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Category:   Device (Router/Bridge/Hub)  >   F5 FirePass Vendors:   F5 Networks
F5 FirePass Input Validation Holes in Multiple Fields Permit Cross-Site Scripting Attacks
SecurityTracker Alert ID:  1016431
SecurityTracker URL:
CVE Reference:   CVE-2006-3550   (Links to External Site)
Updated:  Aug 12 2008
Original Entry Date:  Jul 4 2006
Impact:   Disclosure of authentication information, Disclosure of user information, Execution of arbitrary code via network, Modification of user information
Fix Available:  Yes  Exploit Included:  Yes  
Version(s): Model 4100, Version 5.x
Description:   A vulnerability was 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 cause arbitrary scripting code to be executed by the target user's browser. The code will originate from the site running the F5 FirePass software and will run in the security context of that site. As a result, the code will be able to access the target user's cookies (including authentication cookies), if any, associated with the site, access data recently submitted by the target user via web form to the site, or take actions on the site acting as the target user.

Marc Ruef discovered this vulnerability.

The original advisory is available at:

Impact:   A remote user can access the target user's cookies (including authentication cookies), if any, associated with the site running the F5 FirePass software, access data recently submitted by the target user via web form to the site, or take actions on the site acting as the target user.
Solution:   The report indicates that version 6.x is not affected.
Vendor URL: (Links to External Site)
Cause:   Input validation error

Message History:   None.

 Source Message Contents

Subject:  [Full-disclosure] [scip_Advisory 2352] F5 FirePass 4100 prior 6.x

F5 FirePass 4100 prior 6.x multiple Cross Site Scripting

scip AG Vulnerability ID 2352 (07/04/2006)


F5 FirePass is an appliance which allows a remote communication between 
SSL-VPN endpoints. This secure connectivity to corporate applications 
and data is provided using a standard web browser.

More Information are available on the official FirePass product web site 
at the following URL:


Marc Ruef found several cross site scripting vulnerabilities in the F5 
FirePass 4100 prior 6.x - Other versions might be affected too.

Some writable form fields and hidden fields can be tricked by using 
hyphens to include and execute mobile script code. This flaw can be used 
to pass the code into another users browser session. [1]


Classic script injection techniques within a browser session can be used 
to exploit this vulnerability.

A plugin for our open-source exploiting framework "Attack Tool Kit" 
(ATK) will be published in the near future. [2]


Because authentication frontends are affected too, this vulnerability is 
serious for every secure environment. Non-authenticated users might be 
able to exploit this flaw to gain elevated privileges (e.g. extracting 
sensitive cookie information or launch a buffer overflow attack against 
another web browser).


Detection of web based attacks requires a specialized web proxy and/or 
intrusion detection system. Patterns for such a detection are available 
and easy to implement.


The vulnerabilities have been identified in version 5.x. The remaining 
existence of them could not be verified in version 6.x.


F5 has not been informed because it looks like they have already fixed 
the problem in version 6.x.


scip AG - Security Consulting Information Process (german)

scip AG Vulnerability Database (german) document data base (german)


06/08/06 Identification of the flaw
06/23/06 Falsification in version 6.x
07/04/06 Public advisory


The vulnerability was discovered by Marc Ruef.

     Marc Ruef, scip AG, Zuerich, Switzerland


[1] (german)


Copyright (c) 2006 scip AG, Switzerland.

Permission is granted for the re-distribution of this alert. It may not 
be edited in any way without permission of scip AG.

The information in the advisory is believed to be accurate at the time 
of publishing based on currently available information. There are no 
warranties with regard to this information. Neither the
author nor the publisher accepts any liability for any direct, indirect 
or consequential loss or damage from use of or reliance on this advisory.

Full-Disclosure - We believe in it.
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