1、BSI Standards Publication BS ISO/IEC 27033-4:2014 Information technology Security techniques Network security Part 4: Securing communications between networks using security gatewaysBS ISO/IEC 27033-4:2014 BRITISH STANDARD National foreword This British Standard is the UK implementation of ISO/IEC 2
2、7033-4:2014. It supersedes BS ISO/IEC 18028-3:2005 which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee IST/33, IT - Security techniques. A list of organizations represented on this committee can be obtained on request to its secretary. This publication do
3、es not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2014. Published by BSI Standards Limited 2014 ISBN 978 0 580 65101 4 ICS 35.040 Compliance with a British Standard cannot confer immunity from le
4、gal obligations. This British Standard was published under the authority of the Standards Policy and Strategy Committee on 28 February 2014. Amendments issued since publication Date Text affectedBS ISO/IEC 27033-4:2014 Information technology Security techniques Network security Part 4: Securing comm
5、unications between networks using security gateways Technologies de linformation Techniques de scurit - Scurit de rseau Partie 4: Scurisation des communications entre rseaux en utilisant des portails de scurit ISO/IEC 2014 INTERNATIONAL STANDARD ISO/IEC 27033-4 First edition 2014-03-01 Reference num
6、ber ISO/IEC 27033-4:2014(E)BS ISO/IEC 27033-4:2014ISO/IEC 27033-4:2014(E)ii ISO/IEC 2014 All rights reserved COPYRIGHT PROTECTED DOCUMENT ISO/IEC 2014 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any means, ele
7、ctronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below or ISOs member body in the country of the requester. ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel
8、. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in SwitzerlandBS ISO/IEC 27033-4:2014ISO/IEC 27033-4:2014(E) ISO/IEC 2014 All rights reserved iii Contents Page Foreword iv Introduction v 1 Scope . 1 2 Normative references 1 3 T erms and definitions . 1 4 A
9、bbreviated terms 2 5 Structure . 4 6 Overview . 4 7 Security threats 5 8 Security requirements 6 9 Security controls . 8 9.1 Overview 8 9.2 Stateless packet filtering. 8 9.3 Stateful packet inspection . 9 9.4 Application firewall . 9 9.5 Content filtering 10 9.6 Intrusion prevention system and intru
10、sion detection system 10 9.7 Security management API 11 10 Design techniques 11 10.1 Security gateway components 11 10.2 Deploying security gateway controls 12 11 Guidelines for product selection 16 11.1 Overview .16 11.2 Selection of a security gateway architecture and appropriate components 17 11.
11、3 Hardware and software platform.17 11.4 Configuration .17 11.5 Security features and settings .18 11.6 Administration capability .19 11.7 Logging capability .19 11.8 Audit capability20 11.9 Training and education .20 11.10 Implementation types 20 11.11 High availability and operation mode 20 11.12
12、Other considerations 20 Bibliography .22BS ISO/IEC 27033-4:2014ISO/IEC 27033-4:2014(E) Foreword ISO (the International Organization for Standardization) and IEC (the International Electrotechnical Commission) form the specialized system for worldwide standardization. National bodies that are members
13、 of ISO or IEC participate in the development of International Standards through technical committees established by the respective organization to deal with particular fields of technical activity. ISO and IEC technical committees collaborate in fields of mutual interest. Other international organi
14、zations, governmental and non-governmental, in liaison with ISO and IEC, also take part in the work. In the field of information technology, ISO and IEC have established a joint technical committee, ISO/IEC JTC 1. International Standards are drafted in accordance with the rules given in the ISO/IEC
15、Directives, Part 2. The main task of the joint technical committee is to prepare International Standards. Draft International Standards adopted by the joint technical committee are circulated to national bodies for voting. Publication as an International Standard requires approval by at least 75 % o
16、f the national bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO and IEC shall not be held responsible for identifying any or all such patent rights. ISO/IEC 27033-4 was prepared by Joint Technical Committ
17、ee ISO/IEC JTC 1, Information technology, Subcommittee SC 27, IT Security techniques. This first edition of ISO/IEC 27033-4 cancels and replaces ISO/IEC 18028-3:2005, which has been technically revised. ISO/IEC 27033 consists of the following parts, under the general title Information technology Sec
18、urity techniques Network security: Part 1: Overview and concepts Part 2: Guidelines for the design and implementation of network security Part 3: Reference networking scenarios Threats, design techniques and control issues Part 4: Securing communications between networks using security gateways Part
19、 5: Securing communications across networks using Virtual Private Networks (VPNs) Part 6: Securing wireless IP network access (Note that there may be other Parts. Examples of possible topics to be covered by Parts include local area networks, wide area networks, broadband networks, web hosting, Inte
20、rnet email, and routed access to third party organizations. The main clauses of all such Parts should be Risks, Design Techniques and Control Issues.)iv ISO/IEC 2014 All rights reservedBS ISO/IEC 27033-4:2014ISO/IEC 27033-4:2014(E) Introduction The majority of both commercial and government organiza
21、tions have their information systems connected by networks, with the network connections being one or more of the following: within the organization. between different organizations. between the organization and the general public. Further, with the rapid developments in publicly available network t
22、echnology (in particular with the Internet) offering significant business opportunities, organizations are increasingly conducting electronic business on a global scale and providing online public services. The opportunities include the provision of lower cost data communications, using the Internet
23、 simply as a global connection medium, through to more sophisticated services provided by Internet Service Providers (ISPs). This can mean the use of relatively low cost local attachment points at each end of a circuit to full scale online electronic trading and service delivery systems, using web-b
24、ased applications and services. Further, the new technology (including the integration of data, voice and video) increases the opportunities for remote working (also known as teleworking or telecommuting). Telecommuters are able to keep in contact through the use of remote facilities to access organ
25、ization and community networks and related business support information and services. However, while this environment does facilitate significant business benefits, there are new security threats to be managed. With organizations relying heavily on the use of information and associated networks to c
26、onduct their business, the loss of confidentiality, integrity, and availability of information and services could have significant adverse impacts on business operations. Thus, there is a major need to properly protect networks and their related information systems and information. In other words, i
27、mplementing and maintaining adequate network security is critical to the success of any organizations business operations. In this context, the telecommunications and information technology industries are seeking cost- effective comprehensive security solutions, aimed at protecting networks against
28、malicious attacks and inadvertent incorrect actions, thereby meeting the business requirements for confidentiality, integrity, and availability of information and services. Securing a network is also essential to achieve accurate billing for network usage. Security capabilities in products are cruci
29、al 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
30、must be developed in a manner that promotes the interweaving of security capabilities in the overall security solution. The purpose of ISO/IEC 27033-4, Securing communications between networks using security gateways, is to provide guidance on how to identify and analyse network security threats ass
31、ociated with security gateways, define the network security requirements for security gateways based on threat analysis, introduce design techniques to achieve a network technical security architecture to address the threats and control aspects associated with typical network scenarios, and address
32、the issues associated with implementing, operating, monitoring and reviewing network security controls with security gateways. It is emphasized that the ISO/IEC 27033-4 is relevant to all personnel who are involved in the detailed planning, design and implementation of security gateways (for example
33、 network architects and designers, network managers, and network security officers). ISO/IEC 2014 All rights reserved vBS ISO/IEC 27033-4:2014BS ISO/IEC 27033-4:2014Information technology Security techniques Network security Part 4: Securing communications between networks using security gateways 1
34、Scope This part of ISO/IEC 27033 gives guidance for securing communications between networks using security gateways (firewall, application firewall, Intrusion Protection System, etc.) in accordance with a documented information security policy of the security gateways, including: a) identifying and
35、 analysing network security threats associated with security gateways; b) defining network security requirements for security gateways based on threat analysis; c) using techniques for design and implementation to address the threats and control aspects associated with typical network scenarios; and
36、 d) addressing issues associated with implementing, operating, monitoring and reviewing network security gateway controls. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undat
37、ed references, the latest edition of the referenced document (including any amendments) applies. ISO/IEC 27033-1, Information technology Security techniques Network security Part 1: Overview and concepts 3 T erms a nd definiti ons For the purposes of this document, the terms and definitions given in
38、 ISO/IEC 27033-1 and the following apply. 3.1 bastion host specific host with hardened operation system that is used to intercept packets entering or leaving a network and the system that any outsider must normally connect with to access a service or a system that lies within an organizations firewa
39、ll 3.2 e n d - p o i n t s o f t w a r e - b a s e d f i r e w a l l software application running on a single machine, protecting network traffic into and out of that machine to permit or deny communications based on an end user-defined security policy INTERNATIONAL ST ANDARD ISO/IEC 27033-4:2014(E)
40、 ISO/IEC 2014 All rights reserved 1BS ISO/IEC 27033-4:2014ISO/IEC 27033-4:2014(E) 3.3 hardened operating system operating system which has been configured or designed specifically to minimize the potential for comprise or attack Note 1 to entry: This may be a general OS, such as Linux, which has bee
41、n configured for this environment or may be a more custom built solution. 3.4 Internet gateway entry point to access the internet 3.5 packet entity comprising a well-defined block of bytes consisting of header, data and optional trailer which can be transmitted across networks or over telephone line
42、s Note 1 to entry: The format of a packet depends on the protocol that created it. Various communications standards and protocols use special purpose packets to monitor and control a communications session. For example the X.25 standard uses diagnostic, call clear and reset packets (among others), a
43、s well as data packets (or) a unit of data that is transmitted over the network. 3.6 perimeter network physical or logical subnetwork that contains and exposes an organizations external services to a public network 3.7 r emot e of f ic e br a nc h of f ic e office externally connected to the organiz
44、ations main office through remote networks to provide users with services (e.g. file, print and the other service) required to maintain their daily business routine 3.8 single point of failure type of failure that if a part of a system fails, the entire system does not work 3.9 SIP gateway perimeter
45、 device that sits between the internal VoIP network and an external network such as the public telephone network Note 1 to entry: Often a router is used to perform the role. Where VoIP is in use to external IP networks it is important to ensure that the gateway contains sufficient security measures
46、especially dynamic rule base changes to all call setup to take place securely. 4 Abbreviated terms ACL Access Control List API Application Programming Interface ASIC Application Specific Integrated Circuit BGP Border Gateway Protocol CPU Central Processing Unit DDoS Distributed Denial-of-Service2 IS
47、O/IEC 2014 All rights reservedBS ISO/IEC 27033-4:2014ISO/IEC 27033-4:2014(E) DLL Dynamic Link Library DMZ Demilitarized Zone DNS Domain Name Server DoS Denial-of-Service FTP File Transfer Protocol HTTP Hypertext Transfer Protocol HTTPS Hypertext Transfer Protocol over Secure Socket Layer ICMP Intern
48、et Control Message Protocol IDS Intrusion Detection System IP Internet Protocol IPS Intrusion Prevention System ISP Internet Service Provider MIME Multipurpose Internet Mail Extensions NAT Network Address Translation NFS Network File System NIS Network Information System NNTP Network News Transport
49、Protocol NTP Network Time Protocol OS Operating System OSI Open System Interconnection OSPF Open Shortest Path First RIP Routing Information Protocol RPC Remote Procedure Call SIP Session Initiation Protocol SMS Short Message Service S/MIME Secure/Multipurpose Internet Mail Extensions SMTP Simple Mail Transfer Protocol SOAP Simple Object Access Protocol SPA Switched Port Analyzer SPOF Single Point Of Failure SQL Structured Query Language ISO/IEC 2014 All rights reserved 3BS ISO/IEC 27033-4:
