Thursday, November 17, 2005

Microsoft Security Advisory: Memory Allocation Denial of Service Via RPC

Via Microsoft.

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.

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