Vulnerabilities in Microsoft Forefront Unified Access Gateway #UAG Could Cause Remote Code Execution (2544641)


Today Microsoft released an important security update which applies to all versions of Microsoft Forefront Unified Access Gateway (UAG).

Executive Summary

This security update resolves five privately reported vulnerabilities in Microsoft Forefront Unified Access Gateway (UAG). The most severe of these vulnerabilities could allow remote code execution if a user visits an affected Web site using a specially crafted URL. However, an attacker would have no way to force users to visit such a Web site. Instead, an attacker would have to persuade users to visit the Web site, typically by getting them to click a link in an e-mail message or Instant Messenger message that takes users to the attacker’s Web site.

This security update is rated Important for all supported versions of Microsoft Forefront Unified Access Gateway 2010. 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 UAG handles specially crafted requests, modifying the MicrosoftClient.JAR file, and adding exception handling around the null value of the UAG Web server. 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. Microsoft recommends that customers apply the update at the earliest opportunity.

Known Issues.
Microsoft Knowledge Base Article 2544641 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 System Maximum Security Impact Aggregate Severity Rating Bulletins Replaced by this Update
Microsoft Forefront Unified Access Gateway 2010[1]
(KB2522482)
Remote Code Execution Important None
Microsoft Forefront Unified Access Gateway 2010 Update 1[1]
(KB2522483)
Remote Code Execution Important None
Microsoft Forefront Unified Access Gateway 2010 Update 2[1]
(KB2522484)
Remote Code Execution Important None
Microsoft Forefront Unified Access Gateway 2010 Service Pack 1[1]
(KB2522485)
Remote Code Execution Important None

[1]This update is available from the Microsoft Download Center only. Please see the next section, Frequently Asked Questions (FAQ) Related to This Security Update.

Source:

http://technet.microsoft.com/en-us/security/bulletin/ms11-079

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