Zabilježeno je više sigurnosnih propusta vezanih uz Microsoft Forefront Unified Access Gateway koje je moguće iskoristiti za izvođenje napada uskraćivanja usluge, XSS napad te umetanje pojedinih podataka.

Microsoft Security Bulletin MS11-079 - Important
Vulnerabilities in Microsoft Forefront Unified Access Gateway Could Cause Remote Code Execution (2544641)

Published: Tuesday, October 11, 2011

Version: 1.0
General Information
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.
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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	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.
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Frequently Asked Questions (FAQ) Related to This Security Update
Vulnerability Information
Severity Ratings and Vulnerability Identifiers
ExcelTable Response Splitting XSS Vulnerability - CVE-2011-1895
ExcelTable Reflected XSS Vulnerability - CVE-2011-1896
Default Reflected XSS Vulnerability - CVE-2011-1897
Poisoned Cup of Code Execution Vulnerability - CVE-2011-1969
Null Session Cookie Crash - CVE-2011-2012
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:

    Tenable Network Security for reporting the ExcelTable Response Splitting XSS Vulnerabilitiy (CVE-2011-1895)
    Tenable Network Security for reporting the ExcelTable Reflected XSS Vulnerability (CVE-2011-1896)
    Tenable Network Security for reporting the Default Reflected XSS Vulnerability (CVE-2011-1897)

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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 Web sites provided by program partners, listed in Microsoft Active Protections Program (MAPP) Partners.
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Support

    Customers in the U.S. and Canada can receive technical support from Security Support or 1-866-PCSAFETY. There is no charge for support calls that are associated with security updates. For more information about available support options, see Microsoft Help and Support.
    International customers can receive support from their local Microsoft subsidiaries. There is no charge for support that is associated with security updates. For more information about how to contact Microsoft for support issues, visit the International Support Web site.

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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 (October 11, 2011): Bulletin published.