__________________________________________________________ The U.S. Department of Energy Computer Incident Advisory Capability ___ __ __ _ ___ / | /_\ / \___ __|__ / \ \___ __________________________________________________________ INFORMATION BULLETIN Vulnerability in Virtual PC and Virtual Server [Microsoft Security Bulletin (MS07-049)] August 15, 2007 14:00 GMT Number R-323 ______________________________________________________________________________ PROBLEM: An elevation of privilege vulnerability exists in Microsoft Visual PC and Microsoft Virtual Server that could allow a user with administrator permissions to the guest operating system to run code on the host operating sytsem or other guest operating systems. PLATFORM: Microsoft Virtual PC (all editions) Microsoft Virtual Server (all editions) Microsoft Virtual PC for Mac 6 (all editions) Microsoft Virtual PC for Mac 7 (all editions) DAMAGE: Could allow elevation of privileg. SOLUTION: Upgrade to the appropriate version. ______________________________________________________________________________ VULNERABILITY The risk is MEDIUM. Could allow elevation of privilege. ASSESSMENT: ______________________________________________________________________________ LINKS: CIAC BULLETIN: http://www.ciac.org/ciac/bulletins/r-323.shtml ORIGINAL BULLETIN: http://www.microsoft.com/technet/security/Bulletin/MS07- 049.mspx CVE: http://www.cve.mitre.org/cgi-bin/cvename.cgi?name= CVE-2007-0948 ______________________________________________________________________________ [***** Start Microsoft Security Bulletin (MS07-049) *****] Microsoft Security Bulletin MS07-049 - Important Vulnerability in Virtual PC and Virtual Server Could Allow Elevation of Privilege (937986) Published: August 14, 2007 Version: 1.0 General Information Executive Summary This important security update resolves one privately reported vulnerability. This is an elevation of privilege vulnerability. The vulnerability in Microsoft Virtual PC and Microsoft Virtual Server could allow a guest operating system user to run code on the host or another guest operating systems. Only guest operating system users who are granted administrative permissions to the guest operating system would be able to exploit this vulnerability. Guest operating system users not granted administrative permissions to the guest operating system would be unable to exploit this vulnerability. This is an important security update for supported releases of Microsoft Virtual PC 2004, Microsoft Virtual Server 2005, Microsoft Virtual Server 2005 R2, Microsoft Virtual PC for Mac Version 6.1, and Microsoft Virtual PC for Mac Version 7. For more information, see the subsection, Affected and Non-Affected Software, in this section. This security update addresses the vulnerability by improving interaction and initialization of components that communicate with the host operating system for virtual machines running under Microsoft Virtual PC and Microsoft Virtual 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. Microsoft recommends that customers apply the update at the earliest opportunity. Known Issues. Microsoft Knowledge Base Article 937986 documents the currently known issues that customers may experience when they install this security update. The article also documents recommended solutions for these issues. Top of section Affected and Non-Affected Software The software listed here has 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 Affected Software Maximum Security Impact Aggregate Severity Rating Bulletins Replaced by This Update Microsoft Virtual PC 2004 Elevation of Privilege Important None Microsoft Virtual PC 2004 Service Pack 1 Elevation of Privilege Important None Microsoft Virtual Server 2005 Standard Edition Elevation of Privilege Important None Microsoft Virtual Server 2005 Enterprise Edition Elevation of Privilege Important None Microsoft Virtual Server 2005 R2 Standard Edition Elevation of Privilege Important None Microsoft Virtual Server 2005 R2 Enterprise Edition Elevation of Privilege Important None Microsoft Virtual PC for Mac Version 6.1 Elevation of Privilege Important None Microsoft Virtual PC for Mac Version 7 Elevation of Privilege Important None Non-Affected Software Non-Affected Software Microsoft Virtual PC 2007 Microsoft Virtual Server 2005 R2 Service Pack 1 Vulnerability Information Severity Ratings and Vulnerability Identifiers Affected Software Virtual PC and Virtual Server Heap Overflow Vulnerability CVE-2007-0948 Aggregate Severity Rating Microsoft Virtual PC 2004 Important Elevation of Privilege Important Microsoft Virtual PC 2004 Service Pack 1 Important Elevation of Privilege Important Microsoft Virtual Server 2005 Standard Edition Important Elevation of Privilege Important Microsoft Virtual Server 2005 Enterprise Edition Important Elevation of Privilege Important Microsoft Virtual Server 2005 R2 Standard Edition Important Elevation of Privilege Important Microsoft Virtual Server 2005 R2 Enterprise Edition Important Elevation of Privilege Important Microsoft Virtual PC for Mac Version 6.1 Important Elevation of Privilege Important Microsoft Virtual PC for Mac Version 7 Important Elevation of Privilege Important Virtual PC and Virtual Server Heap Overflow Vulnerability - CVE-2007-0948 An elevation of privilege vulnerability exists in Microsoft Virtual PC and Microsoft Virtual Server that could allow a user with administrator permissions to the guest operating system to run code on the host operating system or other guest operating systems. An attacker with administrator permissions to the guest operating system, could exploit the vulnerability by running specially crafted code on the guest operating system. This could result in a heap overflow on the host or other guest operating systems. An attacker who successfully exploited this vulnerability could take complete control of an affected system. To view this vulnerability as a standard entry in the Common Vulnerabilities and Exposures list, see CVE-2007-0948. Update Information Detection and Deployment Tools and Guidance Manage the software and security updates you need to deploy to the servers, desktop, and mobile computers in your organization. For more information see the TechNet Update Management Center. The Microsoft TechNet Security Web site provides additional information about security in Microsoft products. Security updates are available from Microsoft Update, Windows Update, and Office Update. Security updates are also available at the Microsoft Download Center. You can find them most easily by doing a keyword search for "security_patch." Finally, security updates can be downloaded from the Windows Update Catalog. For more information about the Windows Update Catalog, see Microsoft Knowledge Base Article 323166. Detection and Deployment Guidance Microsoft has provided detection and deployment guidance for this month’s security updates. This guidance will also help IT professionals understand how they can use various tools to help deploy the security update, such as Windows Update, Microsoft Update, Office Update, the Microsoft Baseline Security Analyzer (MBSA), the Office Detection Tool, Microsoft Systems Management Server (SMS), the Extended Security Update Inventory Tool, and the Enterprise Update Scan Tool (EST). For more information, see Microsoft Knowledge Base Article 910723. Microsoft Baseline Security Analyzer and Enterprise Update Scan Tool (EST) Microsoft Baseline Security Analyzer (MBSA) allows administrators to scan local and remote systems for missing security updates as well as common security misconfigurations. For more information about MBSA, visit Microsoft Baseline Security Analyzer. MBSA 1.2.1 does not support detection for this security update. The Enterprise Update Scan Tool does, and is what customers can use instead of MBSA 1.2.1. For download links and more information about the version of EST that is being released this month, see Microsoft Knowledge Base Article 894193. SMS customers should also see the heading, Systems Management Server, for more information about SMS and EST. The following table provides the MBSA and EST detection summary for this security update. Software MBSA 1.2.1 EST MBSA 2.0.1 Microsoft Virtual PC 2004 No Yes Yes Microsoft Virtual Server 2005 No Yes Yes Microsoft Virtual Server 2005 R2 No Yes Yes Microsoft Virtual PC for Mac Version 6.1 No No No Microsoft Virtual PC for Mac Version 7 No No No Note for Windows Vista Microsoft does not support installing MBSA 2.0.1 on computers that run Windows Vista, but you may install MBSA 2.0.1 on a supported operating system and then scan the Windows Vista-based computer remotely. For additional information about MBSA support for Windows Vista, visit the MBSA Web site. See also Microsoft Knowledge Base Article 931943: Microsoft Baseline Security Analyzer (MBSA) support for Windows Vista. For more information about MBSA, visit the MBSA Web site. For more information about the software that Microsoft Update and MBSA 2.0 currently do not detect, see Microsoft Knowledge Base Article 895660. Windows Server Update Services By using Windows Server Update Services (WSUS), administrators can deploy the latest critical updates and security updates for Windows 2000 operating systems and later, Office XP and later, Exchange Server 2003, and SQL Server 2000 to Windows 2000 and later operating systems. For more information about how to deploy this security update using Windows Server Update Services, visit the Windows Server Update Services Web site. Systems Management Server The following table provides the SMS detection and deployment summary for this security update. Software SMS 2.0 EST SMS 2003 Microsoft Virtual PC 2004 No Yes Yes Microsoft Virtual Server 2005 No Yes Yes Microsoft Virtual Server 2005 R2 No Yes Yes Microsoft Virtual PC for Mac Version 6.1 No No No Microsoft Virtual PC for Mac Version 7 No No No SMS 2.0 and SMS 2003 Software Update Services (SUS) Feature Pack can use MBSA 1.2.1 for detection and therefore have the same limitation that is listed earlier in this bulletin related to programs that MBSA 1.2.1 does not detect. For SMS 2.0, the SMS SUS Feature Pack, which includes the Security Update Inventory Tool (SUIT), can be used by SMS to detect security updates. SMS SUIT uses the MBSA 1.2.1 engine for detection. For more information about SUIT, visit the following Microsoft Web site. For more information about the limitations of SUIT, see Microsoft Knowledge Base Article 306460. The SMS SUS Feature Pack also includes the Microsoft Office Inventory Tool to detect required updates for Microsoft Office applications. For SMS 2003, the SMS 2003 Inventory Tool for Microsoft Updates (ITMU) can be used by SMS to detect security updates that are offered by Microsoft Update and that are supported by Windows Server Update Services. For more information about the SMS 2003 ITMU, visit the following Microsoft Web site. SMS 2003 can also use the Microsoft Office Inventory Tool to detect required updates for Microsoft Office applications. Note for Windows Vista Microsoft Systems Management Server 2003 with Service Pack 3 includes support for Windows Vista manageability. For more information about SMS, visit the SMS Web site. Security Update Deployment Affected Software For information about the specific security update for your affected software, click the appropriate link: * Microsoft Virtual PC (all editions) * Microsoft Virtual Server (all editions) * Microsoft Virtual PC for Mac 6 (all editions) * Microsoft Virtual PC for Mac 7 (all editions) Other Information Acknowledgments Microsoft thanks the following for working with us to help protect customers: • Rafal Wojtczuk of McAfee Avert Labs for working with Microsoft on the Vulnerability in Virtual PC and Virtual Server Could Allow Elevation of Privilege Vulnerability – (CVE-2007-0948). 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 (August 14, 2007): Bulletin published. [***** End Microsoft Security Bulletin (MS07-049) *****] _______________________________________________________________________________ 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. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or the University of California, and shall not be used for advertising or product endorsement purposes. 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