Recommended Practice for Securing Control Systems Modems

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Recommended Practice for Securing Control System Modems January 2008 ABSTRACT This paper addresses an often overlooked backdoor into critical infrastructure Control Systems created by modem connections. A modem s connection to the public telephone system is similar to a corporate network connection to the Internet. By tracing typical attack paths into the system, this paper provides the reader with an analysis of the problem and then guides the reader through methods to evaluate existing modem security. Following the analysis, a series of methods for Securing Modems is provided. These methods are correlated to well-known networking security methods. iii ACKNOWLEDGEMENT This document was developed for the Department of Homeland Security to provide guidance for modem security for Control Systems . The author team consisted of subject matter expertise from the Idaho National Laboratory (James Davidson & Jason Wright) For additional information or comments, please send inquires to the Control Systems Security Program at iv CONTENTS ACKNOWLEDGEMENT.

Recommended Practice for Securing Control System Modems January 2008 . ... VoIP Voice over IP . WAN Wide Area Network . vii . viii. Securing Control System Modems . 1. INTRODUCTION. ... periodic polling/control, and configuration of remote devices and for providing remote connectivity to these systems for engineering

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