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  • 1. Special Publication 800-94Guide to Intrusion Detectionand Prevention Systems(IDPS)Recommendations of the National Instituteof Standards and TechnologyKaren ScarfonePeter Mell
  • 2. NIST Special Publication 800-94 Guide to Intrusion Detection and Prevention Systems (IDPS) Recommendations of the National Institute of Standards and Technology Karen Scarfone Peter Mell C O M P U T E R S E C U R I T Y Computer Security Division Information Technology Laboratory National Institute of Standards and Technology Gaithersburg, MD 20899-8930 February 2007 U.S. Department of Commerce Carlos M. Gutierrez, Secretary Technology Administration Robert C. Cresanti, Under Secretary of Commerce for Technology National Institute of Standards and Technology William Jeffrey, Director
  • 3. GUIDE TO INTRUSION DETECTION AND PREVENTION SYSTEMS (IDPS) Reports on Computer Systems TechnologyThe Information Technology Laboratory (ITL) at the National Institute of Standards and Technology(NIST) promotes the U.S. economy and public welfare by providing technical leadership for the nationsmeasurement and standards infrastructure. ITL develops tests, test methods, reference data, proof ofconcept implementations, and technical analysis to advance the development and productive use ofinformation technology. ITLs responsibilities include the development of technical, physical,administrative, and management standards and guidelines for the cost-effective security and privacy ofsensitive unclassified information in Federal computer systems. This Special Publication 800-seriesreports on ITLs research, guidance, and outreach efforts in computer security and its collaborativeactivities with industry, government, and academic organizations. National Institute of Standards and Technology Special Publication 800-94 Natl. Inst. Stand. Technol. Spec. Publ. 800-94, 127 pages (February 2007) Certain commercial entities, equipment, or materials may be identified in this document in order to describe an experimental procedure or concept adequately. Such identification is not intended to imply recommendation or endorsement by the National Institute of Standards and Technology, nor is it intended to imply that the entities, materials, or equipment are necessarily the best available for the purpose. iii
  • 4. GUIDE TO INTRUSION DETECTION AND PREVENTION SYSTEMS (IDPS) AcknowledgementsThe authors, Karen Scarfone and Peter Mell of the National Institute of Standards and Technology(NIST), wish to thank their colleagues who reviewed drafts of this document and contributed to itstechnical content. The authors would like to acknowledge John Connor, Tim Grance, Anoop Singhal, andMurugiah Souppaya of NIST; Michael Gerdes, Ralph Martins, Angela Orebaugh, and Mike Zeberlein ofBooz Allen Hamilton; and Steve Sharma of Project Performance Corporation for their keen and insightfulassistance throughout the development of the document. The authors particularly want to thank RebeccaBace of KSR for her careful review of the publication and for her work on the predecessor publication,NIST Special Publication 800-31, Intrusion Detection Systems. The authors would also like to expresstheir thanks to security experts Andrew Balinsky (Cisco Systems), Anton Chuvakin (LogLogic), JayEnnis (Network Chemistry), John Jerrim (Lancope), and Kerry Long (Center for Intrusion Monitoringand Protection, Army Research Laboratory), as well as representatives from the Department of State andGartner, for their particularly valuable comments and suggestions. Additional acknowledgements will beadded to the final version of the publication. TrademarksAll product names are registered trademarks or trademarks of their respective companies. iv
  • 5. GUIDE TO INTRUSION DETECTION AND PREVENTION SYSTEMS (IDPS) Table of ContentsExecutive Summary..............................................................................................................ES-11. Introduction ......................................................................................................................1-1 1.1 Authority...................................................................................................................1-1 1.2 Purpose and Scope .................................................................................................1-1 1.3 Audience ..................................................................................................................1-1 1.4 Document Structure .................................................................................................1-12. Intrusion Detection and Prevention Principles .............................................................2-1 2.1 Uses of IDPS Technologies .....................................................................................2-1 2.2 Key Functions of IDPS Technologies ......................................................................2-2 2.3 Common Detection Methodologies..........................................................................2-3 2.3.1 Signature-Based Detection...........................................................................2-4 2.3.2 Anomaly-Based Detection ............................................................................2-4 2.3.3 Stateful Protocol Analysis.............................................................................2-5 2.4 Types of IDPS Technologies ...................................................................................2-6 2.5 Summary..................................................................................................................2-73. IDPS Technologies...........................................................................................................3-1 3.1 Components and Architecture .................................................................................3-1 3.1.1 Typical Components.....................................................................................3-1 3.1.2 Network Architectures ..................................................................................3-1 3.2 Security Capabilities ................................................................................................3-2 3.2.1 Information Gathering Capabilities ...............................................................3-2 3.2.2 Logging Capabilities .....................................................................................3-2 3.2.3 Detection Capabilities...................................................................................3-3 3.2.4 Prevention Capabilities.................................................................................3-4 3.3 Management ............................................................................................................3-4 3.3.1 Implementation .............................................................................................3-4 3.3.2 Operation and Maintenance .........................................................................3-6 3.3.3 Building and Maintaining Skills .....................................................................3-9 3.4 Summary................................................................................................................3-104. Network-Based IDPS........................................................................................................4-1 4.1 Networking Overview ...............................................................................................4-1 4.1.1 Application Layer ..........................................................................................4-1 4.1.2 Transport Layer ............................................................................................4-2 4.1.3 Network Layer ..............................................................................................4-2 4.1.4 Hardware Layer ............................................................................................4-3 4.2 Components and Architecture .................................................................................4-3 4.2.1 Typical Components.....................................................................................4-3

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