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AUSCERT External Security Bulletin Redistribution
Vulnerability in AntiXSS Library Could Allow Information
11 January 2012
AusCERT Security Bulletin Summary
Product: Microsoft Anti-Cross Site Scripting Library
Operating System: Windows
Impact/Access: Cross-site Scripting -- Remote with User Interaction
CVE Names: CVE-2012-0007
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Microsoft Security Bulletin MS12-007 - Important
Vulnerability in AntiXSS Library Could Allow Information Disclosure (2607664)
Published Date: January 10, 2012
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
Software, in this section.
Microsoft Anti-Cross Site Scripting Library V3.x
Microsoft Anti-Cross Site Scripting Library V4.0
 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Library to a newer version of the Microsoft Anti-Cross Site Scripting Library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.
 This upgrade is available from the Microsoft Download Center only.
AntiXSS Library Bypass Vulnerability - CVE-2012-0007
An information disclosure vulnerability exists when the Microsoft Anti-Cross
Site Scripting (AntiXSS) Library incorrectly sanitizes specially crafted HTML.
An attacker who successfully exploited this vulnerability could perform a
cross-site scripting (XSS) attack on a website that is using the AntiXSS
Library to sanitize user provided HTML. This could allow an attacker to pass a
malicious script through a sanitization function and expose information not
intended to be disclosed. The consequences of the disclosure of this
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 in an attempt to further compromise the affected system.
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