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Article
07/28/2009

Microsoft Security Bulletin MS09-035 – Moderate

Vulnerabilities in Visual Studio Active Template Library Could Allow Remote Code Execution (969706)

Published: July 28, 2009

Version: 1.0

General Information

Executive Summary

This security update addresses several privately reported vulnerabilities in the public versions of the Microsoft Active Template Library (ATL) included with Visual Studio. This security update is specifically intended for developers of components and controls. Developers who build and redistribute components and controls using ATL should install the update provided in this bulletin and follow the guidance provided to create, and distribute to their customers, components and controls that are not vulnerable to the vulnerabilities described in this security bulletin.

This security bulletin discusses vulnerabilities that could allow remote code execution if a user loaded a component or control built with the vulnerable versions of ATL.

While most Microsoft Security Bulletins discuss the risk of a vulnerability for a specific product, this security bulletin discusses the vulnerabilities that may be present in products built using the ATL. Therefore, this security update is rated Moderate for all supported editions of Microsoft Visual Studio .NET 2003, Microsoft Visual Studio 2005, Microsoft Visual Studio 2008, Microsoft Visual C++ 2005 Redistributable Package, and Microsoft Visual C++ 2008 Redistributable Package.

For more information on the impact of, and workarounds and mitigations for controls and components that may be vulnerable to these issues, please see Microsoft Security Advisory (973882).

For more information, see the subsection, Affected and Non-Affected Software, in this section.

The security update addresses the vulnerabilities by modifying the ATL headers so that components and controls built using the headers can safely initialize from a data stream. 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. Developers who have built components and controls using ATL should download this update and recompile their components and controls following the guidance provided in the following MSDN article.

The majority of Visual Studio customers who have automatic updating enabled will receive this update automatically and receive the updated ATL. However, as noted earlier, additional steps will be needed to update potentially vulnerable controls and components. 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 969706 documents the currently known issues that customers may experience when installing this security update. The article also documents recommended solutions for these issues.

Top of section

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

Software
Maximum Security Impact
Aggregate Severity Rating
Bulletins Replaced by this Update

Microsoft Visual Studio .NET 2003 Service Pack 1
(KB971089)

Remote Code Execution

Moderate

None

Microsoft Visual Studio 2005 Service Pack 1
(KB971090)

Remote Code Execution

Moderate

None

Microsoft Visual Studio 2005 Service Pack 1 64-bit Hosted Visual C++ Tools
(KB973830)

Remote Code Execution