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Category:   Device (Router/Bridge/Hub)  >   F5 FirePass Vendors:   F5 Networks
F5 FirePass Input Validation Holes in 'my.logon.php3' and 'my.activation.php3' Permit Cross-Site Scripting Attacks
SecurityTracker Alert ID:  1019031
SecurityTracker URL:
CVE Reference:   CVE-2007-6704   (Links to External Site)
Updated:  Mar 19 2008
Original Entry Date:  Dec 3 2007
Impact:   Disclosure of authentication information, Disclosure of user information, Execution of arbitrary code via network, Modification of user information
Fix Available:  Yes  Vendor Confirmed:  Yes  Exploit Included:  Yes  
Version(s): 5.4.1 - 5.5.2, 6.0 - 6.0.1; Tested on FirePass 4100
Description:   Two vulnerabilities were reported in F5 FirePass. A remote user can conduct cross-site scripting attacks.

Several scripts do not properly filter HTML code from user-supplied input before displaying the input. A remote user can create a specially crafted URL that, when loaded by a target user, will cause arbitrary scripting code to be executed by the target user's browser. The code will originate from the F5 FirePass device and will run in the security context of that device. As a result, the code will be able to access the target user's cookies (including authentication cookies), if any, associated with the device, access data recently submitted by the target user via web form to the device, or take actions on the device acting as the target user.

Some demonstration exploit URLs are provided:


Impact:   A remote user can access the target user's cookies (including authentication cookies), if any, associated with the F5 FirePass device, access data recently submitted by the target user via web form to the device, or take actions on the device acting as the target user.
Solution:   The vendor has issued a fix (SOL7923).

The F5 advisory is available at:

Vendor URL: (Links to External Site)
Cause:   Input validation error
Underlying OS:  

Message History:   None.

 Source Message Contents

Date:  30 Nov 2007 11:50:04 -0000
Subject:  PR07-15: Cross-site Scripting (XSS) / HTML injection on F5

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


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.


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:


The payload in the example is 


which injects a 'textarea' box

The following PoC HTML page would run JavaScript without any restrictions from a third-party file ('' in this


<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%"


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 (

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


ProCheckUp thanks F5 Networks for working with us.


F5 Networks has issued SOL7923:


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