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Intrusion Detection Systems (IDS)

Intrusion Detection Systems (IDS). Jeramie Reese. Agenda. What is Intrusion Detection? Categorizing IDS Systems IDS Functionality Passive Scans Benefits IDS Products Open Source Project: Snort Conclusion References. What is Intrusion Detection?.

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Intrusion Detection Systems (IDS)

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  1. Intrusion Detection Systems (IDS) Jeramie Reese Jeramie Reese - IDS

  2. Agenda • What is Intrusion Detection? • Categorizing IDS Systems • IDS Functionality • Passive Scans • Benefits • IDS Products • Open Source Project: Snort • Conclusion • References Jeramie Reese - IDS

  3. What is Intrusion Detection? • “An IDS does for a network what an antivirus software package does for files that enter a system.” • “An Intrusion Detection System (IDS) is a system for detecting misuse of network or computer resources.” • Sensors • Connection Requests • Log File Monitors • File Integrity Checker • User Account Auditing Jeramie Reese - IDS

  4. Categorizing IDS Systems • Misuse detection • Anomaly detection • Network-based • Host-based systems • Passive system • Reactive system Jeramie Reese - IDS

  5. IDS Functionality from http://www.snort.org/docs/idspaper/ Jeramie Reese - IDS

  6. Passive Scans • Active (Intrusion Prevention System: IPS) vs. Passive Scans (IDS) • Collect / Analyze Information • Looking for patterns of misuse • Attack Signatures • Authorized users overstepping permissions • Patterns of abnormal activity • Failed password attempts • Access times Jeramie Reese - IDS

  7. Benefits • Early warning of attack • Flexible configuration options • Alerts that a Network Invasion may be in progress • Help identify the source of the incoming probes or attacks • Troubleshoot system anomalies • Determine what has been compromised • Catches insider hacking • Identify attacker (proof) Jeramie Reese - IDS

  8. IDS Products (Commercial) • Cisco Intrusion Detection • Cisco Secure IDS Director Software ($4,900) • Internet Security Systems • Real Secure ($8,995 per sensor) • Symantec Corporation • Intruder Alert (server: $995, workstation: $295) • Tripwire Inc. • Tripwire Manager 2.4 ($6,995) Jeramie Reese - IDS

  9. IDS Products (Open Source) • Naval Surface Warfare Center • Shadow IDS • Originally started by the Cooperative Intrusion Detection Evaluation and Response (CIDER) project • Developer: Stephen P. Berry • Shoki IDS • Developer: Marty Roesch • Snort IDS Jeramie Reese - IDS

  10. Snort • Packet Sniffing • Similar to tcpdump • Packet Monitoring • Useful for network traffic debugging • Intrusion Detection • Applies rules on all captured packets Jeramie Reese - IDS

  11. Snort Rules • Rule Actions • Protocols • IP Addresses • Port Numbers • The Direction Operator • Activate/Dynamic Rules Jeramie Reese - IDS

  12. Snort Rules Examples • log tcp 192.168.1.0/24 <> 192.168.1.0/24 23 (content: "USER root"; msg: "FTP root login";) • alert icmp any any -> any any (msg: “Ping with TTL=100” ttl:100;) • log udp any any -> 192.168.1.0/24 1:1024 • Response: Fast Mode, Full Mode, UNIX Socket Mode, SNMP, SYSLOG, etc. Jeramie Reese - IDS

  13. Conclusion • IDS could benefit from standards • Neighborhood Architecture • IDS itself can be attacked • Altered to report incorrect data • Heuristic data collection • More focus on internal attacks Jeramie Reese - IDS

  14. References • Honeypots; Intrusion Detection, Honeypots and Incident Handling Resources; 2001. http://www.honeypots.net/ids/products • Infosyssec; Intrusion Detection Systems FAQ; 2003. http://www.infosyssec.net/infosyssec/intdet1.htm • Network World Fusion; Buyer's Guide: Network-based intrusion-detection systems; 2001. http://www.networkworld.com/reviews/2001/1008bgtoc.html • Shimonski, Robert J.; What You Need to Know About Intrusion Detection Systems; 2001. http://www.windowsecurity.com/articles/What_You_Need_to_Know_About_Intrusion_Detection_Systems.html Jeramie Reese - IDS

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