Snort 2.1 : intrusion detection by Andrew R Baker; Brian Caswell; Mike Poor; et al

By Andrew R Baker; Brian Caswell; Mike Poor; et al

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This approach allows a little more flexibility in defining what “bad” is. Instead of saying, “If you see a string of greater than 500 bytes, filled with a specific character, it is an attack of this type,” you can say, “At this point in the connection, you should not see strings greater than 500 bytes. If you do, it is an attack. ”The problem is that while protocols are tightly and clearly defined, not all vendors choose to pay attention to everything in the protocol definition. As a result, you may find that your protocol analysis-based IDS is correctly complaining about something that is not allowed in the RFC (Request For Comments—the documents used to define most Internet protocols.

Your choice of strategy is a cost/benefit analysis; weigh the time and resources that you are willing to devote to IDSs with the importance of catching the maximum number of attacks. OINK! In reality, most well-planned IDS implementations use a combination of both approaches. Where you can tightly define allowed traffic, use a “known-good” approach. ” Use each where it makes sense and you’ll be a much happier intrusion analyst. com 23 24 Chapter 1 • Intrusion Detection Systems Technologies for Implementing Your Strategy IDSs differentiate attack traffic from innocuous network and system activity in sev­ eral ways.

Com 25 26 Chapter 1 • Intrusion Detection Systems does when it detects an intrusion attempt. Although Chapter 12 will get into this in more detail, it is worth discussing briefly the merits of active IDS response (sometimes mistakenly known as IPS, or Intrusion Prevention Systems) versus the more traditional passive detection and alerting. These alerts can take many forms— Simple Network Management Protocol (SNMP) traps, outgoing e-mails, pages or text messages to the system administrator, even automated phone calls.

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