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HTB22911: XSS in Eleanor CMS

Vulnerability ID: HTB22911
Reference: http://www.htbridge.ch/advisory/xss_in_eleanor_cms.html
Product: Eleanor CMS
Vendor: Eleanor CMS ( http://eleanor-cms.ru/ ) 
Vulnerable Version: rc5
Vendor Notification: 22 March 2011 
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:
The vulnerability exists due to failure in the "admin.php" script to properly sanitize user-supplied input in "whereform" variable.
User can execute arbitrary JavaScript code within the vulnerable application.
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:

POST /admin.php HTTP/1.1

Solution: Upgrade to the most recent version