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phpMyFAQ 2.9.0 Cross Site Scripting

phpMyFAQ 2.9.0 Cross Site Scripting
Posted Jun 9, 2016
Authored by Kacper Szurek

phpMyFAQ version 2.9.0 suffers from a persistent cross site scripting vulnerability.

tags | exploit, xss
MD5 | 7b4a39d81777ece41502f1968880743d

phpMyFAQ 2.9.0 Cross Site Scripting

Change Mirror Download
# Exploit Title: phpMyFAQ 2.9.0 Stored XSS
# Date: 09-06-2016
# Software Link: http://www.phpmyfaq.de/
# Exploit Author: Kacper Szurek
# Contact: http://twitter.com/KacperSzurek
# Website: http://security.szurek.pl/
# Category: webapps

1. Description

PHP `filter_input()` function with `FILTER_VALIDATE_URL` flag is used to validate url inside `savefaq` functionality.

But this function doesn’t protect against XSS.

http://security.szurek.pl/phpmyfaq-290-stored-xss.html

2. Proof of Concept

By default every user can propose faq entries.

When admin activate article using http://phpmyfaq/admin/?action=view url or records.defaultActivation option is enabled, XSS will be visible on entry page:

http://phpmyfaq/index.php?action=artikel&cat=%cat_id%&id=%article_id%&artlang=pl

For exploitation use folowing url inside Link for this FAQ field:

http://example.com/"><script>alert("xss")</script>

3. Solution:

Update to version 2.9.1

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