var-200012-0155
Vulnerability from variot

IIS 5.0 allows remote attackers to execute arbitrary commands via a malformed request for an executable file whose name is appended with operating system commands, aka the "Web Server File Request Parsing" vulnerability. Thus, a malicious user may perform system commands through cmd.exe under the context of the IUSR_machinename account which could possibly lead to privilege escalation, deletion, addition, and modification of files, or full compromise of the server. In order to establish successful exploitation, the file requested must be an existing .bat or .cmd file residing in a folder that the user possesses executable permissions to. Update (November 27, 2000): Georgi Guninski has discovered new variants of this vulnerability that have appeared after applying the patch (Q277873) supplied by Microsoft. Please see 'Exploit' for further details. Update (December 7, 2000): Billy Nothern has discovered that the commands can also be parsed through ActiveState Perl. Please see his Bugtraq posted located under 'Credit' for further information. UPDATE: It is believed that an aggressive worm may be in the wild that actively exploits this vulnerability

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