File Version Verification
Because there are several editions of Microsoft Windows, the following steps may be different on your system. If they are, see your product documentation to complete these steps.
1. Click Start and then enter an update file name in the Start Search box.
2. When the file appears under Programs, right-click the file name and click Properties.
3. On the General tab, compare the file size with the file information tables provided in the bulletin KB article.
  Note Depending on the edition of the operating system, or the programs that are installed on your system, some files that are listed in the file information table may not be installed.
4. You can also click the Details tab and compare information, such as file version and date modified, with the file information tables provided in the bulletin KB article.
  Note Attributes other than the file version may change during installation. Comparing other file attributes to the information in the file information table is not a supported method of verifying that the update has been applied. Also, in certain cases, files may be renamed during installation. If the file or version information is not present, use one of the other available methods to verify update installation.
5. Finally, you can also click the Previous Versions tab and compare file information for the previous version of the file with the file information for the new, or updated, version of the file.

Microsoft Excel 2010 (all editions)

Reference Table

The following table contains the security update information for this software. You can find additional information in the subsection, Deployment Information, in this section.

Inclusion in Future Service Packs	The update for this issue will be included in a future service pack or update rollup
Deployment
Installing without user intervention	For Microsoft Excel 2010 (32-bit editions):\ excel2010-kb2597126-fullfile-x86-glb.exe /passive
For Microsoft Excel 2010 (64-bit editions):\ excel2010-kb2597126-fullfile-x64-glb.exe /passive
Installing without restarting	For Microsoft Excel 2010 (32-bit editions):\ excel2010-kb2597126-fullfile-x86-glb.exe /norestart
For Microsoft Excel 2010 (64-bit editions):\ excel2010-kb2597126-fullfile-x64-glb.exe /norestart
Update log file	Not applicable
Further information	For detection and deployment, see the earlier section, Detection and Deployment Tools and Guidance.
Restart Requirement
Restart required?	In some cases, this update does not require a restart. If the required files are being used, this update will require a restart. If this behavior occurs, a message appears that advises you to restart.\ \ To help reduce the chance that a restart will be required, stop all affected services and close all applications that may use the affected files prior to installing the security update. For more information about the reasons why you may be prompted to restart, see Microsoft Knowledge Base Article 887012.
HotPatching	Not applicable
Removal Information	Use Add or Remove Programs item in Control Panel.
File Information	See Microsoft Knowledge Base Article 2597126
Registry Key Verification	Not applicable

Deployment Information

Installing the Update

This security update requires that Windows Installer 3.1 or later version be installed on the system.

To install the 3.1 or later version of Windows Installer, see one of the following Microsoft websites:

For more information about the terminology that appears in this bulletin, such as hotfix, see Microsoft Knowledge Base Article 824684.

This security update supports the following setup switches.

Supported Security Update Installation Switches

Switch	Description
/? or /help	Displays usage dialog.
/passive	Specifies passive mode. Requires no user interaction; users see basic progress dialogs but cannot cancel.
/quiet	Specifies quiet mode, or suppresses prompts, when files are being extracted.
/norestart	Suppresses restarting the system if the update requires a restart.
/forcerestart	Automatically restarts the system after applying the update, regardless of whether the update requires the restart.
/extract	Extracts the files without installing them. You are prompted for a target folder.
/extract:<path>	Overrides the install command that is defined by author. Specifies the path and name of the Setup.inf or .exe file.
/lang:<LCID>	Forces the use of a specific language, when the update package supports that language.
/log:<log file>	Enables logging, by both Vnox and Installer, during the update installation.

Removing the Update

To remove this security update, use the Add or Remove Programs item in Control Panel.

Verifying that the Update Has Been Applied

Microsoft Baseline Security Analyzer
To verify that a security update has been applied to an affected system, you may be able to use the Microsoft Baseline Security Analyzer (MBSA) tool. See the section, Detection and Deployment Tools and Guidance, earlier in this bulletin for more information.
File Version Verification
Because there are several editions of Microsoft Windows, the following steps may be different on your system. If they are, see your product documentation to complete these steps.
1. Click Start and then enter an update file name in the Start Search box.
2. When the file appears under Programs, right-click the file name and click Properties.
3. On the General tab, compare the file size with the file information tables provided in the bulletin KB article.
  Note Depending on the edition of the operating system, or the programs that are installed on your system, some files that are listed in the file information table may not be installed.
4. You can also click the Details tab and compare information, such as file version and date modified, with the file information tables provided in the bulletin KB article.
  Note Attributes other than the file version may change during installation. Comparing other file attributes to the information in the file information table is not a supported method of verifying that the update has been applied. Also, in certain cases, files may be renamed during installation. If the file or version information is not present, use one of the other available methods to verify update installation.
5. Finally, you can also click the Previous Versions tab and compare file information for the previous version of the file with the file information for the new, or updated, version of the file.

Office 2008 for Mac

Deployment Information

Prerequisites

Mac OS X version 10.4.9 or later version on an Intel, PowerPC G5, or PowerPC G4 (500 MHz or faster) processor
Mac OS X user accounts must have administrator privileges to install this security update

Installing the Update

Download and install the appropriate language version of the Microsoft Office 2008 for Mac 12.3.5 Update from the Microsoft Download Center.

Quit any applications that are running, including virus-protection applications, all Microsoft Office applications, Microsoft Messenger for Mac, and Office Notifications, because they might interfere with installation.
Open the Microsoft Office 2008 for Mac 12.3.5 Update volume on your desktop. This step might have been performed for you.
To start the update process, in the Microsoft Office 2008 for Mac 12.3.5 Update volume window, double-click the Microsoft Office 2008 for Mac 12.3.5 Update application, and follow the instructions on the screen.
If the installation finishes successfully, you can remove the update installer from your hard disk. To verify that the installation finished successfully, see the following "Verifying Update Installation" heading. To remove the update installer, first drag the Microsoft Office 2008 for Mac 12.3.5 Update volume to the Trash, and then drag the file that you downloaded to the Trash.

Verifying Update Installation

To verify that a security update is installed on an affected system, follow these steps:

In the Finder, navigate to the Application Folder (Microsoft Office 2008: Office).
Select the file, Microsoft Component Plugin.
On the File menu, click Get Info or Show Info.

If the Version number is 12.3.5, the update has been successfully installed.

Restart Requirement

This update does not require you to restart your computer.

Removing the Update

This security update cannot be uninstalled.

Additional Information

If you have technical questions or problems downloading or using this update, see Microsoft for Mac Support to learn about the support options that are available to you.

Office for Mac 2011

Deployment Information

Prerequisites

Mac OS X version 10.5.8 or later version on an Intel processor
Mac OS X user accounts must have administrator privileges to install this security update

Installing the Update

Download and install the appropriate language version of the Microsoft Office for Mac 2011 14.2.5 Update from the Microsoft Download Center.

Quit any applications that are running, including virus-protection applications and all Microsoft Office applications, because they might interfere with installation.
Open the Microsoft Office for Mac 2011 14.2.5 Update volume on your desktop. This step might have been performed for you.
To start the update process, in the Microsoft Office for Mac 2011 14.2.5 Update volume window, double-click the Microsoft Office for Mac 2011 14.2.5 Update application, and follow the instructions on the screen.
When the installation finishes successfully, you can remove the update installer from your hard disk. To verify that the installation finished successfully, see the following "Verifying Update Installation" heading. To remove the update installer, first drag the Microsoft Office for Mac 2011 14.2.5 Update volume to the Trash, and then drag the file that you downloaded to the Trash.

Verifying Update Installation

To verify that a security update is installed on an affected system, follow these steps:

In the Finder, navigate to the Application Folder (Microsoft Office 2011).
Select Word, Excel, PowerPoint, or Outlook and launch the application.
On the Application menu, click About Application_Name (where Application_Name is Word, Excel, PowerPoint or Outlook).

If the Latest Installed Update Version number is 14.2.5, the update has been successfully installed.

Restart Requirement

This update does not require you to restart your computer.

Removing the Update

This security update cannot be uninstalled.

Additional Information

If you have technical questions or problems downloading or using this update, see Microsoft for Mac Support to learn about the support options that are available to you.

Other Information

Acknowledgments

Microsoft thanks the following for working with us to help protect customers:

Sean Larsson, working with the iDefense VCP, for reporting the Excel SerAuxErrBar Heap Overflow Vulnerability (CVE-2012-1885)
An anonymous researcher, working with the iDefense VCP, for reporting the Excel Memory Corruption Vulnerability (CVE-2012-1886)
An anonymous researcher, working with the iDefense VCP, for reporting the Excel SST Invalid Length Use After Free Vulnerability (CVE-2012-1887)
An anonymous researcher, working with HP TippingPoint's Zero Day Initiative, for reporting the Stack Overflow from FEAT record Vulnerability (CVE-2012-2543)

Microsoft Active Protections Program (MAPP)

To improve security protections for customers, Microsoft provides vulnerability information to major security software providers in advance of each monthly security update release. Security software providers can then use this vulnerability information to provide updated protections to customers via their security software or devices, such as antivirus, network-based intrusion detection systems, or host-based intrusion prevention systems. To determine whether active protections are available from security software providers, please go to the active protections websites provided by program partners, listed in Microsoft Active Protections Program (MAPP) Partners.

Support

How to obtain help and support for this security update

Help installing updates: Support for Microsoft Update
Security solutions for IT professionals: TechNet Security Troubleshooting and Support
Help protect your computer that is running Windows from viruses and malware: Virus Solution and Security Center
Local support according to your country: International Support

Disclaimer

The information provided in the Microsoft Knowledge Base is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.

Revisions

V1.0 (November 13, 2012): Bulletin published.

Built at 2014-04-18T13:49:36Z-07:00

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Microsoft Security Bulletin MS12-076 - Important

Vulnerabilities in Microsoft Excel Could Allow Remote Code Execution (2720184)

General Information

Executive Summary

Affected and Non-Affected Software

Frequently Asked Questions (FAQ) Related to This Security Update

Vulnerability Information

Severity Ratings and Vulnerability Identifiers

Excel SerAuxErrBar Heap Overflow Vulnerability - CVE-2012-1885

Mitigating Factors for Excel SerAuxErrBar Heap Overflow Vulnerability - CVE-2012-1885

Workarounds for Excel SerAuxErrBar Heap Overflow Vulnerability - CVE-2012-1885

FAQ for Excel SerAuxErrBar Heap Overflow Vulnerability - CVE-2012-1885

Excel Memory Corruption Vulnerability - CVE-2012-1886

Mitigating Factors for Excel Memory Corruption Vulnerability - CVE-2012-1886

Workarounds for Excel Memory Corruption Vulnerability - CVE-2012-1886

FAQ for Excel Memory Corruption Vulnerability - CVE-2012-1886

Excel SST Invalid Length Use After Free Vulnerability - CVE-2012-1887

Mitigating Factors for Excel SST Invalid Length Use After Free Vulnerability - CVE-2012-1887

Workarounds for Excel SST Invalid Length Use After Free Vulnerability - CVE-2012-1887

FAQ for Excel SST Invalid Length Use After Free Vulnerability - CVE-2012-1887

Excel Stack Overflow Vulnerability - CVE-2012-2543

Mitigating Factors for Excel Stack Overflow Vulnerability - CVE-2012-2543

Workarounds for Excel Stack Overflow Vulnerability - CVE-2012-2543

FAQ for Excel Stack Overflow Vulnerability - CVE-2012-2543

Update Information

Detection and Deployment Tools and Guidance

Security Update Deployment

Excel 2003 (all editions)

Office Features

Deployment Information

Microsoft Excel 2007 (all editions)

Deployment Information

Microsoft Excel 2010 (all editions)

Deployment Information

Office 2008 for Mac

Deployment Information

Office for Mac 2011

Deployment Information

Other Information

Acknowledgments

Microsoft Active Protections Program (MAPP)

Support

Disclaimer

Revisions

Additional resources