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XSS vulnerability in Spitfire

Vulnerability ID: HTB22485
Reference: http://www.htbridge.ch/advisory/xss_vulnerability_in_spitfire_2.html
Product: Spitfire
Vendor: Claus Muus ( http://spitfire.clausmuus.de/ ) 
Vulnerable Version: 1.0.336 and Probably Prior Versions
Vendor Notification: 08 July 2010 
Vulnerability Type: 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 "tpl_backup_action.php" script to properly sanitize user-supplied input in "text" 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/cms/edit/tpl_backup_action.php"; method="post" name="main" >
	<input type="hidden" name="action" value="message" />
	<input type="hidden" name="text" value='help text<img src=x onerror=alert(document.cookie)>' />