===================================================================== CERT-Renater Note d'Information No. 2009/VULN356 _____________________________________________________________________ DATE : 08/09/2009 HARDWARE PLATFORM(S) : / OPERATING SYSTEM(S) : Windows 2000, Windows XP, Windows Server 2003, Windows Vista, Windows Server 2008 running JScript scripting engine. ====================================================================== KB971961 http://www.microsoft.com/technet/security/Bulletin/MS09-045.mspx ______________________________________________________________________ Microsoft Security Bulletin MS09-045 - Critical Vulnerability in JScript Scripting Engine Could Allow Remote Code Execution (971961) Published: September 08, 2009 Version: 1.0 General Information Executive Summary This security update resolves a privately reported vulnerability in the JScript scripting engine that could allow remote code execution if a user opened a specially crafted file or visited a specially crafted Web site and invoked a malformed script. If a user is logged on with administrative user rights, an attacker who successfully exploited this vulnerability could take complete control of an affected system. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights. 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. This security update is rated Critical for JScript 5.1 on Microsoft Windows 2000 Service Pack 4 and Critical for JScript 5.6, JScript 5.7 and JScript 5.8 on all supported releases of the Windows operating system except Windows 7 and Windows Server 2008 R2. For more information, see the subsection, Affected and Non-Affected Software, in this section. This security update addresses the vulnerability by modifying the way that the JScript engine processes scripts in Web pages. 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 immediately 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 971961 documents the currently known issues that customers may experience when installing this security update. The article also documents recommended solutions for these issues. Affected Software Microsoft Windows 2000 Service Pack 4: JScript 5.1 and JScript 5.6 Windows XP Service Pack 2: JScript 5.6 JScript 5.7 Windows XP Service Pack 3: JScript 5.7 Windows XP Service Pack 2 and Windows XP Service Pack 3: JScript 5.8 Windows XP Professional x64 Edition Service Pack 2: JScript 5.6 JScript 5.7 JScript 5.8 Windows Server 2003 Service Pack 2: JScript 5.6 JScript 5.7 JScript 5.8 Windows Server 2003 x64 Edition Service Pack 2: JScript 5.6 JScript 5.7 JScript 5.8 Windows Server 2003 with SP2 for Itanium-based Systems: JScript 5.6 JScript 5.7 Windows Vista, Windows Vista Service Pack 1, and Windows Vista Service Pack 2: JScript 5.7 JScript 5.8 Windows Vista x64 Edition, Windows Vista x64 Edition Service Pack 1, and Windows Vista x64 Edition Service Pack 2: JScript 5.7 JScript 5.8 Windows Server 2008 for 32-bit Systems and Windows Server 2008 for 32-bit Systems Service Pack 2: JScript 5.7 JScript 5.8 Windows Server 2008 for x64-based Systems and Windows Server 2008 for x64-based Systems Service Pack 2: JScript 5.7 JScript 5.8 Windows Server 2008 for Itanium-based Systems and Windows Server 2008 for Itanium-based Systems Service Pack 2: JScript 5.7 Vulnerability Information JScript Remote Code Execution Vulnerability - CVE-2009-1920 A remote code execution vulnerability exists in the way that the JScript scripting engine processes scripts in Web pages. The vulnerability could allow remote code execution if a user opened a specially crafted file or visited a Web site that is running a specially crafted script. If a user is logged on with administrative user rights, an attacker who successfully exploited this vulnerability could take complete control of an affected system. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights. 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. ====================================================================== ========================================================= Les serveurs de référence du CERT-Renater http://www.urec.fr/securite http://www.cru.fr/securite http://www.renater.fr ========================================================= + CERT-RENATER | tel : 01-53-94-20-44 + + 151 bd de l'Hopital | fax : 01-53-94-20-41 + + 75013 Paris | email: certsvp@renater.fr + =========================================================