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Microsoft Security Bulletin MS12-038 - Critical
Vulnerability in .NET Framework Could Allow Remote Code Execution (2706726)

Published: Tuesday, June 12, 2012

Version: 1.0
General Information
Executive Summary

This security update resolves one privately reported vulnerability in the Microsoft .NET Framework. The vulnerability could allow remote code execution on a client system if a user views a specially crafted webpage using a web browser that can run XAML Browser Applications (XBAPs). Users whose accounts are configured to have fewer user rights on the system could be less impacted than users who operate with administrative user rights. The vulnerability could also be used by Windows .NET Framework applications to bypass Code Access Security (CAS) restrictions. In a web browsing attack scenario, an attacker could host a website that contains a webpage that is used to exploit this vulnerability. In addition, compromised websites and websites that accept or host user-provided content or advertisements could contain specially crafted content that could exploit this vulnerability. In all cases, however, an attacker would have no way to force users to visit these websites. Instead, an attacker would have to convince users to visit the website, typically by getting them to click a link in an email message or Instant Messenger message that takes users to the attacker's website.

This security update is rated Critical for Microsoft .NET Framework 2.0 Service Pack 2, Microsoft .NET Framework 3.5.1, and Microsoft .NET Framework 4 on all supported editions of Microsoft Windows. For more information, see the subsection, Affected and Non-Affected Software, in this section.

The security update addresses the vulnerability by correcting the manner in which the .NET Framework validates data passed to function pointers. 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. 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. 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, visit Microsoft Support Lifecycle.

Affected Software 
Operating System	Component	Maximum Security Impact	Aggregate Severity Rating	Updates Replaced
Windows XP
Windows XP Service Pack 3	Microsoft .NET Framework 2.0 Service Pack 2
(KB2686828)

Microsoft .NET Framework 4[1]
(KB2686827)	Remote Code Execution	Critical	None
Windows XP Professional x64 Edition Service Pack 2	Microsoft .NET Framework 2.0 Service Pack 2
(KB2686828)

Microsoft .NET Framework 4[1]
(KB2686827)	Remote Code Execution	Critical	None
Windows Server 2003
Windows Server 2003 Service Pack 2	Microsoft .NET Framework 2.0 Service Pack 2
(KB2686828)

Microsoft .NET Framework 4[1]
(KB2686827)	Remote Code Execution	Critical	None
Windows Server 2003 x64 Edition Service Pack 2	Microsoft .NET Framework 2.0 Service Pack 2
(KB2686828)

Microsoft .NET Framework 4[1]
(KB2686827)	Remote Code Execution	Critical	None
Windows Server 2003 with SP2 for Itanium-based Systems	Microsoft .NET Framework 2.0 Service Pack 2
(KB2686828)

Microsoft .NET Framework 4[1]
(KB2686827)	Remote Code Execution	Critical	None
Windows Vista
Windows Vista Service Pack 2	Microsoft .NET Framework 2.0 Service Pack 2
(KB2686833)

Microsoft .NET Framework 4[1]
(KB2686827)	Remote Code Execution	Critical	None
Windows Vista x64 Edition Service Pack 2	Microsoft .NET Framework 2.0 Service Pack 2
(KB2686833)

Microsoft .NET Framework 4[1]
(KB2686827)	Remote Code Execution	Critical	None
Windows Server 2008
Windows Server 2008 for 32-bit Systems Service Pack 2	Microsoft .NET Framework 2.0 Service Pack 2
(KB2686833)

Microsoft .NET Framework 4[1]
(KB2686827)	Remote Code Execution	Critical	None
Windows Server 2008 for x64-based Systems Service Pack 2	Microsoft .NET Framework 2.0 Service Pack 2
(KB2686833)

Microsoft .NET Framework 4[1]
(KB2686827)	Remote Code Execution	Critical	None
Windows Server 2008 for Itanium-based Systems Service Pack 2	Microsoft .NET Framework 2.0 Service Pack 2
(KB2686833)

Microsoft .NET Framework 4[1]
(KB2686827)	Remote Code Execution	Critical	None
Windows 7
Windows 7 for 32-bit Systems	Microsoft .NET Framework 3.5.1
(KB2686830)

Microsoft .NET Framework 4[1]
(KB2686827)	Remote Code Execution	Critical	None
Windows 7 for 32-bit Systems Service Pack 1	Microsoft .NET Framework 3.5.1
(KB2686831)

Microsoft .NET Framework 4[1]
(KB2686827)	Remote Code Execution	Critical	None
Windows 7 for x64-based Systems	Microsoft .NET Framework 3.5.1
(KB2686830)

Microsoft .NET Framework 4[1]
(KB2686827)	Remote Code Execution	Critical	None
Windows 7 for x64-based Systems Service Pack 1	Microsoft .NET Framework 3.5.1
(KB2686831)

Microsoft .NET Framework 4[1]
(KB2686827)	Remote Code Execution	Critical	None
Windows Server 2008 R2
Windows Server 2008 R2 for x64-based Systems	Microsoft .NET Framework 3.5.1
(KB2686830)

Microsoft .NET Framework 4[1]
(KB2686827)	Remote Code Execution	Critical	None
Windows Server 2008 R2 for x64-based Systems Service Pack 1	Microsoft .NET Framework 3.5.1
(KB2686831)

Microsoft .NET Framework 4[1]
(KB2686827)	Remote Code Execution	Critical	None
Windows Server 2008 R2 for Itanium-based Systems	Microsoft .NET Framework 3.5.1
(KB2686830)

Microsoft .NET Framework 4[1]
(KB2686827)	Remote Code Execution	Critical	None
Windows Server 2008 R2 for Itanium-based Systems Service Pack 1	Microsoft .NET Framework 3.5.1
(KB2686831)

Microsoft .NET Framework 4[1]
(KB2686827)	Remote Code Execution	Critical	None
Server Core installation option
Windows Server 2008 R2 for x64-based Systems	Microsoft .NET Framework 3.5.1
(KB2686830)	Remote Code Execution	Critical	None
Windows Server 2008 R2 for x64-based Systems Service Pack 1	Microsoft .NET Framework 3.5.1
(KB2686831)

Microsoft .NET Framework 4[1]
(KB2686827)	Remote Code Execution	Critical	None

[1].NET Framework 4 and .NET Framework 4 Client Profile affected. The .NET Framework version 4 redistributable packages are available in two profiles: .NET Framework 4 and .NET Framework 4 Client Profile. .NET Framework 4 Client Profile is a subset of .NET Framework 4. The vulnerability addressed in this update affects both .NET Framework 4 and .NET Framework 4 Client Profile. For more information, see the MSDN article, Installing the .NET Framework.

Non-Affected Software
Operating System
Microsoft .NET Framework 1.0 Service Pack 3
Microsoft .NET Framework 1.1 Service Pack 1
Microsoft .NET Framework 3.0 Service Pack 2
Microsoft .NET Framework 3.5 Service Pack 1
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Frequently Asked Questions (FAQ) Related to This Security Update
Vulnerability Information
Severity Ratings and Vulnerability Identifiers
.NET Framework Memory Access Vulnerability - CVE-2012-1855
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:

    Vitaliy Toropov, working with Tipping Point's Zero Day Initiative, for reporting the .NET Framework Memory Access Vulnerability (CVE-2012-1855)

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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 visit 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 (June 12): Bulletin published.