AS/NZS ISO/IEC 18028.

3:2006
ISO/IEC 18028-3:2005

AS/NZS ISO/IEC 18028.3:2006
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Australian/New Zealand Standard™
Information technology—Security techniques—IT network security Part 3: Securing communications between networks using security gateways

AS/NZS ISO/IEC 18028.3:2006 This Joint Australian/New Zealand Standard was prepared by Joint Technical Committee IT-012, Information Systems, Security and Identification. It was approved on behalf of the Council of Standards Australia on 23 June 2006 and on behalf of the Council of Standards New Zealand on 30 June 2006. This Standard was published on 4 August 2006.

The following are represented on Committee IT-012: Attorney General’s Department Australian Association of Permanent Building Societies Australian Bankers Association Australian Chamber Commerce and Industry Australian Electrical and Electronic Manufacturers Association Certification Forum of Australia Department of Defence Department of Social Welfare, NZ Government Communications Security Bureau, NZ Internet Industry Association NSW Police Service New Zealand Defence Force Reserve Bank of Australia

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Keeping Standards up-to-date
Standards are living documents which reflect progress in science, technology and systems. To maintain their currency, all Standards are periodically reviewed, and new editions are published. Between editions, amendments may be issued. Standards may also be withdrawn. It is important that readers assure themselves they are using a current Standard, which should include any amendments which may have been published since the Standard was purchased. Detailed information about joint Australian/New Zealand Standards can be found by visiting the Standards Web Shop at www.standards.com.au or Standards New Zealand web site at www.standards.co.nz and looking up the relevant Standard in the on-line catalogue. Alternatively, both organizations publish an annual printed Catalogue with full details of all current Standards. For more frequent listings or notification of revisions, amendments and withdrawals, Standards Australia and Standards New Zealand offer a number of update options. For information about these services, users should contact their respective national Standards organization. We also welcome suggestions for improvement in our Standards, and especially encourage readers to notify us immediately of any apparent inaccuracies or ambiguities. Please address your comments to the Chief Executive of either Standards Australia or Standards New Zealand at the address shown on the back cover.

This Standard was issued in draft form for comment as DR 06259.

AS/NZS ISO/IEC 18028.3:2006

Australian/New Zealand Standard™
This is a free 7 page sample. Access the full version at http://infostore.saiglobal.com.

Information technology—Security techniques—IT network security Part 3: Securing communications between networks using security gateways

First published as AS/NZS ISO/IEC 18028.3:2006.

COPYRIGHT © Standards Australia/Standards New Zealand All rights are reserved. No part of this work may be reproduced or copied in any form or by any means, electronic or mechanical, including photocopying, without the written permission of the publisher. Jointly published by Standards Australia, GPO Box 476, Sydney, NSW 2001 and Standards New Zealand, Private Bag 2439, Wellington 6020

ISBN 0 7337 7668 X

ii

PREFACE
This Standard was prepared by the Joint Standards Australia/Standards New Zealand Committee IT-012, Information Systems, Security and Identification. The objective of this Standard is to provide detailed guidance on the security aspects of the management, operation and use of IT networks, and their inter-connections. Those individuals within an organization that are responsible for IT security in general, and IT network security in particular, should be able to adapt the material in AS/NZS ISO/IEC 18028 series Standards to meet their specific requirements. This Standard is Part 3 of the series and specifically defines techniques for securing for information flows between network using security gateway.
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This Standard is identical with, and has been reproduced from ISO/IEC 18028-3:2005, Information technology—Security techniques—IT network security—Part 3: Securing communications between networks using security gateways. As this Standard is reproduced from an international standard, the following applies: (a) (b) (c) Its number appears on the cover and title page while the international standard number appears only on the cover. In the source text ‘this part of ISO/IEC 18028’ should read ‘this Australian/New Zealand Standard’. A full point substitutes for a comma when referring to a decimal marker.

References to International Standards should be replaced by references to Australian or Australian/New Zealand Standards, as follows: Reference to International Standard ISO/IEC 18028 Information technology—Security techniques—IT network security 18028-4 Part 4: Securing remote access Australian/New Zealand Standard AS ISO/IEC 18028 Information technology—Security techniques—IT network security 18028.4 Part 4: Securing remote access

The term ‘normative’ has been used in this Standard to define the application of the appendix to which it applies. A ‘normative’ appendix is an integral part of a Standard.

ISO/IEC 18028-3:2005(E)

iii

Contents

CONTENTS

Page

Page Foreword............................................................................................................................................................ iv Introduction ........................................................................................................................................................ v 1 2 3 4 5 6 6.1 6.2 6.3 6.4 6.5 7 7.1 7.2 7.3 7.4 8 8.1 8.1.1 8.1.2 8.1.3 8.1.4 8.2 8.2.1 9 9.1 9.2 9.3 9.4 9.5 9.6 9.7 9.8 9.9 9.10 Scope ......................................................................................................................................................1 Normative references ............................................................................................................................1 Terms and definitions ...........................................................................................................................1 Abbreviated terms .................................................................................................................................4 Security requirements ...........................................................................................................................5 Techniques for security gateways .......................................................................................................5 Packet filtering .......................................................................................................................................5 Stateful packet inspection ....................................................................................................................6 Application proxy...................................................................................................................................6 Network Address Translation (NAT) ....................................................................................................6 Content analyzing and filtering ............................................................................................................7 Security gateway components .............................................................................................................7 Switches .................................................................................................................................................7 Routers ...................................................................................................................................................8 Application Level Gateway ...................................................................................................................8 Security Appliances ..............................................................................................................................8 Security Gateway Architectures...........................................................................................................8 Structured approach .............................................................................................................................9 Packet filter firewall architecture .........................................................................................................9 Dual-homed gateway architecture .....................................................................................................10 Screened host architecture ................................................................................................................11 Screened subnet architecture ............................................................................................................12 Staged approach..................................................................................................................................13 Single and multi-staged security gateway architecture ..................................................................14 Guidelines for selection and configuration ......................................................................................16 Selection of a security gateway architecture and appropriate components.................................17 Hardware and software platform........................................................................................................17 Configuration .......................................................................................................................................17 Security features and settings ...........................................................................................................18 Administration......................................................................................................................................19 Logging.................................................................................................................................................19 Documentation.....................................................................................................................................20 Audit ......................................................................................................................................................20 Training and education .......................................................................................................................20 Miscellaneous ......................................................................................................................................20

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Bibliography ......................................................................................................................................................22

© ISO/IEC 2005 – All rights reserved

iii

ISO/IEC 18028-3:2005(E)

iv INTRODUCTION

Introduction
The telecommunications and information technology industries are seeking cost-effective comprehensive security solutions. A secure network should be protected against malicious and inadvertent attacks, and should meet the business requirements for confidentiality, integrity, availability, non-repudiation, accountability, authenticity and reliability of information and services. Securing a network is also essential for maintaining the accuracy of billing or usage information as appropriate. Security capabilities in products are crucial to overall network security (including applications and services). However, as more products are combined to provide total solutions, the interoperability, or the lack thereof, will define the success of the solution. Security must not only be a thread of concern for each product or service, but must be developed in a manner that promotes the interweaving of security capabilities in the overall end-to-end security solution. Thus, the purpose of ISO/IEC 18028 is to provide detailed guidance on the security aspects of the management, operation and use of IT networks, and their inter-connections. Those individuals within an organization that are responsible for IT security in general, and IT network security in particular, should be able to adapt the material in ISO/IEC 18028 to meet their specific requirements. Its main objectives are as follows: ⎯ in ISO/IEC 18028-1, to define and describe the concepts associated with, and provide management guidance on, network security – including on how to identify and analyse the communications-related factors to be taken into account to establish network security requirements, with an introduction to the possible control areas and the specific technical areas (dealt with in subsequent parts of ISO/IEC 18028); ⎯ in ISO/IEC 18028-2, to define a standard security architecture, which describes a consistent framework to support the planning, design and implementation of network security; ⎯ in ISO/IEC 18028-3, to define techniques for securing information flows between networks using security gateways; ⎯ in ISO/IEC 18028-4, to define techniques for securing remote access; ⎯ in ISO/IEC 18028-5, to define techniques for securing inter-network connections that are established using virtual private networks (VPN). ISO/IEC 18028-1 is relevant to anyone involved in owning, operating or using a network. This includes senior managers and other non-technical managers or users, in addition to managers and administrators who have specific responsibilities for Information Security (IS) and/or network security, network operation, or who are responsible for an organization's overall security programme and security policy development. ISO/IEC 18028-2 is relevant to all personnel who are involved in the planning, design and implementation of the architectural aspects of network security (for example IT network managers, administrators, engineers, and IT network security officers). ISO/IEC 18028-3 is relevant to all personnel who are involved in the detailed planning, design and implementation of security gateways (for example IT network managers, administrators, engineers and IT network security officers). ISO/IEC 18028-4 is relevant to all personnel who are involved in the detailed planning, design and implementation of remote access security (for example IT network managers, administrators, engineers, and IT network security officers). ISO/IEC 18028-5 is relevant to all personnel who are involved in the detailed planning, design and implementation of VPN security (for example IT network managers, administrators, engineers, and IT network security officers).

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© ISO/IEC 2005 – All rights reserved

v

INTERNATIONAL STANDARD

1

ISO/IEC 18028-3:2005(E)

AUSTRALIAN/NEW ZEALAND STANDARD

Information technology — Security techniques — IT network security — Part 3: Securing communications between networks using security gateways
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1

Scope

This part of ISO/IEC 18028 provides an overview of different techniques of security gateways, of components and of different types of security gateway architectures. It also provides guidelines for selection and configuration of security gateways. Although Personal Firewalls make use of similar techniques, they are outside the scope of this part of ISO/IEC 18028 because they do not serve as security gateways. The intended audiences for this part of ISO/IEC 18028 are technical and managerial personnel, e.g. IT managers, system administrators, network administrators and IT security personnel. It provides guidance in helping the user choose the right type of architecture for a security gateway which best meets their security requirements.

2

Normative references

The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO/IEC 18028-4:2005, Information technology — Security techniques — IT network security — Part 4: Securing remote access

3

Terms and definitions

For the purposes of this document, the following terms and definitions apply. 3.1 alert ‘instant’ indication that an information system and network may be under attack, or in danger because of accident, failure or people error 3.2 attacker any person deliberately exploiting vulnerabilities in technical and non-technical security controls in order to steal or compromise information systems and networks, or to compromise availability to legitimate users of information system and network resources

© ISO/IEC 2005 – All rights reserved

COPYRIGHT

1

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AS/NZS ISO/IEC 18028.3:2006, Information technology - Security techniques - IT network security Securing communications between networks using security gateways

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