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If through a vulnerability assessment, a network security issue is detected for the vulnerability below, applying the appropriate security patches in a timely matter is very important.  If you have detected that your system has already been compromised, following CERT's Network Security recovery document will assist with recommended steps for system recovery.

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IIS 5.0 WebDav Memory Leakage

Vulnerability Assessment Summary Check the presence of a Memory Leakage in the IIS 5 httpext.dll (WebDav). Detailed Explanation for this Vulnerability Assessment The WebDav extensions (httpext.dll) for Internet Information Server 5.0 contains a flaw that may permit a malicious user to consume all available memory on the target server by sending many requests using the LOCK method associated to a non existing filename. This concern not only IIS but the entire system since the flaw can potentially exhausts all system memory available. Vulnerable systems: IIS 5.0 ( httpext.dll versions prior to 0.9.3940.21 ) Immune systems: IIS 5 SP2( httpext.dll version 0.9.3940.21) Solution: Download Service Pack 2/hotfixes from Microsoft web at http://windowsupdate.microsoft.com Network Security Threat Level: High Networks Security ID: 2736 Vulnerability Assessment Copyright: INTRANODE - 2001

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