Andrew Moise has reported a vulnerability in TWiki, which can be exploited by malicious, local users to gain escalated privileges.

The vulnerability is caused due to the program loading and executing CGI session files from a temporary directory (by default the world-writable "/tmp"). This can be exploited by creating a specially crafted CGI session file in the directory, which causes it to be loaded and executed as Perl code with the privileges of the web server under unspecified circumstances.

NOTE: It is possible to exploit this by running malicious CGI or PHP scripts on a shared server where another customer runs TWiki.

The vulnerability is reported in 4.x versions prior to 4.1.1 and in TWiki SessionPlugin prior to 2.992.

Solution
Update to version 4.1.1 or TWiki SessionPlugin 2.992.

Provided and/or discovered by
Andrew Moise

Original Advisory
http://twiki.org/cgi-bin/view/Codev/SecurityAlert-CVE-2007-0669

Other references
Further details available in Customer Area

Deep Links
Links available in Customer Area