Title: IIS WebDav Lock Method Memory Leak DoS Vulnerability
Severity: HIGH
Description:
Microsoft IIS 5.0 is vulnerable to a denial of service attack.
A flaw in the WebDav extensions (specifically httpext.dll versions prior to 0.9.3940.21) allow a remote attacker to carry out a DoS by repeatedly requesting nonexistent files via the HTTP LOCK method.
This leads to a complete consumption of memory resources, eventually crashing the host and requiring a restart.
Note that an attacker may deliberately prevent the server from restarting, thus indefinitely prolonging the denial of service.
Affected Products:
- Microsoft IIS 5.0
- Microsoft Windows 2000 Advanced Server
- Microsoft Windows 2000 Professional
- Microsoft Windows 2000 Server
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