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Network Security: Lab#5 Port Scanners and Intrusion Detection System

Network Security: Lab#5 Port Scanners and Intrusion Detection System. J. H. Wang Jun. 16, 2011. Objectives. To learn to use port scanners Nmap To introduce the ideas of intrusion detection system Snort. Packages Used in this Lab. Packages Nmap Snort. Experiment Scenario. Port scanners

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Network Security: Lab#5 Port Scanners and Intrusion Detection System

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  1. Network Security: Lab#5Port Scanners and Intrusion Detection System J. H. Wang Jun. 16, 2011

  2. Objectives • To learn to use port scanners • Nmap • To introduce the ideas of intrusion detection system • Snort

  3. Packages Used in this Lab • Packages • Nmap • Snort

  4. Experiment Scenario • Port scanners • Use port scanners to check the potential weakness in a system • Vulnerable ports • System types

  5. Nmap • Homepage: http://nmap.org/ • Version: • 5.51 • Platforms: Linux/FreeBSD/Windows/MacOS X • Installation steps • Simply follow the instructions on screen

  6. Example Usage for Nmap • Enter an IP address (or hostname) in [Target], and press [Scan] • Open ports will be listed • Type of OS will be detected • Many types of Scans • TCP scan • SYN scan • UDP scan • ACK scan • Window scan • FIN scan • Others: proxy scan, ICMP scan, …

  7. Web-based Port Scanners • Examples • http://viewdns.info/portscan/

  8. Nessus • Homepage: http://www.tenable.com/products/nessus • Latest version: 4.4.1 • Originally open source, but now proprietary by Tenable Network Security • Free to use in homes • Installation skipped

  9. Intrusion Detection Systems • Host-based IDS (HIDS) • To monitor the status of files in a system • File integrity checking, log analysis • E.g. Tripwire, OSSEC • Network-based IDS (NIDS) • To detect the malicious network traffic such as DoS attacks • E.g. Snort

  10. Tripwire • Originally open source, but now commercial • Open source Tripwire available, which is based on previous open-source versions • http://sf.net/projects/tripwire/

  11. OSSEC • Originally open source, but acquired by Trend Micro • Will remain to be open source (as claimed by Trend Micro) • http://www.ossec.net/

  12. Snort • Homepage: http://www.snort.org/ • Latest version: 2.9.0.5 • Platforms: • Linux/Windows • An open-source NIDS, which also requires WinPcap • Installation steps • Simply follow the instructions on screen • Note: In [Installation Options], please check [Enable IPv6 support] for demo of IDS functions

  13. Example Usage for Snort • cd \snort • Sniffer mode: (default) • To show headers only: bin\snort -v • To show headers and data: bin\snort -vd • A more descriptive display: bin\snort -vde • Packet logger mode • To records packets in logging directory: • bin\snort -dev -l log • To log in binary mode • bin\snort -l log -b • To playback the packets in log • bin\snort -r packet.log

  14. Network intrusion detection system mode • bin\snort -l log -c etc\snort.conf • (Some problems with the configuration file to work in Windows…) • You need to understand how to write the rules for intrusion detection…

  15. Summary • Port scanners • Nmap • Intrusion detection system • Snort

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