Avira License Cross Site Scripting

`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 [[email protected]] ([email protected])  
  
  
Disclaimer:  
===========  
The information provided in this advisory is provided as it is without any warranty. Vulnerability-Lab disclaims all warranties,   
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may not apply. We do not approve or encourage anybody to break any vendor licenses, policies, deface websites, hack into databases   
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Copyright © 2013 | Vulnerability Laboratory  
  
  
  
--   
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LABORATORY RESEARCH TEAM  
CONTACT: [email protected]  
  
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