bugtraq - eXV2.de Browser Cookie is not properly sanitised

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Date: 13 Aug 2007 08:56:46 -0000
From: webmaster@...-o.org
To: bugtraq@...urityfocus.com
Subject: eXV2.de Browser Cookie is not properly sanitised

Details
=======
Product: eXV2.de CMS <= 2.0.5.
Severity: moderated
Remote-Exploit: yes
Vendor-URL: http://www.exv2.de/
Vendor-Status: informed
Advisory-Status: published

Credits
============
Discovered by: Vision aka n-tier
http://www.i-s-o.org

Original Advisory:
============
http://www.i-s-o.org/security.txt

Introduction
============
eXV2.de CMS is a Content Management System.

More Details
============
1. Cross Site Scripting:
Input passed directly to the "set_lang" parameter in the Browser Cookie is not properly sanitised before being returned to the user.
A user can sent a cookie to himself with ?/set_lang=deutsch and edit it.  
This can be exploited to execute arbitrary HTML and script code in a user's browser session in context of an affected site.

Workaround: [Cross Site Scripting]
=============
Edit the source code to ensure that input is properly sanitised.

Example:

$my_Cookie_Vars =  $_COOKIE;

if (isset($my_Cookie_Vars['set_lang'])){
    if (($my_Cookie_Vars['set_lang'] == "deutsch")||($my_Cookie_Vars['set_lang'] == "english")||($my_Cookie_Vars['set_lang'] == "french")) {                       
        }  else {
            $abuse = true;
            $xoopsConfig['language'] = $xoopsConfig['default_language'];                 
        }    
}   

if ($abuse){
    die("The desired action could not be performed.");
}

History/Timeline
================
7.08.2007 discovery of the vulnerabilities
8.08.2007 additional tests with other versions
10.08.2007 contacted the vendor