Title: Microsoft IIS Multiple Invalid URL Request DoS Vulnerability
Severity: HIGH
Description:
Due to the way Microsoft IIS handles specially formed URLs, IIS is subject to a denial of service condition.
Due to a flaw in the implementation of a specific code module installed by default in IIS 5.0, requesting a specially crafted URL of a specific length multiple times could cause the service to fail.
This problem in IIS is caused by a memory allocation error, which leads to an access violation error when repeated multiple times.
A restart of the service is required in order to gain normal functionality.
Successful exploitation of this vulnerability could assist in further attacks against the victim host.
Affected Products:
- Microsoft IIS 5.0
- Microsoft Windows 2000 Advanced Server
- Microsoft Windows 2000 Professional
- Microsoft Windows 2000 Server
References:
- Microsoft: Microsoft Security Bulletin (MS01-014)
- Microsoft: Microsoft Security Bulletin MS02-026
- eSecurityOnline: Microsoft Internet Information Server/ Exchange 2000 invalid request denial of s
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