XSS vulnerability in BEdita

Vulnerability ID: HTB22723
Reference: http://www.htbridge.ch/advisory/xss_vulnerability_in_bedita.html
Product: BEdita
Vendor: Chialab & ChannelWeb ( http://www.bedita.com/ )
Vulnerable Version: 3.0.1.2550 "betula" and probably prior versions
Vendor Notification: 30 November 2010
Vulnerability Type: 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 "bedita-app/controllers/home_controller.php" script to properly sanitize user-supplied input in "searchstring" 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/bedita-app/news/index&quot; method="post" name="main">
<input type="hidden" name="searchstring" value='search"><script>alert(document.cookie)</script>'>
</form>
<script>
document.main.submit();
</script>