Hash: SHA1

             AUSCERT External Security Bulletin Redistribution

                       ESB-2008.0444 -- [Appliance]
  Motorola Surfboard cable modem cross-site request forgery vulnerability
                               30 April 2008


        AusCERT Security Bulletin Summary

Product:              Motorola Surfboard cable mode
Publisher:            US-CERT
Operating System:     Network Appliance
Impact:               Cross-site Request Forgery
Access:               Remote/Unauthenticated
CVE Names:            CVE-2008-2002

Original Bulletin:    http://www.kb.cert.org/vuls/id/643049

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Vulnerability Note VU#643049

Motorola Surfboard cable modem cross-site request forgery vulnerability


Motorola Surfboard cable modems may contain a cross-site request forgery 
vulnerability that allows an attacker to cause an affected modem to reboot or
reload its configuration.

I. Description

Cable modems are designed to deliver broadband Internet access via unused
bandwidth on a cable television network. Some models of Motorola Surfboard cable 
modems have a web interface that can be used to view log files, check signal 
levels, restart the modem, and reload the modem's configuration. This web 
interface listens on a private (RFC 1918) IP address, and can not be accessed 
via the Internet. Users conntected to the modem's LAN interface access the 
interface via a web browser.

Because the interface uses no authentication, other than binding to a private
IP address, the Motorola Surfboard may be vulnerable to various cross-site 
request forgery (XSRF) vulnerabilities. Note that to exploit these 
vulnerabilities, an attacker would need to convince a user to visit a 
specially crafted web page or open an HTML formatted email.

II. Impact

A remote, unauthenticated attacker may be able to take any action that an 
authorized user can including restarting the cable modem, or forcing it to 
reload its configuration file. While a cable modem is rebooting systems that 
rely on the affected modem will have limited ability to access the Internet.

III. Solution

We are currently unaware of a practical solution to this problem.

Restrict access

Restricting access to the Surfboard's web interface by using proxy filtering 
rules, router access control lists or firewall rules will mitigate this 
vulnerability. To effectively block access, the rules must prevent users on 
the LAN side of the cable modem from connecting to the web interface's IP 
address (usually

Systems Affected

Vendor           Status        Date Updated
Motorola, Inc.  Vulnerable      29-Apr-2008




Thanks to the Rook Security blog for information that was used in this report.

This document was written by Ryan Giobbi.
Other Information
Date Public             17/04/2008
Date First Published    29/04/2008 14:10:15
Date Last Updated       29/04/2008
CERT Advisory    
CVE Name         
US-CERT Technical Alerts         
Metric             13.50
Document Revision  15

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