Title: Microsoft IIS WebDAV Denial of Service Vulnerability
Severity: MODERATE
Description:
WebDAV is an extension of the HTTP protocol and by default installs on Microsoft IIS 5.0. WebDav enables remote users to manage and collaboratively edit files on remote web servers.
Microsoft IIS is subject to a denial of service attack. Because WebDAV contains a flaw in the handling of certain malformed requests, an attacker submitting multiple malformed WebDAV 'PROPFIND' requests could cause the server to stop responding, leaving the server unable to accept any new HTTP sessions.
The duration of the denial of service is dependant on the amount of time an attacker would continuously send the request. Once the malformed requests come to an end, the server will gain normal functionality.
This vulnerability has also been known to restart the IIS services.
Affected Products:
- Microsoft IIS 5.0
- Microsoft Windows 2000 Advanced Server
- Microsoft Windows 2000 Professional
- Microsoft Windows 2000 Server
References:
- Microsoft: How to Disable WebDAV for IIS 5.0
- Microsoft: Microsoft Security Bulletin (MS01-016)
- Microsoft: Microsoft Security Bulletin MS02-026
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