PostBank Online Banking - Non Persistent XSS Vulnerability

Document Title:
===============
PostBank Online Banking - Non Persistent XSS Vulnerability


References (Source):
====================
http://www.vulnerability-lab.com/get_content.php?id=139


Release Date:
=============
2012-01-25


Vulnerability Laboratory ID (VL-ID):
====================================
139


Product & Service Introduction:
===============================
Online Banking System of Postbank

(Copy from the Vendor Homepage: http://www.postbank.de/)


Abstract Advisory Information:
==============================
Vulnerability Lab Team discovered a non-persistent cross site scripting vulnerability in the online banking system of postbank.


Vulnerability Disclosure Timeline:
==================================
2011-08-01:	Vendor Notification 1
2011-09-01:	Vendor Notification 2
2011-10-01:	Vendor Notification 3
2011-**-**:	Vendor Response/Feedback
2011-**-**:	Vendor Fix/Patch 
2012-01-27:	Public or Non-Public Disclosure



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


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

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


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


Technical Details & Description:
================================
A non-persistent cross site scripting vulnerability is detected on the online banking system of postbank.
The bug is located in the  Kontoauszüge - Preview section of the banking service. The bug allows an attacker 
to hijack customer sessions.

Vulnerable Module(s):
                                         [+] Kontoauszüge Drucken - Gebuchte Umsätze Girokonto  (TAG, MONAT & JAHR)


Proof of Concept (PoC):
=======================
CENSORED:  VENDOR PROTECTION & DISCLOSURE POLICY
QUESTIONS: [email protected]


Solution - Fix & Patch:
=======================
Restrict the value (TAG, MONAT & JAHR) input when processing a request & parse the output to prevent against client side cross site attacks.


Security Risk:
==============
The security risk of the non-persistent vulnerability is estimated as low because of low(+)


Credits & Authors:
==================
Vulnerability Research Laboratory - Benjamin Kunz Mejri (Rem0ve) & Pim J.F.P. Campers (X4lt)


Disclaimer & Information:
=========================
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