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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.


Home >> Browse Vulnerability Assessment Database >> Denial of Service >> IIS Malformed Extension Data in URL


Vulnerability Assessment Details

IIS Malformed Extension Data in URL

Vulnerability Assessment Summary
Performs a denial of service against IIS

Detailed Explanation for this Vulnerability Assessment

It was possible to make IIS use 100% of the CPU by
sending it malformed extension data in the URL
requested, preventing him to serve web pages
to legitimate clients.

Solution : Microsoft has made patches available at :
- For Internet Information Server 4.0:
http://www.microsoft.com/Downloads/Release.asp?ReleaseID=20906
- For Internet Information Server 5.0:
http://www.microsoft.com/Downloads/Release.asp?ReleaseID=20904

Network Security Threat Level: High

Networks Security ID: 1190

Vulnerability Assessment Copyright: This script is Copyright (C) 2000 Renaud Deraison

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