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Microsoft Security Bulletin MS12-007 - Important

Vulnerability in AntiXSS Library Could Allow Information Disclosure (2607664)

Published: | Updated:

Version: 2.1

General Information

Executive Summary

This security update resolves one privately reported vulnerability in the Microsoft Anti-Cross Site Scripting (AntiXSS) Library. The vulnerability could allow information disclosure if an attacker passes a malicious script to a website using the sanitization function of the AntiXSS Library. The consequences of the disclosure of that information depends on the nature of the information itself. Note that this vulnerability would not allow an attacker to execute code or to elevate the attacker's user rights directly, but it could be used to produce information that could be used to try to further compromise the affected system. Only sites that use the sanitization module of the AntiXSS Library are affected by this vulnerability.

This security update is rated Important for the AntiXSS Library V3.x and the AntiXSS Library V4.0. For more information, see the subsection, Affected and Non-Affected Software, in this section.

The update addresses the vulnerability by upgrading the AntiXSS Library to a version that is not affected by the vulnerability. 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. Microsoft recommends that customers apply the update at the earliest opportunity.

Known Issues. Microsoft Knowledge Base Article 2607664 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.

Affected Software 

SoftwareMaximum Security ImpactAggregate Severity RatingBulletins Replaced by this Update
Microsoft Anti-Cross Site Scripting Library V3.x and Microsoft Anti-Cross Site Scripting Library V4.0[1][2]Information DisclosureImportantNone

[1]This download upgrades Microsoft Anti-Cross Site Scripting (AntiXSS) Library to a newer version of the Microsoft Anti-Cross Site Scripting Library that is not affected by the vulnerability.

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

Frequently Asked Questions (FAQ) Related to This Security Update

Vulnerability Information

Severity Ratings and Vulnerability Identifiers

AntiXSS Library Bypass Vulnerability - CVE-2012-0007

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. 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 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 (January 10, 2012): Bulletin published.
  • V2.0 (January 11, 2012): Announced that the original upgrade package, AntiXSS Library version 4.2, has been replaced with AntiXSS Library version 4.2.1. All users of the AntiXSS Library will need to upgrade to AntiXSS Library version 4.2.1 to help ensure they are protected from the vulnerability described in this bulletin. See the update FAQ for more information.
  • V2.1 (January 16, 2012): Added a link to Microsoft Knowledge Base Article 2607664 under Known Issues in the Executive Summary. Also, revised entry in the update FAQ to clarify why the upgrade to AntiXSS Library version 4.2.1 is only available from the Microsoft Download Center.