Title:
======
Avira License - Cross Site Scripting Web Vulnerability


Date:
=====
2013-04-13


References:
===========
http://www.vulnerability-lab.com/get_content.php?id=916

Avira Case-ID #99287655


VL-ID:
=====
916


Common Vulnerability Scoring System:
====================================
1.5


Introduction:
=============
Avira Operations GmbH & Co. KG is a German multinational and family-owned antivirus software company. With an estimated 9.6% of the 
global market share according to OPSWAT, and over 100 million customers, Avira is considered the sixth largest antivirus vendor worldwide.
The company supports the Auerbach Stiftung, a foundation created by the company`s founder and CEO, Tjark Auerbach. It promotes charitable 
and social projects as well as the arts, culture and science.

(Copy of the Homepage: http://en.wikipedia.org/wiki/Avira )


Abstract:
=========
The independent laboratory researcher (Ebrahim Hegazy) discovered a client side web vulnerability in the official Avira license company web application service.


Report-Timeline:
================
2013-04-08:     Researcher Notification & Coordination
2013-04-10:     Vendor Notification
2013-04-10:     Vendor Response/Feedback
2013-04-12:     Vendor Fix/Patch
2013-04-13:     Public Disclosure


Status:
========
Published


Affected Products:
==================
Avira
Product: License - Web Application Service 2013 Q1


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


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


Details:
========
A client side cross site scripting web vulnerability is detected in Googles DoubleClick company web application service.
The vulnerability allows remote attackers to form manipulated urls to inject script code on client side application requests.

The client side cross site scripting web vulnerability is located in the license section when processing to request the 
login file form via GET with a manipulated ff (value) parameter.  

Exploitation of the vulnerability does not require a privileged application user account but low or medium user interaction.
Successful exploitation results in client side cross site requests, unauthorized external redirects, client side phishing, 
client side session hijacking and client side module context manipulation.

Vulnerable Service(s):
        [+] Avira - Licenses (https://license.avira.com)

Vulnerable Module(s):
        [+] login

Vulnerable Parameter(s):
        [+] ff


Proof of Concept:
=================
The cross site web vulnerability can be exploited by remote attackers without privileged application user account and with low or medium user interaction.
For demonstration or reproduce ...

Payload: 
"><iframe src="http://test.de/Avira/avira.html" height=345 width=345></iframe>

POC:
https://license.avira.com/en/login?ff=web%22%"><iframe src="http://test.de/Avira/avira.html" height=345 width=345></iframe>%22%3E%3C/iframe%3E


Solution:
=========
Input should be validated as strictly as possible on arrival and user input should be secure encoded with html special chars at any point 
where the context gets copied into application response.


Risk:
=====
The security risk of the client side cross site scripting web vulnerability is estimated as low(+).


Credits:
========
Vulnerability Laboratory [Research Team] - Ebrahim Hegazy [hegazy@vulnerability-lab.com] (research@vulnerability-lab.com)


Disclaimer:
===========
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