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Microsoft Security Bulletin MS12-020 - Critical

Vulnerabilities in Remote Desktop Could Allow Remote Code Execution (2671387)

Published: | Updated:

Version: 2.1

General Information

Executive Summary

This security update resolves two privately reported vulnerabilities in the Remote Desktop Protocol. The more severe of these vulnerabilities could allow remote code execution if an attacker sends a sequence of specially crafted RDP packets to an affected system. By default, the Remote Desktop Protocol (RDP) is not enabled on any Windows operating system. Systems that do not have RDP enabled are not at risk.

This security update is rated Critical 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 modifying the way that the Remote Desktop Protocol processes packets in memory and the way that the RDP service processes packets. 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. The majority of 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 immediately 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. Microsoft Knowledge Base Article 2671387 documents the currently known issues that customers may experience when installing this security update. The article also documents recommended solutions for these issues.

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, visit Microsoft Support Lifecycle.

Affected Software 

Operating SystemMaximum Security ImpactAggregate Severity RatingBulletins Replaced by this Update
Windows XP Service Pack 3
(KB2621440)
Remote Code ExecutionCriticalKB2570222 in MS11-065 replaced by KB2621440
Windows XP Professional x64 Edition Service Pack 2
(KB2621440)
Remote Code ExecutionCriticalKB2570222 in MS11-065 replaced by KB2621440
Windows Server 2003 Service Pack 2
(KB2621440)
Remote Code ExecutionCriticalKB2570222 in MS11-065 replaced by KB2621440
Windows Server 2003 x64 Edition Service Pack 2
(KB2621440)
Remote Code ExecutionCriticalKB2570222 in MS11-065 replaced by KB2621440
Windows Server 2003 with SP2 for Itanium-based Systems
(KB2621440)
Remote Code ExecutionCriticalKB2570222 in MS11-065 replaced by KB2621440
Windows Vista Service Pack 2
(KB2621440)
Remote Code ExecutionCriticalNo bulletin replaced by KB2621440
Windows Vista x64 Edition Service Pack 2
(KB2621440)
Remote Code ExecutionCriticalNo bulletin replaced by KB2621440
Windows Server 2008 for 32-bit Systems Service Pack 2*
(KB2621440)
Remote Code ExecutionCriticalNo bulletin replaced by KB2621440
Windows Server 2008 for x64-based Systems Service Pack 2*
(KB2621440)
Remote Code ExecutionCriticalNo bulletin replaced by KB2621440
Windows Server 2008 for Itanium-based Systems Service Pack 2
(KB2621440)
Remote Code ExecutionCriticalNo bulletin replaced by KB2621440
Windows 7 for 32-bit Systems and Windows 7 for 32-bit Systems Service Pack 1
(KB2621440)

Windows 7 for 32-bit Systems and Windows 7 for 32-bit Systems Service Pack 1
(KB2667402)
Remote Code ExecutionCritical[1]No bulletin replaced by KB2621440


No bulletin replaced by KB2667402
Windows 7 for x64-based Systems and Windows 7 for x64-based Systems Service Pack 1
(KB2621440)

Windows 7 for x64-based Systems and Windows 7 for x64-based Systems Service Pack 1
(KB2667402)
Remote Code ExecutionCritical[1]No bulletin replaced by KB2621440



No bulletin replaced by KB2667402
Windows Server 2008 R2 for x64-based Systems and Windows Server 2008 R2 for x64-based Systems Service Pack 1*
(KB2621440)

Windows Server 2008 R2 for x64-based Systems and Windows Server 2008 R2 for x64-based Systems Service Pack 1*
(KB2667402)
Remote Code ExecutionCritical[1]No bulletin replaced by KB2621440



No bulletin replaced by KB2667402
Windows Server 2008 R2 for Itanium-based Systems and Windows Server 2008 R2 for Itanium-based Systems Service Pack 1
(KB2621440)

Windows Server 2008 R2 for Itanium-based Systems and Windows Server 2008 R2 for Itanium-based Systems Service Pack 1
(KB2667402)
Remote Code ExecutionCritical[1]No bulletin replaced by KB2621440



No bulletin replaced by KB2667402

*Server Core installation affected. This update applies, with the same severity rating, to supported editions of Windows Server 2008 or Windows Server 2008 R2 as indicated, whether or not installed using the Server Core installation option. For more information on this installation option, see the TechNet articles, Managing a Server Core Installation and Servicing a Server Core Installation. Note that the Server Core installation option does not apply to certain editions of Windows Server 2008 and Windows Server 2008 R2; see Compare Server Core Installation Options.

[1]Update package KB2621440 addresses CVE-2012-0002 and update package KB2667402 addresses CVE-2012-0152. While CVE-2012-0152 has a lower severity rating than KB2621440 on affected versions of Microsoft Windows, the aggregate severity rating is Critical based on CVE-2012-0002. Customers should apply all updates offered for the version of Microsoft Windows installed on their systems.

Frequently Asked Questions (FAQ) Related to This Security Update

Vulnerability Information

Severity Ratings and Vulnerability Identifiers

Remote Desktop Protocol Vulnerability - CVE-2012-0002

Terminal Server Denial of Service Vulnerability - CVE-2012-0152

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:

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 visit the active protections websites provided by program partners, listed in Microsoft Active Protections Program (MAPP) Partners.

Support

  • Customers in the U.S. and Canada can receive technical support from Security Support or 1-866-PCSAFETY (1-866-727-2338). For more information about available support options, see Microsoft Help and Support.
  • International customers can receive support from their local Microsoft subsidiaries. For more information about how to contact Microsoft for support issues, visit the International Support website.

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 (March 13, 2012): Bulletin published.
  • V2.0 (June 12, 2012): Bulletin rereleased to reoffer security update KB2667402 on all supported editions of Windows 7 and Windows Server 2008 R2. Customers using Windows 7 or Windows Server 2008 R2, including those who have already successfully installed the update originally offered on March 13, 2012, should install the reoffered update. See the Update FAQ for details.
  • V2.1 (July 31, 2012): Bulletin revised to announce a detection change in the Windows Vista packages for KB2621440 to correct a Windows Update reoffering issue. This is a detection change only. Customers who have already successfully updated their systems do not need to take any action.