Secunia

Francesco "aScii" Ongaro has discovered a vulnerability in PmWiki, which can be exploited by malicious people to bypass certain security restrictions, conduct cross-site scripting attacks, disclose sensitive information, and compromise a vulnerable system.

The vulnerability is caused due to an error in the unregister "register_globals" layer in the handling of the "GLOBALS" array parameter. This can e.g. be exploited to include arbitrary files from external and local resources, and execute arbitrary HTML and script code in a user's browser session in context of an affected site.

Example:
http://[victim]/pmwiki.php?GLOBALS&GLOBALS[FarmD]=[file]

Successful exploitation requires that "register_globals" is enabled.

It is also possible to disclose the full path to the installation.

The vulnerability has been confirmed in version 2.0.13 and has also been reported in version 2.1 beta 20. Other versions may also be affected.

Solution
The vulnerability has been fixed in version 2.1 beta 21.
Further details available in Customer Area

Provided and/or discovered by
Francesco "aScii" Ongaro

Changelog
Further details available in Customer Area

Original Advisory
http://www.ush.it/2006/01/24/pmwiki-multiple-vulnerabilities/

Deep Links
Links available in Customer Area