Microsoft Security Bulletin MS15-001 - Important

Vulnerability in Windows Application Compatibility Cache Could Allow Elevation of Privilege (3023266)

Published: January 13, 2015

Version: 1.0

This security update resolves a publicly disclosed vulnerability in Microsoft Windows. The vulnerability could allow elevation of privilege if an attacker logs on to a system and runs a specially crafted application. An authenticated attacker who successfully exploited this vulnerability could bypass existing permission checks that are performed during cache modification in the Microsoft Windows Application Compatibility component and execute arbitrary code with elevated privileges.

This security update is rated Important for all supported editions of Windows 7, Windows Server 2008 R2, Windows 8, Windows Server 2012, Windows RT, Windows 8.1, Windows Server 2012 R2, and Windows RT 8.1. For more information, see the Affected Software section.

The security update addresses the vulnerability by changing how Windows Application Compatibility Infrastructure processes impersonation token usage. For more information about the vulnerability, see the Vulnerability Information section.

For more information about this update, see Microsoft Knowledge Base Article 3023266.

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.

Affected Software 

Operating System

Maximum Security Impact

Aggregate Severity Rating

Updates Replaced

Windows 7

Windows 7 for 32-bit Systems Service Pack 1
(3023266)

Elevation of Privilege

Important

2839229 in MS13-048

Windows 7 for x64-based Systems Service Pack 1
(3023266)

Elevation of Privilege

Important

2813170 in MS13-031

Windows Server 2008 R2

Windows Server 2008 R2 for x64-based Systems Service Pack 1
(3023266)

Elevation of Privilege

Important

2813170 in MS13-031

Windows Server 2008 R2 for Itanium-based Systems Service Pack 1
(3023266)

Elevation of Privilege

Important

2813170 in MS13-031

Windows 8 and Windows 8.1

Windows 8 for 32-bit Systems
(3023266)

Elevation of Privilege

Important

2859537 in MS13-063

Windows 8 for x64-based Systems
(3023266)

Elevation of Privilege

Important

2829361 in MS13-046

Windows 8.1 for 32-bit Systems
(3023266)

Elevation of Privilege

Important

None

Windows 8.1 for x64-based Systems
(3023266)

Elevation of Privilege

Important

None

Windows Server 2012 and Windows Server 2012 R2

Windows Server 2012
(3023266)

Elevation of Privilege

Important

2829361 in MS13-046

Windows Server 2012 R2
(3023266)

Elevation of Privilege

Important

None

Windows RT and Windows RT 8.1

Windows RT[1]
(3023266)

Elevation of Privilege

Important

2829361 in MS13-046

Windows RT 8.1[1]
(3023266)

Elevation of Privilege

Important

None

Server Core installation option

Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation)
(3023266)

Elevation of Privilege

Important

None

Windows Server 2012 (Server Core installation)
(3023266)

Elevation of Privilege

Important

None

Windows Server 2012 R2 (Server Core installation)
(3023266)

Elevation of Privilege

Important

None

[1]This update is available via Windows Update only.

 

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 January bulletin summary.

Vulnerability Severity Rating and Maximum Security Impact by Affected Software

Affected Software

Microsoft Application Compatibility Infrastructure Elevation of Privilege Vulnerability - CVE-2015-0002

Aggregate Severity Rating

Windows 7

Windows 7 for 32-bit Systems Service Pack 1
(3023266)

Important 
Elevation of Privilege

Important

Windows 7 for x64-based Systems Service Pack 1
(3023266)

Important 
Elevation of Privilege

Important

Windows Server 2008 R2

Windows Server 2008 R2 for x64-based Systems Service Pack 1
(3023266)

Important 
Elevation of Privilege

Important

Windows Server 2008 R2 for Itanium-based Systems Service Pack 1
(3023266)

Important 
Elevation of Privilege

Important

Windows 8 and Windows 8.1

Windows 8 for 32-bit Systems
(3023266)

Important 
Elevation of Privilege

Important

Windows 8 for x64-based Systems
(3023266)

Important 
Elevation of Privilege

Important

Windows 8.1 for 32-bit Systems
(3023266)

Important 
Elevation of Privilege

Important

Windows 8.1 for x64-based Systems
(3023266)

Important 
Elevation of Privilege

Important

Windows Server 2012 and Windows Server 2012 R2

Windows Server 2012
(3023266)

Important 
Elevation of Privilege

Important

Windows Server 2012 R2
(3023266)

Important 
Elevation of Privilege

Important

Windows RT and Windows RT 8.1

Windows RT
(3023266)

Important 
Elevation of Privilege

Important

Windows RT 8.1
(3023266)

Important 
Elevation of Privilege

Important

Server Core installation option

Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation)
(3023266)

Important 
Elevation of Privilege

Important

Windows Server 2012 (Server Core installation)
(3023266)

Important 
Elevation of Privilege

Important

Windows Server 2012 R2 (Server Core installation)
(3023266)

Important 
Elevation of Privilege

Important

Microsoft Application Compatibility Infrastructure Elevation of Privilege Vulnerability - CVE-2015-0002

An elevation of privilege vulnerability exists in how the Microsoft Windows Application Compatibility Infrastructure (AppCompat) improperly checks the authorization of the caller's impersonation token. An attacker could attempt to exploit this to run a privileged application. The update addresses the vulnerability by implementing proper authorization checking of impersonation token usage.

This vulnerability has been publicly disclosed. It has been assigned Common Vulnerability and Exposure number CVE-2015-0002. When this security bulletin was issued, Microsoft was not aware of attacks that attempt to exploit this vulnerability.

Mitigating Factors

Microsoft has not identified any mitigating factors for this vulnerability.

Workarounds

Microsoft has not identified any workarounds for this vulnerability. 

For Security Update Deployment information, see the Microsoft Knowledge Base article referenced here 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 (January 13, 2015): Bulletin published.

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