XSS vulnerability in eazyCMS

[advisory () htbridge ch]

Vulnerability ID: HTB22557
Reference: http://www.htbridge.ch/advisory/xss_vulnerability_in_eazycms_4.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 "indexcms.php" script to properly sanitize user-supplied input in 
"username" 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/indexcms.php?error_code=-1&username=1%22%3E%3Cimg+src=x+onerror=alert%28document.cookie%29%3E

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