XSS vulnerability in TCMS

Vulnerability ID: HTB22574
Reference: http://www.htbridge.ch/advisory/xss_vulnerability_in_tcms.html
Product: TCMS
Vendor: Target CMS ( http://targetcms.com/ )
Vulnerable Version: 100728 and Probably Prior Versions
Vendor Notification: 09 August 2010
Vulnerability Type: XSS (Cross Site Scripting)
Status: Not Fixed, Vendor Alerted, Awaiting Vendor Response
Risk level: Medium
Credit: High-Tech Bridge SA - Ethical Hacking & Penetration Testing (http://www.htbridge.ch/)

Vulnerability Details:
User can execute arbitrary JavaScript code within the vulnerable application.

The vulnerability exists due to failure in the "php/lib/admin.php" script to properly sanitize user-supplied input in "section" variable. 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.

An attacker can use browser to exploit this vulnerability. The following PoC is available:
http://host/www/index.php?admin=1&section=language"><script>alert(document.cookie)</script>&action=addLanguage