Adrian Pastor and Amir Azam have discovered a vulnerability in Apache, which can be exploited by malicious people to conduct cross-site scripting attacks.

Input passed via the HTTP method is not properly sanitised before being returned to the user when displaying a "413 Request Entity Too Large" error page. This can be exploited to execute arbitrary HTML and script code in a user's browser session in context of an affected site.

The vulnerability is confirmed in version 2.2.4 and reported in versions 2.0.46, 2.0.51, 2.0.55, 2.0.59, and 2.2.3. Other versions may also be affected.

NOTE: Exploiting the vulnerability might be dependent on the Flash player version installed on the target machine.

For more information:
SA21172

Solution
Add a "ErrorDocument 413" statement to the Apache config file.

Provided and/or discovered by
Adrian Pastor and Amir Azam, ProCheckUp

Changelog
Further details available to Secunia VIM customers

Original Advisory
http://procheckup.com/Vulnerability_PR07-37.php

Other references
Further details available to Secunia VIM customers

Deep Links
Links available to Secunia VIM customers