Joomla! Language Switcher Module URL Cross-Site Scripting Vulnerability

SECUNIA ADVISORY ID:
SA49678

VERIFY ADVISORY:
Secunia.com
http://secunia.com/advisories/49678/
Customer Area (Credentials Required)
https://ca.secunia.com/?page=viewadvisory&vuln_id=49678

RELEASE DATE:
2012-07-02
DESCRIPTION:
Stefan Schurtz has discovered a vulnerability in Joomla!, which can
be exploited by malicious people to conduct cross-site scripting
attacks.

Input passed via the URL to index.php is not properly sanitised in
modules/mod_languages/tmpl/default.php before being returned to the
user. This can be exploited to execute arbitrary HTML and script code
in a user's browser session in context of an affected site.

Successful exploitation requires the Language Switcher module to be
enabled (not enabled by default).

The vulnerability is confirmed in version 2.5.6. Other versions may
also be affected.

SOLUTION:
No official solution is currently available.

PROVIDED AND/OR DISCOVERED BY:
Stefan Schurtz

ORIGINAL ADVISORY:
http://www.darksecurity.de/advisories/2012/SSCHADV2012-014.txt