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Microsoft Security Bulletin MS12-055 - Important
Vulnerability in Windows Kernel-Mode Drivers Could Allow Elevation of Privilege (2731847)

Published: Tuesday, August 14, 2012

Version: 1.0
General Information
Executive Summary

This security update resolves one privately reported vulnerability in Microsoft Windows. The vulnerability could allow elevation of privilege if an attacker logs on to the system and runs a specially crafted application. An attacker must have valid logon credentials and be able to log on locally to exploit this vulnerability.

This security update is rated Important for all supported releases of Microsoft Windows. For more information, see the subsection, Affected and Non-Affected Software, in this section.

The security update addresses the vulnerabilities by correcting the way that the Windows kernel-mode driver handles objects in memory. For more information about the vulnerability, see the Frequently Asked Questions (FAQ) subsection for the specific vulnerability entry under the next section, Vulnerability Information.

Recommendation. Most customers have automatic updating enabled and 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 and install this update manually. For information about specific configuration options in automatic updating, see Microsoft Knowledge Base Article 294871.

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
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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 
Operating System	Maximum Security Impact	Aggregate Severity Rating	Updates Replaced
Windows XP Service Pack 3
(KB2731847)	Elevation of Privilege	Important	KB2718523 in MS12-047 replaced by KB2731847
Windows XP Professional x64 Edition Service Pack 2
(KB2731847)	Elevation of Privilege	Important	KB2718523 in MS12-047 replaced by KB2731847
Windows Server 2003 Service Pack 2
(KB2731847)	Elevation of Privilege	Important	KB2718523 in MS12-047 replaced by KB2731847
Windows Server 2003 x64 Edition Service Pack 2
(KB2731847)	Elevation of Privilege	Important	KB2718523 in MS12-047 replaced by KB2731847
Windows Server 2003 with SP2 for Itanium-based Systems
(KB2731847)	Elevation of Privilege	Important	KB2718523 in MS12-047 replaced by KB2731847
Windows Vista Service Pack 2
(KB2731847)	Elevation of Privilege	Important	KB2718523 in MS12-047 replaced by KB2731847
Windows Vista x64 Edition Service Pack 2
(KB2731847)	Elevation of Privilege	Important	KB2718523 in MS12-047 replaced by KB2731847
Windows Server 2008 for 32-bit Systems Service Pack 2
(KB2731847)	Elevation of Privilege	Important	KB2718523 in MS12-047 replaced by KB2731847
Windows Server 2008 for x64-based Systems Service Pack 2
(KB2731847)	Elevation of Privilege	Important	KB2718523 in MS12-047 replaced by KB2731847
Windows Server 2008 for Itanium-based Systems Service Pack 2
(KB2731847)	Elevation of Privilege	Important	KB2718523 in MS12-047 replaced by KB2731847
Windows 7 for 32-bit Systems
(KB2731847)	Elevation of Privilege	Important	KB2718523 in MS12-047 replaced by KB2731847
Windows 7 for 32-bit Systems Service Pack 1
(KB2731847)	Elevation of Privilege	Important	KB2718523 in MS12-047 replaced by KB2731847
Windows 7 for x64-based Systems
(KB2731847)	Elevation of Privilege	Important	KB2718523 in MS12-047 replaced by KB2731847
Windows 7 for x64-based Systems Service Pack 1
(KB2731847)	Elevation of Privilege	Important	KB2718523 in MS12-047 replaced by KB2731847
Windows Server 2008 R2 for x64-based Systems
(KB2731847)	Elevation of Privilege	Important	KB2718523 in MS12-047 replaced by KB2731847
Windows Server 2008 R2 for x64-based Systems Service Pack 1
(KB2731847)	Elevation of Privilege	Important	KB2718523 in MS12-047 replaced by KB2731847
Windows Server 2008 R2 for Itanium-based Systems
(KB2731847)	Elevation of Privilege	Important	KB2718523 in MS12-047 replaced by KB2731847
Windows Server 2008 R2 for Itanium-based Systems Service Pack 1
(KB2731847)	Elevation of Privilege	Important	KB2718523 in MS12-047 replaced by KB2731847
Server Core installation option
Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation)
(KB2731847)	Elevation of Privilege	Important	KB2718523 in MS12-047 replaced by KB2731847
Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation)
(KB2731847)	Elevation of Privilege	Important	KB2718523 in MS12-047 replaced by KB2731847
Windows Server 2008 R2 for x64-based Systems (Server Core installation)
(KB2731847)	Elevation of Privilege	Important	KB2718523 in MS12-047 replaced by KB2731847
Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation)
(KB2731847)	Elevation of Privilege	Important	KB2718523 in MS12-047 replaced by KB2731847
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Frequently Asked Questions (FAQ) Related to This Security Update
Vulnerability Information
Severity Ratings and Vulnerability Identifiers
Win32k Use After Free Vulnerability - CVE-2012-2527
Update Information
Detection and Deployment Tools and Guidance
Security Update Deployment
Other Information
Acknowledgments

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

    Matthew Jurczyk of Google Inc for reporting the Win32k Use After Free Vulnerability (CVE-2012-2527)

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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.
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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

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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.
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Revisions

    V1.0 (August 14, 2012): Bulletin published.