IDS Intrusion Detection Systems CERT definition: A combination of hardware and software that monitors and collects system and network information and analyzes.

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Presentation transcript:

IDS Intrusion Detection Systems CERT definition: A combination of hardware and software that monitors and collects system and network information and analyzes it to determine if an attack or an intrusion has occurred. Some ID Systems can automatically respond to an intrusion. Two Models _______ Detection Model database of normal activity search for deviations ________ Detection Model database of malicious signatures search for matches

IDS - What Can It Do?  Monitor and analyze user/system/network activities  Audit configuration vulnerabilities  Assess integrity of critical files  Recognize patterns of known attacks  Statistically analyze for abnormal activities  Respond with warnings and/or actions  Install decoy servers (honey pots)  Install vendor patches (some IDS) false positivefalse negative

Two Types of IDS Network-based Intrusion Detection System (NIDS) Host-based Intrusion Detection System (HIDS) Searches for patterns in packets, patterns of packets and packets that don ’ t belong. Can log results or communicate via SMTP/SNMP ____________, analyzers and management consoles Searches for patterns in logs, processes, and/or memory. Can check file integrity (MD5) Observe network traffic flow HID also called ________ Reactive sensors might alter router/firewall rules More extreme response: throttling, session hijacking

Rule-based Appliances Snort Rules alert tcp ! /24 any -> /24 111\ ( content... msg...) log udp any any -> /24 1:1024 alert tcp any any -> /24 ( flags:SF; msg:”possible SYN FIN scan”) pass icmp any any <> /24 (itype:0)

IDS Disadvantages Network-based Intrusion Detection System (NIDS) Host-based Intrusion Detection System (HIDS) An IDS is another tool in the arsenal.

Deployment IDS deployment is only as good as its planning. - Where are sensors located? - Who monitors logs? - How are signatures updated? - What about response planning? CERT response team reporting requirements responsibilities for incident response management of event recording

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