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                                    CERT-Renater

                         Note d'Information No. 2011/VULN322
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DATE                      : 13/04/2011

HARDWARE PLATFORM(S)      : /

OPERATING SYSTEM(S)       :  Windows XP, 2003, Vista, 2008, 7 running MHTML protocol handler.

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http://www.microsoft.com/technet/security/Bulletin/MS11-026.mspx
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Microsoft Security Bulletin MS11-026 - Important
Vulnerability in MHTML Could Allow Information Disclosure (2503658)
Version: 1.0

General Information

Executive Summary

This security update resolves a publicly disclosed vulnerability in the MHTML
protocol handler in Microsoft Windows. The vulnerability could allow
information disclosure if a user visited a specially crafted Web site. In a
Web-based attack scenario, a Web site could contain a specially crafted link
that is used to exploit this vulnerability. An attacker would have to convince
users to visit the Web site and open the specially crafted link.

This security update is rated Important for all supported editions of Windows
XP, Windows Vista, and Windows 7, and rated Low for all supported editions of
Windows Server 2003, Windows Server 2008, and Windows Server 2008 R2. For more
information, see the subsection, Affected and Non-Affected Software, in this
section.

Affected Software

Windows XP Service Pack 3
Windows XP Professional x64 Edition Service Pack 2
Windows Server 2003 Service Pack 2
Windows Server 2003 x64 Edition Service Pack 2
Windows Server 2003 with SP2 for Itanium-based Systems
Windows Vista Service Pack 1 and Windows Vista Service Pack 2
Windows Vista x64 Edition Service Pack 1 and Windows Vista x64 Edition
   Service Pack 2
Windows Server 2008 for 32-bit Systems and Windows Server 2008 for 32-bit
   Systems Service Pack 2**
Windows Server 2008 for x64-based Systems and Windows Server 2008 for
   x64-based Systems Service Pack 2**
Windows Server 2008 for Itanium-based Systems and Windows Server 2008 for
   Itanium-based Systems Service Pack 2
Windows 7 for 32-bit Systems and Windows 7 for 32-bit Systems Service Pack 1
Windows 7 for x64-based Systems and Windows 7 for x64-based Systems Service
   Pack 1
Windows Server 2008 R2 for x64-based Systems and Windows Server 2008 R2 for
   x64-based Systems Service Pack 1**
Windows Server 2008 R2 for Itanium-based Systems and Windows Server 2008 R2
   for Itanium-based Systems Service Pack 1

** Server Core installation not affected. The vulnerabilities addressed by
this update do not affect supported editions of Windows Server 2008 or Windows
Server 2008 R2 as indicated, when installed using the Server Core installation
option.

Vulnerability Information

MHTML Mime-Formatted Request Vulnerability - CVE-2011-0096

An information disclosure vulnerability exists in the way MHTML interprets
MIME-formatted requests for content blocks within a document. It is possible
under certain conditions for this vulnerability to allow an attacker to run a
client-side script in the wrong security context. Similar to server-side
cross-site scripting (XSS) vulnerabilities, it is possible under certain
conditions for this vulnerability to allow an attacker to inject a client-side
script in the response to a Web request run in the context of the user's
instance of Internet Explorer.


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