Document Title:
===============
Avira License Application - Cross Site Request Forgery Vulnerability


References (Source):
====================
http://www.vulnerability-lab.com/get_content.php?id=1302

Video: http://www.vulnerability-lab.com/get_content.php?id=1301


Release Date:
=============
2014-08-28


Vulnerability Laboratory ID (VL-ID):
====================================
1302


Common Vulnerability Scoring System:
====================================
3.4


Product & Service Introduction:
===============================
Avira Operations GmbH & Co. KG is a German multinational and family-owned antivirus software company. With an estimated 9.6% of market 
share according to OPSWAT, and over 100 million customers, Avira was considered the sixth largest antivirus vendor in 2012. Avira competes 
in the antivirus industry against F-Secure, Kaspersky, McAfee, Panda Security, Sophos and Symantec among others. The company supports the 
Auerbach Stiftung, a foundation created by the company`s founder Tjark Auerbach. It promotes charitable and social projects as well as the 
arts, culture and science.

(Copy of the Homepage: http://www.avira.com/de/index )


Abstract Advisory Information:
==============================
An independent Vulnerability Laboratory Researcher discovered a cross site request forgery vulnerability in the official Avira license account system web-application.


Vulnerability Disclosure Timeline:
==================================
2014-08-21:  Researcher Notification & Coordination (Mazen Gamal)
2014-08-22:  Vendor Notification (Avira Security Team)
2014-08-22:  Vendor Response/Feedback (Avira Security Team)
2014-08-22:  Vendor Fix/Patch Notification (Avira Developer Team)
2014-08-28:  Public Disclosure (Vulnerability Laboratory)



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


Affected Product(s):
====================
Avira
Product: License - Web Application Service 2014 Q3


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


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


Technical Details & Description:
================================
A cross site request forgery web vulnerability has been discovered in the official Avira License online-service web-application.
The issue allows attackers to prepare malicious pages with client-side requests to execute internal function without token protection.

The license account system web server of avira uses unvalidted tokens without protection against cross site request forgery attacks.
The researcher discovered an exploit with a POST method request to unauthorized capture session information of an avira user account 
on interaction. The target user with the non expired session can be redirected to a malicious webpage to steal the account information. 
After the account information has been captured the attacker can silently login by usage of the compromised session information. 
The problem is located in the `ajax-update-contact` module of the avira license webpage web-application request.

The security risk of the csrf vulnerability is estimated as medium with a cvss (common vulnerability scoring system) count of 3.4.
Exploitation of the cross site request forgery vulnerability requires no privileged application user account but medium or high 
user interaction. Successful exploitation of the cross site request forgery issue results in account theft.

Request Method(s):
        [+] POST

Vulnerable Service(s):
        [+] Avira - Web Application

Vulnerable Function(s):
        [+] ajax-update-contact

Affected Module(s):
        [+] License Account System - Update


Proof of Concept (PoC):
=======================
The vulnerability can be exploited by remote attackers without privileged application user account and with medium or high user interaction.
For security demonstration or to reproduce follow the provided information and steps below to continue.


PoC: Exploit

    <form id="submit"
action="https://license.avira.com/en/ajax-update-contact"
method="POST">

            <input id="ContactProfileForm[email]"
name="ContactProfileForm[email]" type="hidden"
value="AttackerEmail@gmail.com">
            <input id="callType" name="callType" type="hidden" value="email">
      
      <p class="submit">
        <input type="submit" id="submit" value="submit"/>
      </p>
    </form>


Reference(s):
https://license.avira.com/
https://license.avira.com/en/ajax-update-contact


Solution - Fix & Patch:
=======================
The issue can be patched by a secure implement of a csrf token in connection with the vulnerable account system request.


Security Risk:
==============
The security risk of the cross site request forgery vulnerability in the avira license webpage is estimated as medium.


Credits & Authors:
==================
Mazen Gamal - http://www.vulnerability-lab.com/show.php?user=Mazen%20Gamal


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