HTB22958: XSS in phpGraphy

[advisory () htbridge ch]

Vulnerability ID: HTB22958
Reference: http://www.htbridge.ch/advisory/xss_in_phpgraphy.html
Product: phpGraphy 
Vendor: http://phpgraphy.sourceforge.net/ ( http://phpgraphy.sourceforge.net/ ) 
Vulnerable Version: 0.9.13b
Vendor Notification: 14 April 2011 
Vulnerability Type: XSS (Cross Site Scripting)
Risk level: Medium 
Credit: High-Tech Bridge SA Security Research Lab ( http://www.htbridge.ch/advisory/ ) 

Vulnerability Details:
User can execute arbitrary JavaScript code within the vulnerable application.
The vulnerability exists due to failure in the "/themes/default/header.inc.php" script to properly sanitize 
user-supplied input in "theme_dir" variable then register_globals on. 
Successful exploitation of this vulnerability could result in a compromise of the application, theft of cookie-based 
authentication credentials, disclosure or modification of sensitive data.

The following PoC is available:  


http://[host]/themes/default/header.inc.php?theme_dir=%22%3E%3Cscript%3Ealert%28document.cookie%29;%3C/script%3E