===================================================================== CERT-Renater Note d'Information No. 2005/VULN720 _____________________________________________________________________ DATE : 18/11/2005 HARDWARE PLATFORM(S) : / OPERATING SYSTEM(S) : Windows 2000, Windows XP. ====================================================================== ******************************************************************** Title: Microsoft Security Advisory Notification Issued: November 16, 2005 ******************************************************************** Security Advisory Released Today ============================================== * Security Advisory (911052) - Title: Memory Allocation Denial of Service via RPC - Web site: http://go.microsoft.com/fwlink/?LinkId=56473 - From the Microsoft Website ========================== Microsoft is aware of public reports of proof-of-concept code that seeks to exploit a possible vulnerability in Microsoft Windows 2000 Service Pack 4 and in Microsoft Windows XP Service Pack 1. This vulnerability could allow an attacker to levy a denial of service attack of limited duration. On Windows XP Service Pack 1, an attacker must have valid logon credentials to try to exploit this vulnerability. The vulnerability could not be exploited remotely by anonymous users. However, the affected component is available remotely to users who have standard user accounts. Customers who have installed Windows XP Service Pack 2 are not affected by this vulnerability. Additionally, customers running Windows Server 2003 and Windows Server 2003 Service Pack 1 are not affected by this vulnerability. Microsoft is not aware of active attacks that use this vulnerability or of customer impact at this time. However, Microsoft is actively monitoring this situation to keep customers informed and to provide customer guidance as necessary. Microsoft is concerned that this new report of a vulnerability in Windows 2000 Service Pack 4 and Windows XP Service Pack 1 was not disclosed responsibly, potentially putting computer users at risk. We continue to encourage responsible disclosure of vulnerabilities. We believe the commonly accepted practice of reporting vulnerabilities directly to a vendor serves everyone's best interests. This practice helps to ensure that customers receive comprehensive, high-quality updates for security vulnerabilities without exposure to malicious attackers while the update is being developed. We continue to encourage customers to follow our Protect Your PC guidance of enabling a firewall, getting software updates, and installing antivirus software Customers can learn more about these steps by visiting Protect Your PC Web site. Mitigating Factors ================== On Windows XP Service Pack 1 an attacker must have valid logon credentials to try to exploit this vulnerability. The vulnerability could not be exploited remotely by anonymous users. However, the affected component is available remotely to users who have standard user accounts. In certain configurations, anonymous users could authenticate as the Guest account. For more information, see Microsoft Security Advisory 906574. Customers who are running Windows XP Service Pack 2, Windows Server 2003 and Windows Server 2003 Service Pack 1 are not affected by this vulnerability. Firewall best practices and standard default firewall configurations can help protect networks from attacks that originate outside the enterprise perimeter. Best practices recommend that systems that are connected to the Internet have a minimal number of ports exposed. Support: ======== Technical support resources can be found at: http://go.microsoft.com/fwlink/?LinkId=21131 International customers can get support from their local Microsoft subsidiaries. Phone numbers for international support can be found at: http://support.microsoft.com/common/international.aspx Additional Resources: ===================== * Microsoft has created a free monthly e-mail newsletter containing valuable information to help you protect your network. This newsletter provides practical security tips, topical security guidance, useful resources and links, pointers to helpful community resources, and a forum for you to provide feedback and ask security-related questions. You can sign up for the newsletter at: http://www.microsoft.com/technet/security/secnews/default.mspx * Microsoft has created a free e-mail notification service that serves as a supplement to the Security Notification Service (this e-mail). The Microsoft Security Notification Service: Comprehensive Version. It provides timely notification of any minor changes or revisions to previously released Microsoft Security Bulletins and Security Advisories. This new service provides notifications that are written for IT professionals and contain technical information about the revisions to security bulletins. To register visit the following Web site: http://www.microsoft.com/technet/security/bulletin/notify.mspx * Protect your PC: Microsoft has provided information on how you can help protect your PC at the following locations: http://www.microsoft.com/security/protect/ If you receive an e-mail that claims to be distributing a Microsoft security update, it is a hoax that may be distributing a virus. Microsoft does not distribute security updates through e-mail. You can learn more about Microsoft's software distribution policies here: http://www.microsoft.com/technet/security/topics/policy/swdist.mspx ******************************************************************** THE INFORMATION PROVIDED IN THE THIS EMAIL IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. 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SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES SO THE FOREGOING LIMITATION MAY NOT APPLY. ******************************************************************** ====================================================================== ========================================================= 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 + =========================================================