bugtraq - DefenseCode Security Advisory: Magento Commerce CSRF, Stored Cross Site Scripting #1

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Message-ID: <9fb6a6a4-0d89-05b7-4258-96bb2c4b14af@defensecode.com>
Date: Thu, 5 Oct 2017 11:41:36 +0200
From: DefenseCode <defensecode@...ensecode.com>
To: bugtraq@...urityfocus.com, fulldisclosure@...lists.org,
  websecurity@...appsec.org
Subject: DefenseCode Security Advisory: Magento Commerce CSRF, Stored Cross
 Site Scripting #1

            DefenseCode Security Advisory
   Magento Commerce CSRF, Stored Cross Site Scripting

Advisory ID: DC-2017-09-001
Advisory Title: Magento CSRF, Stored Cross Site Scripting
Advisory URL:
http://www.defensecode.com/advisories/DC-2017-09-001_Magento_CSRF_Stored_Cross_Site_Scripting.pdf

Software: Magento Commerce, CE
Software Language: PHP
Version: Magento CE 1 prior to 1.9.3.6, Magento Commerce prior to
1.14.3.6, Magento 2.0 prior to 2.0.16, Magento 2.1 prior to 2.1.9
Vendor Status: Vendor contacted / Fixed
Release Date: 2017-10-04
Risk: Medium

1. General Overview
===================
During the security audit of Magento Community Edition / Open Source and
Commerce, a Cross-site Request Forgery and Stored Cross-Site Scripting
vulnerabilities were discovered that could lead to administrator account
takeover, putting the website customers and their payment information at
risk.

2. Software Overview
====================
Magento is an ecommerce platform built on open source technology which
provides online merchants with a flexible shopping cart system, as well
as control over the look, content andfunctionality of their online store.
Magento offers powerful marketing, search engine optimization, and
catalog-management tools. It is a leading enterprise-class eCommerce
platform, empowering over 200,000 online retailers.

Homepage:
http://www.magento.com

3. Vulnerability Description
==================================
There is a Cross-Site Request Forgery vulnerability present in Customer
Groups when a POST request is changed to GET on saving changes to existing
groups (/customer/group/save/). When the request method is switched, the
lack of form_key parameter which serves as a CSRF token is completely
ignored.

Group Name parameter (code) is prone to the Stored Cross-Site Scripting
vulnerability and the injected JavaScript code will execute on several
pages when the customer group is shown (on viewing individual orders,
individual customers, etc). An attacker can chain a CSRF attack to
redirecting the admin to one of those pages. Malicious code may lead to
admin session hijacking (although the admin SID cookie is set to HttpOnly,
there are number of ways to retrieve the admin SID on Magento that do not
require cookies). Prerequisite to this attack is that "Add Secret Keys to
URLs" option is disabled.

Proof of concept CSRF + Stored Cross Site Scripting attack can be seen here:
http://www.defensecode.com/advisories/DC-2017-09-001_Magento_CSRF_Stored_Cross_Site_Scripting.pdf

4. Solution
===========
Vendor fixed the reported security issues and released a new version in
September 2017. All users are strongly advised to update to the latest
available version.
https://magento.com/security/patches/magento-2016-and-219-security-update

5. Credits
==========
Discovered by Bosko Stankovic (bosko@...ensecode.com)

6. Disclosure Timeline
======================
05/05/2017    Vendor contacted
09/14/2017    Issue fixed, patch released
10/04/2017    Advisory released to the public

7. About DefenseCode
====================
DefenseCode L.L.C. delivers products and services designed to analyze
and test web, desktop and mobile applications for security
vulnerabilities.

DefenseCode ThunderScan is a SAST (Static Application Security
Testing, WhiteBox Testing) solution for performing extensive security
audits of application source code. ThunderScan SAST performs fast and
accurate analyses of large and complex source code projects delivering
precise results and low false positive rate.

DefenseCode WebScanner is a DAST (Dynamic Application Security
Testing, BlackBox Testing) solution for comprehensive security audits
of active web applications. WebScanner will test a website's security
by carrying out a large number of attacks using the most advanced
techniques, just as a real attacker would.

Subscribe for free software trial on our website
http://www.defensecode.com/ .