Microsoft Security Bulletin MS17-004 - Important
Security Update for Local Security Authority Subsystem Service (3216771)
Published: January 10, 2017
Version: 1.0
Executive Summary
A denial of service vulnerability exists in the way the Local Security Authority Subsystem Service (LSASS) handles authentication requests. An attacker who successfully exploited the vulnerability could cause a denial of service on the target system's LSASS service, which triggers an automatic reboot of the system.
This security update is rated Important for Microsoft Windows Vista, Windows Server 2008, Windows 7, and Windows Server 2008 R2 (and Server Core). For more information, see the Affected Software and Vulnerability Severity Ratings section.
The security update addresses the vulnerability by changing the way that LSASS handles specially crafted authentication requests.
For more information about the vulnerability, see the Vulnerability Information section. For more information about this update, see Microsoft Knowledge Base Article 3216771.
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 past 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 January bulletin summary.
| Operating System | Local Security Authority Subsystem Service Denial of Service Vulnerability - CVE-2017-0004 | Updates Replaced* |
|---|---|---|
| Windows Vista | ||
| Windows Vista Service Pack 2 (3216775) | Important Denial of Service | 3204808 in MS16-149 |
| Windows Vista x64 Edition Service Pack 2 (3216775) | Important Denial of Service | 3204808 in MS16-149 |
| Windows Server 2008 | ||
| Windows Server 2008 for 32-bit Systems Service Pack 2 (3216775) | Important Denial of Service | 3204808 in MS16-149 |
| Windows Server 2008 for x64-based Systems Service Pack 2 (3216775) | Important Denial of Service | 3204808 in MS16-149 |
| Windows Server 2008 for Itanium-based Systems Service Pack 2 (3216775) | Important Denial of Service | 3204808 in MS16-149 |
| Windows 7 | ||
| Windows 7 for 32-bit Systems Service Pack 1 (3212642) Security Only[1] | Important Denial of Service | None |
| Windows 7 for 32-bit Systems Service Pack 1 (3212646) Monthly Rollup[1] | Important Denial of Service | 3207752 |
| Windows 7 for x64-based Systems Service Pack 1 (3212642) Security Only[1] | Important Denial of Service | None |
| Windows 7 for x64-based Systems Service Pack 1 (3212646) Monthly Rollup[1] | Important Denial of Service | 3207752 |
| Windows Server 2008 R2 | ||
| Windows Server 2008 R2 for x64-based Systems Service Pack 1 (3212642) Security Only[1] | Important Denial of Service | None |
| Windows Server 2008 R2 for x64-based Systems Service Pack 1 (3212646) Monthly Rollup[1] | Important Denial of Service | 3207752 |
| Windows Server 2008 R2 for Itanium-based Systems Service Pack 1 (3212642) Security Only[1] | Important Denial of Service | None |
| Windows Server 2008 R2 for Itanium-based Systems Service Pack 1 (3212646) Monthly Rollup[1] | Important Denial of Service | 3207752 |
| Server Core installation option | ||
| Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation) (3216775) | Important Denial of Service | 3204808 in MS16-149 |
| Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation) (3216775) | Important Denial of Service | 3204808 in MS16-149 |
| Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) (3212642) Security Only[1] | Important Denial of Service | None |
| Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) (3212646) Monthly Rollup[1] | Important Denial of Service | 3207752 |
[1]Beginning with the October 2016 release, Microsoft is changing the update servicing model for Windows 7, Windows Server 2008 R2, Windows 8.1, Windows Server 2012, and Windows Server 2012 R2. For more information, please see this Microsoft TechNet article.
*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 PackageDetails tab).
Vulnerability Information
Local Security Authority Subsystem Service Denial of Service Vulnerability - CVE-2017-0004
A denial of service vulnerability exists in the way the Local Security Authority Subsystem Service (LSASS) handles authentication requests. An attacker who successfully exploited the vulnerability could cause a denial of service on the target system's LSASS service, which triggers an automatic reboot of the system.
To exploit the vulnerability an unauthenticated attacker could send a specially crafted authentication request.
The security update addresses the vulnerability by changing the way that LSASS handles specially crafted authentication requests.
The following table contains links to the standard entry for each vulnerability in the Common Vulnerabilities and Exposures list:
| Vulnerability title | CVE number | Publicly disclosed | Exploited |
|---|---|---|---|
| Local Security Authority Subsystem Service Denial of Service Vulnerability | CVE-2017-0004 | Yes | No |
Mitigating Factors
Microsoft has not identified any mitigating factors for this vulnerability.
Workarounds
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.
Acknowledgments
Microsoft recognizes the efforts of those in the security community who help us protect customers through coordinated vulnerability disclosure. See Acknowledgments for more information.
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 (January 10, 2017): Bulletin published.
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