F5 FirePass Input Validation Holes in Multiple Fields Permit Cross-Site Scripting Attacks
SecurityTracker Alert ID: 1016431|
SecurityTracker URL: http://securitytracker.com/id/1016431
(Links to External Site)
Updated: Aug 12 2008|
Original Entry Date: Jul 4 2006
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|
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:
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.|
The report indicates that version 6.x is not affected.|
Vendor URL: www.f5.com/products/FirePass/ (Links to External Site)
Input validation error|
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. 
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. 
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.
VII. VENDOR RESPONSE
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)
computec.ch document data base (german)
IX. DISCLOSURE TIMELINE
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
 http://www.computec.ch/download.php?list.26 (german)
A2. LEGAL NOTICES
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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