Title: Microsoft IIS WebDAV Invalid Request Denial of Service Vulnerability
Severity: MODERATE
Description:
WebDAV is an extension of the HTTP protocol and is installed by default with 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 unusually long malformed requests, an attacker submitting such a request 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 dependent on the actual length of the request. Once the malformed request comes to an end, the server will restart itself and regain normal functionality.
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 MS01-044
- Microsoft: Microsoft Technet Security
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