XSS vulnerability in eazyCMS

Vulnerability ID: HTB22553
Reference: http://www.htbridge.ch/advisory/xss_vulnerability_in_eazycms.html
Product: eazyCMS
Vendor: eazycms.com ( http://eazycms.com/ )
Vulnerable Version: Current at 28.07.2010 and Probably Prior Versions
Vendor Notification: 28 July 2010
Vulnerability Type: XSS (Cross Site Scripting)
Status: Fixed by Vendor
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 "eazycms.php" script to properly sanitize user-supplied input in "page_id" 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://admin.host/eazycms.php?action=&page_id=2%22%3E%3Cscript%3Ealert%28document.cookie%29%3C/script%3E

Solution: As this is an online service, there is no need to upgrade. Changes are live from time of publication.