Check Point VPN-1 UTM Edge Cross-Site Scripting Vulnerability

Sunday, 16 March 2008

			   Louhi Networks
Security Advisory

Advisory: Checkpoint VPN-1 UTM Edge cross-site scripting
Release Date: 2008/03/06
Last Modified: 2008/03/06
Authors: Henri Lindberg, Associate of (ISC)²

Application: Checkpoint VPN-1 Edge W Embedded NGX 7.0.48x
(patched in version 7.5.48)
Devices: Checkpoint VPN-1 UTM Edge
Attack type: Cross site scripting (non-persistent)
Risk: Low
Vendor Status: Vendor has released an updated version


Quote from
"VPN-1 UTM Edge appliances deliver unified threat management to
enterprises with branch offices and simplify security deployments
and manageability. VPN-1 UTM Edge appliances consolidate proven
enterprise-class technology into a single branch office solution
that does not compromise the corporate network and eliminates the
branch office as your weakest link. As part of Check Point's Unified
Security Architecture, VPN-1 UTM Edge can enforce a global security
policy and allows administrators to manage and update thousands of
appliances as easily as managing one."

Insufficient input validation and output encoding on the login page
allows attacker to perform html-injection by posting suitable string
to the login form handler. The injection leads to reflected
pre-authentication cross site scripting.

Form based authentication is used only when device is accessed using
HTTP. Authentication over HTTPS uses HTTP basic authentication.

The device does not accept the parameters in a GET request, POST
request has to be used instead - exploiting the XSS vulnerability
requires therefore a bit more effort compared to ordinary GET based
reflected cross site scripting vulnerability.

The current version can be checked from where is LAN IP
address of the device. The page also displays current product key.

Vendor response:

"Once users register the appliance and connect to the service center
(Safe@Office appliances), the latest firmware is automatically
downloaded to their appliance. For UTM-1 Edge appliances, the latest
firmware version can be downloaded from the Check Point download
center. Currently, this is version 7.5.48 that does not contain the
reported issue. We believe that customers are not exposed to this

Proof of Concept:

<body onload="document.f.submit()">
<form name="f" method="post" action=""

<input name="user" value="'&lt;script/src=//;&lt;/script&gt;">



Update to version 7.5.48

Disclosure Timeline:

19. February 2008 - Contacted Checkpoint by email
20. February 2008 - Vendor response.
6. March 2008 - Advisory was released

Copyright 2008 Louhi Networks Oy. All rights reserved.

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