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Microsoft Security Bulletin MS11-099 - Important

Cumulative Security Update for Internet Explorer (2618444)

Published: | Updated:

Version: 1.2

General Information

Executive Summary

This security update resolves three privately reported vulnerabilities in Internet Explorer. The most severe vulnerability could allow remote code execution if a user opens a legitimate HyperText Markup Language (HTML) file that is located in the same directory as a specially crafted dynamic link library (DLL) file.

This security update is rated Important for Internet Explorer 7, Internet Explorer 8, and Internet Explorer 9 on Windows clients and for Internet Explorer 9 for Windows Server 2008 R2. This security update is also rated Moderate for Internet Explorer 6 on all supported editions of Windows XP. This security update is also rated Low for Internet Explorer on Windows servers (except Windows Server 2008 R2). For more information, see the subsection, Affected and Non-Affected Software, in this section.

The update addresses the vulnerabilities by modifying the behavior of Internet Explorer XSS Filter, correcting the manner in which Internet Explorer loads external libraries, and correcting the way that Internet Explorer enforces the content settings supplied by the 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. 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. Microsoft Knowledge Base Article 2618444 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. 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 SystemComponentMaximum Security ImpactAggregate Severity RatingBulletins Replaced by This Update
Internet Explorer 6
Windows XP Service Pack 3Internet Explorer 6Information DisclosureModerateMS11-081
Windows XP Professional x64 Edition Service Pack 2Internet Explorer 6Information DisclosureModerateMS11-081
Windows Server 2003 Service Pack 2Internet Explorer 6Information DisclosureNo severity rating[1]MS11-081
Windows Server 2003 x64 Edition Service Pack 2Internet Explorer 6Information DisclosureNo severity rating[1]MS11-081
Windows Server 2003 with SP2 for Itanium-based SystemsInternet Explorer 6Information DisclosureNo severity rating[1]MS11-081
Internet Explorer 7
Windows XP Service Pack 3Internet Explorer 7Information DisclosureModerateMS11-081
Windows XP Professional x64 Edition Service Pack 2Internet Explorer 7Information DisclosureModerateMS11-081
Windows Server 2003 Service Pack 2Internet Explorer 7Information DisclosureNo severity rating[1]MS11-081
Windows Server 2003 x64 Edition Service Pack 2Internet Explorer 7Information DisclosureNo severity rating[1]MS11-081
Windows Server 2003 with SP2 for Itanium-based SystemsInternet Explorer 7Information DisclosureNo severity rating[1]MS11-081
Windows Vista Service Pack 2Internet Explorer 7Information DisclosureModerateMS11-081
Windows Vista x64 Edition Service Pack 2Internet Explorer 7Information DisclosureModerateMS11-081
Windows Server 2008 for 32-bit Systems Service Pack 2Internet Explorer 7**Information DisclosureNo severity rating[1]MS11-081
Windows Server 2008 for x64-based Systems Service Pack 2Internet Explorer 7**Information DisclosureNo severity rating[1]MS11-081
Windows Server 2008 for Itanium-based Systems Service Pack 2Internet Explorer 7Information DisclosureNo severity rating[1]MS11-081
Internet Explorer 8
Windows XP Service Pack 3Internet Explorer 8Information DisclosureImportantMS11-081
Windows XP Professional x64 Edition Service Pack 2Internet Explorer 8Information DisclosureImportantMS11-081
Windows Server 2003 Service Pack 2Internet Explorer 8Information DisclosureLowMS11-081
Windows Server 2003 x64 Edition Service Pack 2Internet Explorer 8Information DisclosureLowMS11-081
Windows Vista Service Pack 2Internet Explorer 8Information DisclosureImportantMS11-081
Windows Vista x64 Edition Service Pack 2Internet Explorer 8Information DisclosureImportantMS11-081
Windows Server 2008 for 32-bit Systems Service Pack 2Internet Explorer 8**Information DisclosureLowMS11-081
Windows Server 2008 for x64-based Systems Service Pack 2Internet Explorer 8**Information DisclosureLowMS11-081
Windows 7 for 32-bit Systems and Windows 7 for 32-bit Systems Service Pack 1Internet Explorer 8Information DisclosureImportantMS11-081
Windows 7 for x64-based Systems and Windows 7 for x64-based Systems Service Pack 1Internet Explorer 8Information DisclosureImportantMS11-081
Windows Server 2008 R2 for x64-based Systems and Windows Server 2008 R2 for x64-based Systems Service Pack 1Internet Explorer 8**Information DisclosureLowMS11-081
Windows Server 2008 R2 for Itanium-based Systems and Windows Server 2008 R2 for Itanium-based Systems Service Pack 1Internet Explorer 8Information DisclosureLowMS11-081
Internet Explorer 9
Windows Vista Service Pack 2Internet Explorer 9Information DisclosureModerateMS11-081
Windows Vista x64 Edition Service Pack 2Internet Explorer 9Information DisclosureModerateMS11-081
Windows Server 2008 for 32-bit Systems Service Pack 2Internet Explorer 9**Information DisclosureNo severity rating[1]MS11-081
Windows Server 2008 for x64-based Systems Service Pack 2Internet Explorer 9**Information DisclosureNo severity rating[1]MS11-081
Windows 7 for 32-bit Systems and Windows 7 for 32-bit Systems Service Pack 1Internet Explorer 9Remote Code ExecutionImportantMS11-081
Windows 7 for x64-based Systems and Windows 7 for x64-based Systems Service Pack 1Internet Explorer 9Remote Code ExecutionImportantMS11-081
Windows Server 2008 R2 for x64-based Systems and Windows Server 2008 R2 for x64-based Systems Service Pack 1Internet Explorer 9**Remote Code ExecutionImportantMS11-081

[1]Severity ratings do not apply to this update for the specified software because the known attack vectors for the vulnerability discussed in this bulletin are blocked in a default configuration. However, as a defense-in-depth measure, Microsoft recommends that customers of this software apply this security update.

**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.

Frequently Asked Questions (FAQ) Related to This Security Update

Vulnerability Information

Severity Ratings and Vulnerability Identifiers

XSS Filter Information Disclosure Vulnerability - CVE-2011-1992

Internet Explorer Insecure Library Loading Vulnerability - CVE-2011-2019

Content-Disposition Information Disclosure Vulnerability - CVE-2011-3404

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:

  • Thomas Stehle for reporting the XSS Filter Information Disclosure Vulnerability (CVE-2011-1992)
  • Andy Cooper of the Citrix Security Team for reporting the Internet Explorer Insecure Library Loading Vulnerability (CVE-2011-2019)
  • Robert Swiecki of Google Inc. for reporting the Content-Disposition Information Disclosure Vulnerability (CVE-2011-3404)
  • Yosuke Hasegawa for working with us on the Content-Disposition Information Disclosure Vulnerability (CVE-2011-3404)
  • Jan Schejbal for working with us on defense-in-depth changes included in this bulletin.

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.

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.

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 (December 13, 2011): Bulletin published.
  • V1.1 (December 13, 2011): Corrected mitigating factors for CVE-2011-1992. Corrected severity ratings for CVE-2011-3404. These are informational changes only. There were no changes to the security update files or detection logic.
  • V1.2 (January 10, 2012): Announced that this update, MS11-099, enables the protections provided in the Vulnerability in SSL/TLS Could Allow Information Disclosure update, MS12-006, for Internet Explorer. For more information, see the Update FAQ.