MODX Revolution 2.3.1-pl Cross Site Scripting Vulnerability

Vendor: MODX
Vulnerable Version(s): 2.3.1-pl and probably prior
Tested Version: 2.3.1-pl
Advisory Publication:  August 20, 2014  [without technical details]
Vendor Notification: August 20, 2014 
Vendor Patch: September 11, 2014 
Public Disclosure: September 17, 2014 
Vulnerability Type: Cross-Site Scripting [CWE-79]
CVE Reference: CVE-2014-5451
Risk Level: Low 
CVSSv2 Base Score: 2.6 (AV:N/AC:H/Au:N/C:N/I:P/A:N)
Solution Status: Fixed by Vendor
Discovered and Provided: High-Tech Bridge Security Research Lab ( https://www.htbridge.com/advisory/ ) 

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Advisory Details:

High-Tech Bridge Security Research Lab discovered vulnerability in MODX Revolution, which can be exploited to perform Cross-Site Scripting (XSS) attacks.


1) Reflected Cross-Site Scripting (XSS) in MODX Revolution: CVE-2014-5451

The vulnerability exists due to insufficient sanitization of input data passed via the "a" HTTP GET parameter to "/manager/" URL. A remote attacker can trick a logged-in administrator to open a specially crafted link and execute arbitrary HTML and script code in browser in context of the vulnerable website.
This vulnerability can be used against website administrator to perform phishing attacks, steal potentially sensitive data and gain complete control over web application.

The exploitation example below uses the "alert()" JavaScript function to display "immuniweb" word:

http://[host]/manager/?a=%22%20onload=%22javascript:alert%28/immuniweb/%29;%22%3E

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Solution:

Update "manager/templates/default/header.tpl" file from GitHub.

More Information:
https://github.com/modxcms/revolution/issues/11966
https://github.com/modxcms/revolution/commit/e36f80f18e9514204bf2ce82747c8adf7e47a9c9

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