Microsoft Security Bulletin MS16-103 - Important

Security Update for ActiveSyncProvider (3182332)

Published: August 9, 2016

Version: 1.0

Executive Summary

This security update resolves a vulnerability in Microsoft Windows. The vulnerability could allow information disclosure when Universal Outlook fails to establish a secure connection.

This security update is rated Important for Windows 10 and Windows 10 Version 1511. For more information, see the Affected Softwareand Vulnerability Severity Ratings section.

The update addresses the vulnerability by preventing Universal Outlook from disclosing usernames and passwords. For more information about the vulnerability, see the Vulnerability Information section.

For more information about this update, see Microsoft Knowledge Base Article 3182332.

Affected Software and Vulnerability Severity Ratings

The following software versions or editions are affected. Versions or editions that are not listed 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.

The severity ratings indicated for each affected software 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 August bulletin summary.

|**Operating System**|[**Universal Outlook Information Disclosure Vulnerability - CVE-2016-3312**](|**Updates Replaced**\*| |------------|------------|------------| |**Windows 10**| |[Windows 10 for 32-bit Systems]([1](3176492)|**Important**  Information Disclosure|[3163912](| |[Windows 10 for x64-based Systems]([1](3176492)|**Important**  Information Disclosure|[3163912](| |[Windows 10 Version 1511 for 32-bit Systems]([1](3176493)|**Important**  Information Disclosure|[3172985](| |[Windows 10 Version 1511 for x64-based Systems]([1](3176493)|**Important**  Information Disclosure|[3172985](|

[1]Windows 10 updates are cumulative. The monthly security release includes all security fixes for vulnerabilities that affect Windows 10, in addition to non-security updates. The updates are available via the Microsoft Update Catalog.

Note The vulnerability discussed in this bulletin affects Windows Server 2016 Technical Preview 5. An update is available for Windows Server 2016 Technical Preview 5 via Windows Update. Microsoft recommends that customers running this operating system install the update.

*The Updates Replaced column shows only the latest update in any chain of superseded updates. For a comprehensive list of updates replaced, go to the Microsoft Update Catalog, search for the update KB number, and then view update details (updates replaced information is provided on the Package Details tab).

Vulnerability Information

Universal Outlook Information Disclosure Vulnerability - CVE-2016-3312

An information disclosure vulnerability exists when Universal Outlook fails to establish a secure connection. An attacker could use this vulnerability to obtain the username and password of a user. The update addresses the vulnerability by preventing Universal Outlook from disclosing usernames and passwords.

|**Vulnerability Title**|**CVE number**|**Publicly disclosed**|**Exploited**| |------------|------------|------------|------------| |Universal Outlook Information Disclosure Vulnerability|[CVE-2016-3312](|No|No|

Mitigating Factors

Microsoft has not identified any mitigating factors for this vulnerability.


Microsoft has not identified any workarounds for this vulnerability.

Security Update Deployment

For Security Update Deployment information, see the Microsoft Knowledge Base article referenced in the Executive Summary.


Microsoft recognizes the efforts of those in the security community who help us protect customers through coordinated vulnerability disclosure. See Acknowledgments for more information.


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.


  • V1.0 (August 9, 2016): Bulletin published.

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