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phpMyFAQ 2.9.0 Cross Site Scripting

🗓️ 09 Jun 2016 00:00:00Reported by Kacper SzurekType 
packetstorm
 packetstorm
🔗 packetstormsecurity.com👁 13 Views

PHP function `filter_input()` used for URL validation in phpMyFAQ 2.9.0 allows stored XSS, enabling attack through faq entries activation. Update to 2.9.

Code
`# 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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09 Jun 2016 00:00Current
0.1Low risk
Vulners AI Score0.1
13