Objavljena je druga revizija sigurnosnog upozorenja oznake MS11-037, prvotno objavljenog 14. lipnja 2011., vezanog uz propust sustava Microsoft Windows. Napadač ga je mogao iskoristiti za otkrivanje osjetljivih informacija.

Microsoft Security Bulletin MS11-037 - Important
Vulnerability in MHTML Could Allow Information Disclosure (2544893)

Published: Tuesday, June 14, 2011 | Updated: Tuesday, November 15, 2011

Version: 2.1
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 opens a specially crafted URL from an attacker's web site. An attacker would have to convince the user to visit the web site, typically by getting them to follow a link in an e-mail message or Instant Messenger message.

This security update is rated Important for all supported editions of Windows XP, Windows Vista, and Windows 7, and is 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.

The security update addresses the vulnerability by correcting the way that the MHTML parser handles requests. 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. The majority of customers have automatic updating enabled and will not need to take any action because this security update will be downloaded and installed automatically. Customers who have not enabled automatic updating need to check for updates and install this update manually. For information about specific configuration options in automatic updating, see Microsoft Knowledge Base Article 294871.

For administrators and enterprise installations, or end users who want to install this security update manually, Microsoft recommends that customers apply the update at the earliest opportunity using update management software, or by checking for updates using the Microsoft Update service.

See also the section, Detection and Deployment Tools and Guidance, later in this bulletin.

Known Issues. None
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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
Windows XP Service Pack 3	Information Disclosure	Important	MS11-026
Windows XP Professional x64 Edition Service Pack 2	Information Disclosure	Important	MS11-026
Windows Server 2003 Service Pack 2	Information Disclosure	Low	MS11-026
Windows Server 2003 x64 Edition Service Pack 2	Information Disclosure	Low	MS11-026
Windows Server 2003 with SP2 for Itanium-based Systems	Information Disclosure	Low	MS11-026
Windows Vista Service Pack 1 and Windows Vista Service Pack 2	Information Disclosure	Important	MS11-026
Windows Vista x64 Edition Service Pack 1 and Windows Vista x64 Edition Service Pack 2	Information Disclosure	Important	MS11-026
Windows Server 2008 for 32-bit Systems and Windows Server 2008 for 32-bit Systems Service Pack 2**	Information Disclosure	Low	MS11-026
Windows Server 2008 for x64-based Systems and Windows Server 2008 for x64-based Systems Service Pack 2**	Information Disclosure	Low	MS11-026
Windows Server 2008 for Itanium-based Systems and Windows Server 2008 for Itanium-based Systems Service Pack 2	Information Disclosure	Low	MS11-026
Windows 7 for 32-bit Systems and Windows 7 for 32-bit Systems Service Pack 1	Information Disclosure	Important	MS11-026
Windows 7 for x64-based Systems and Windows 7 for x64-based Systems Service Pack 1	Information Disclosure	Important	MS11-026
Windows Server 2008 R2 for x64-based Systems and Windows Server 2008 R2 for x64-based Systems Service Pack 1**	Information Disclosure	Low	MS11-026
Windows Server 2008 R2 for Itanium-based Systems and Windows Server 2008 R2 for Itanium-based Systems Service Pack 1	Information Disclosure	Low	MS11-026

**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. For more information on this installation option, see the TechNet articles, Managing a Server Core Installation and Servicing a Server Core Installation. Note that the Server Core installation option does not apply to certain editions of Windows Server 2008 and Windows Server 2008 R2; see Compare Server Core Installation Options.
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Frequently Asked Questions (FAQ) Related to This Security Update
Vulnerability Information
Severity Ratings and Vulnerability Identifiers
MHTML Mime-Formatted Request Vulnerability - CVE-2011-1894
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:

    Billy Rios and Eduardo Vela Nava of the Google Security Team for working with us on changes to this bulletin.

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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 (June 14, 2011): Bulletin published.
    V2.0 (November 8, 2011): Bulletin rereleased to reoffer the update on all supported editions of Windows XP and Windows Server 2003. Customers using Windows XP or Windows Server 2003, including those who have already successfully installed the update originally offered on June 14, 2011, should install the reoffered update. See the Update FAQ for details.
    V2.1 (November 15, 2011): Corrected the install verification registry keys, update log file name, and removal information for Windows XP and Windows Server 2003. This is an informational change only.