__________________________________________________________ The U.S. Department of Energy Computer Incident Advisory Capability ___ __ __ _ ___ / | /_\ / \___ __|__ / \ \___ __________________________________________________________ INFORMATION BULLETIN Vulnerability in MSN Messenger and Windows Live Messenger [Microsoft Security Bulletin (MS07-054)] September 11, 2007 21:00 GMT Number R-343 [REVISED 18 Sept 2007] ______________________________________________________________________________ PROBLEM: A remote code execution vulnerability that could allow remote code execution when a user chooses to accept a webcam or video chat invitation from an attacker. PLATFORM: MSN Messenger (all versions) on Windows 2000 MSN Messenger or Windows Live Messenger (all versions) on Windows XP, Windows Server 2003, and Windows Vista DAMAGE: An attacker could take complete control of the affected system. SOLUTION: Upgrade to the appropriate version. ______________________________________________________________________________ VULNERABILITY The risk is MEDIUM. An attacker could take complete control of ASSESSMENT: the affected system. ______________________________________________________________________________ LINKS: CIAC BULLETIN: http://www.ciac.org/ciac/bulletins/r-343.shtml ORIGINAL BULLETIN: http://www.microsoft.com/technet/security/Bulletin/MS07-054.mspx CVE: http://www.cve.mitre.org/cgi-bin/cvename.cgi?name= CVE-2007-2931 ______________________________________________________________________________ REVISION HISTORY: 09/18/2007 - revised R-343 to reflect changes Microsoft has made in MS07-054 where they added Download center links added to Affected Software table for upgrading to Windows Live Messenger 8.1. [***** Start Microsoft Security Bulletin (MS07-054) *****] Microsoft Security Bulletin MS07-054 - Important Vulnerability in MSN Messenger and Windows Live Messenger Could Allow Remote Code Execution (942099) Published: September 11, 2007 | Updated: September 12, 2007 Version: 1.1 General Information Executive Summary This important security update resolves a publicly disclosed vulnerability in MSN Messenger and Windows Live Messenger. The vulnerability could allow remote code execution when a user accepts a webcam or video chat invitation from an attacker. An attacker who successfully exploited this vulnerability could take complete control of the affected system. Users whose accounts are configured to have fewer user rights on the system could be less impacted than users who operate with administrative user rights. Customers using MSN Messenger 7.0.0820 or Windows Live Messenger 8.1 are not affected by this vulnerability. For more information, see the subsection, Affected and Non-Affected Software, in this section. 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 using MSN Messenger 6.2 and MSN Messenger 7.0 on Microsoft Windows 2000 Service Pack 4 upgrade to MSN Messenger 7.0.0820 at the earliest opportunity. Customers on other supported Windows platforms, running MSN Messenger 6.2, MSN Messenger 7.0, MSN Messenger 7.5, or Windows Live Messenger 8.0, should upgrade to Windows Live Messenger 8.1 at the earliest opportunity. Known Issues. None Top of section 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. Affected Software Operating System Software Maximum Security Impact Aggregate Severity Rating Bulletins Replaced by This Update Microsoft Windows 2000 Service Pack 4 MSN Messenger 6.2 MSN Messenger 7.0 Remote Code Execution Important None Windows XP Service Pack 2 MSN Messenger 6.2 MSN Messenger 7.0 MSN Messenger 7.5 Windows Live Messenger 8.0 Remote Code Execution Important None Windows XP Professional x64 Edition MSN Messenger 6.2 MSN Messenger 7.0 MSN Messenger 7.5 Windows Live Messenger 8.0 Remote Code Execution Important None Windows XP Professional x64 Edition Service Pack 2 MSN Messenger 6.2 MSN Messenger 7.0 MSN Messenger 7.5 Windows Live Messenger 8.0 Remote Code Execution Important None Windows Server 2003 Service Pack 1 and Windows Server 2003 Service Pack 2 MSN Messenger 6.2 MSN Messenger 7.0 MSN Messenger 7.5 Windows Live Messenger 8.0 Remote Code Execution Important None Windows Server 2003 x64 Edition MSN Messenger 6.2 MSN Messenger 7.0 MSN Messenger 7.5 Windows Live Messenger 8.0 Remote Code Execution Important None Windows Server 2003 x64 Edition Service Pack 2 MSN Messenger 6.2 MSN Messenger 7.0 MSN Messenger 7.5 Windows Live Messenger 8.0 Remote Code Execution Important None Windows Vista MSN Messenger 6.2 MSN Messenger 7.0 MSN Messenger 7.5 Windows Live Messenger 8.0 Remote Code Execution Important None Windows Vista x64 Edition MSN Messenger 6.2 MSN Messenger 7.0 MSN Messenger 7.5 Windows Live Messenger 8.0 Remote Code Execution Important None Non-Affected Software Operating System Software Microsoft Windows 2000 Service Pack 4 MSN Messenger 7.0.0820 Windows XP Service Pack 2 Windows Live Messenger 8.1 Windows XP Professional x64 Edition Windows Live Messenger 8.1 Windows XP Professional x64 Edition Service Pack 2 Windows Live Messenger 8.1 Windows Server 2003 Service Pack 1 and Windows Server 2003 Service Pack 2 Windows Live Messenger 8.1 Windows Server 2003 x64 Edition Windows Live Messenger 8.1 Windows Server 2003 x64 Edition Service Pack 2 Windows Live Messenger 8.1 Windows Vista Windows Live Messenger 8.1 Windows Vista x64 Edition Windows Live Messenger 8.1 Top of section Vulnerability Information Severity Ratings and Vulnerability Identifiers Vulnerability Severity Rating and Maximum Security Impact by Affected Software Affected Software MSN Messenger Webcam or Video Chat Session Remote Code Execution Vulnerability – CVE-2007-2931 Aggregate Severity Rating MSN Messenger 6.2 MSN Messenger 7.0 MSN Messenger 7.5 Windows Live Messenger 8.0 Important Remote Code Execution Important Top of section MSN Messenger Webcam or Video Chat Session Remote Code Execution Vulnerability – CVE-2007-2931 A remote code execution vulnerability exists in MSN Messenger 6.2, MSN Messenger 7.0, MSN Messenger 7.5, and Windows Live Messenger 8.0. The vulnerability could allow remote code execution when a user chooses to accept a webcam or video chat invitation from an attacker. An attacker who successfully exploited this vulnerability could take complete control of the affected system. Users whose accounts are configured to have fewer user rights on the system could be less impacted than users who operate with administrative user rights. To view this vulnerability as a standard entry in the Common Vulnerabilities and Exposures list, see CVE-2007-2931. Update Information Security Update Deployment Affected Software For information about the specific security update for your affected software, click the appropriate link: * MSN Messenger (all versions) on Windows 2000 * MSN Messenger or Windows Live Messenger (all versions) on Windows XP, Windows Server 2003, and Windows Vista Other Information Acknowledgments Microsoft thanks the following for working with us to help protect customers: • Woo Shi of team 509 for reporting the MSN Messenger Video Chat Remote Code Execution Vulnerability – CVE-2007-2931 Top of section Support • Customers in the U.S. and Canada can receive technical support from Microsoft Product Support Services at 1-866-PCSAFETY. There is no charge for support calls that are associated with security updates. • 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. Top of section 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. Top of section Revisions • V1.0 (September 11, 2007): Bulletin published. • V1.1 (September 12, 2007): Download center links added to Affected Software table for upgrading to Windows Live Messenger 8.1. [***** End Microsoft Security Bulletin (MS07-054) *****] _______________________________________________________________________________ CIAC wishes to acknowledge the contributions of Microsoft for the information contained in this bulletin. _______________________________________________________________________________ CIAC, the Computer Incident Advisory Capability, is the computer security incident response team for the U.S. Department of Energy (DOE) and the emergency backup response team for the National Institutes of Health (NIH). CIAC is located at the Lawrence Livermore National Laboratory in Livermore, California. CIAC is also a founding member of FIRST, the Forum of Incident Response and Security Teams, a global organization established to foster cooperation and coordination among computer security teams worldwide. CIAC services are available to DOE, DOE contractors, and the NIH. CIAC can be contacted at: Voice: +1 925-422-8193 (7x24) FAX: +1 925-423-8002 STU-III: +1 925-423-2604 E-mail: ciac@ciac.org Previous CIAC notices, anti-virus software, and other information are available from the CIAC Computer Security Archive. World Wide Web: http://www.ciac.org/ Anonymous FTP: ftp.ciac.org PLEASE NOTE: Many users outside of the DOE, ESnet, and NIH computing communities receive CIAC bulletins. If you are not part of these communities, please contact your agency's response team to report incidents. Your agency's team will coordinate with CIAC. The Forum of Incident Response and Security Teams (FIRST) is a world-wide organization. A list of FIRST member organizations and their constituencies can be obtained via WWW at http://www.first.org/. This document was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor the University of California nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial products, process, or service by trade name, trademark, manufacturer, or otherwise, does not necessarily constitute or imply its endorsement, recommendation or favoring by the United States Government or the University of California. 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