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Intrusion Detection System(IDS) Overview

Intrusion Detection System(IDS) Overview. Manglers Gopal Paliwal Roshni Zawar SenthilRaja Velu

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Intrusion Detection System(IDS) Overview

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  1. Intrusion Detection System(IDS) Overview Manglers Gopal Paliwal Roshni Zawar SenthilRaja Velu Sreevathsa Sathyanarayana VijayaPriya Mani

  2. Agenda • What is IDS • Why do I need IDS, I have a firewall? • Types of IDS • IDS Techniques • Common ID Framework • Issues in IDS • Popular IDS • Demo • References • Q&A

  3. What is IDS • A system that detects break-ins or misuse of a system in network. • In short, its ‘burglar alarm’ for the network. • An IDS can detect network scans, DoS, unauthorized attempt to connect to services in the network, improper activity etc..

  4. Why do I need IDS, I have a firewall? • Today’s security infrastructure include firewalls, virus scanners, authentication systems, VPN etc.. • Given their role, these are prime targets and being managed by humans, they are error prone. • Failure of one of these tools will jeopardize the security!.

  5. Why do I need IDS, I have a firewall? – Contd.. • Firewall is just not enough. Not all traffic go through them. • Firewall does not protect against application level weaknesses and are subject to attack themselves.

  6. Where should IDS go? Depends primarily on the network setup • In a DMZ area immediately inside firewall. • Important locations in network • On a service host (like a webserver)

  7. Types of IDS • Host Based • Collect and analyze data that originate from a host (e.g., web server) • Network Based • Collect and analyze packets that travel over network • Stack Based (recent) • Integrated into TCP/IP stack, so that the malicious packets are caught even before packets reach application

  8. IDS Techniques • Anomaly Detection • Establish a baseline pattern and generates an alert when a flow of traffic deviates from baseline pattern. • Misuse Detection (or) Signature Detection • Generates an alert when a known intrusion matches existing signatures. Predict and Detect subsequent similar attempts. • Target Monitoring • Corrective control designed to uncover unauthorized action (file modification) after it occurs. • Stealth Probes • Checks for methodical attacks over a prolonged period of time. • Discover correlating attacks.

  9. Common ID Framework

  10. Issues in IDS • Large number of ‘false positives’. • Very difficult to configure the security rules. • Continuous update of signature database is must. • NIDS is unreliable on high-speed and switched networks.

  11. Popular IDS Tools • Snort • Cisco IDS • RealSecure, by Internet Security Systems • Dragon, by Enterasys • NFR, by Flight Recorder (also available in a free research version) • Tripwire, by the Tripwire Open Source team • Tcpwrappers, by Wietse Venema • PortSentry, by Psionic Technologies • AIDE (Advanced Intrusion Detection Environment)

  12. Demo • Snort – is a light weight open source NIDS, capable of performing real time traffic analysis and packet logging. • Snort works in various modes: • sniffer mode (acts as protocol analyzer) • packet-logger mode • NIDS mode.

  13. Network Topology • SNORT • Web server • FTP server • Internal Node supernova (192.168.1.102) milkyway (192.168.1.103) The Intruder trudy (192.168.6.201)

  14. References • Book: Intrusion detection system with snort by Jack koziol • Snort IDS (www.snort.org) • Intrusion Detection Systems (www.certiguide.com/secplus/cg_sp_34IntrustionDetectionSystem.htm) • An introduction to IDS (http://www.securityfocus.com/infocus/1520) • Intrusion Detection FAQ: Why is intrusion detection required in today’s computing environment? (http://www.sans.org/resources/idfaq/id_required.php? • IDS, what is it and why do we need it? (http://www.ixact.ch/english/pagesnav/IN.htm)

  15. Q&A

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