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an overview

Snort is a customizable, open-source Intrusion Detection System (IDS) that actively monitors network traffic for intrusions, matching signatures and sending alerts. Learn about its features, benefits, rules, and installation process.

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an overview

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  1. an overview

  2. Snort is an Intrusion Detection System (IDS) • Automated tools to detect intrusions • Works locally (reactionary) or network wide (preemptive) • Preemptive IDS can use traffic monitoring or content monitoring • Does NOT block intruders. Assumes a human is watching!!!

  3. What IDS are available? • Cisco Secure IDS (Formerly NetRanger) • Network Flight Recorder • Realsecure (ISS) • SecureNet Pro • Snort!!!

  4. Why pick Snort? • “Lightweight” • Free • Portable • Runs on HP-UX, Linux, AIX, Irix, *BSD, Solaris, Win2K • Configurable with easy setup

  5. What can Snort do? • Packet sniffer • Packet Logger • Preemptive IDS • Actively monitors network traffic in real time to match intrusion signatures and send alerts

  6. Rules, Rules, Rules alert udp $EXTERNAL_NET 53 -> $HOME_NET :1024 (msg:"MISC source port 53 to <1024";) • Rule alerts that anything from the external network coming in from port 53 and going to port 1024 should be flagged • Can also alert based on packet content not just source / destination ports

  7. And more Rules • Rules can: Alert, Log, or Pass • Used for IP, UDP, ICMP • Source address / port • Destination address / port • Additional options • This is where content matching can take place

  8. Luckily you probably won’t have to write rules!

  9. What do the alerts look like? [**] MISC source port 53 to <1024 [**] 05/21-16:30:07.697467 129.219.17.200:53 -> 129.219.XXX.XXX:1024 UDP TTL:253 TOS:0x0 ID:60955 IpLen:20 DgmLen:268 DF Len: 248 • These can also be nicely formatted by different parser programs

  10. Installation • Install libcap • Install Snort • # ./configure • # make • # make install • Test • #snort -v

  11. More resources • Snort.org • Securityfocus.com • Whitehats.com

  12. PSCS Implementation By Mark Peoples

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