phpMyFAQ 2.9.0 Cross Site Scripting

2016.06.10
Credit: Kacper Szurek
Risk: Low
Local: No
Remote: Yes
CVE: N/A
CWE: CWE-79

# 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 doesnt 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

References:

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


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