bugtraq - XSS vulnerability in BLOG:CMS

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Message-Id: <201012151923.oBFJN5kw057758@htbridge.ch>
Date: Wed, 15 Dec 2010 20:23:05 +0100 (CET)
From: advisory@...ridge.ch
To: bugtraq@...urityfocus.com
Subject: XSS vulnerability in BLOG:CMS

Vulnerability ID: HTB22724
Reference: http://www.htbridge.ch/advisory/xss_vulnerability_in_blogcms.html
Product: BLOG:CMS
Vendor: Radek Hulán ( http://blogcms.com/ ) 
Vulnerable Version: 4.2.1.e and probably prior versions
Vendor Notification: 30 November 2010 
Vulnerability Type: Stored XSS (Cross Site Scripting)
Status: Not Fixed, Vendor Alerted
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 "action.php" script to properly sanitize user-supplied input in "body" 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. Enter comment like <script>alert('XSS')</script> in "Add new comment" form.