| Publisher | Sourcefire | ||
|---|---|---|---|
| Format | 419.3KB PDF | Date added | 03 Aug 2007 |
| Topics | TCP - IP | ||
| Downloads | 0 | ||
In their landmark 1998 paper, "Insertion, Evasion, and Denial of Service: Eluding Network Intrusion Detection," Thomas Ptacek and Timothy Newsham exposed some weaknesses in Intrusion Detection Systems (IDS). The authors revealed that intrusion detection systems cannot be effective and accurate because they do not necessarily process, or perhaps, even observe network traffic exactly as the destination host that receives the message does. This flaw exists in several layers of evaluation and processing of the packets including the IP, TCP, and application layers. As an example of the problem, consider traffic that has overlapping TCP segments that are sent to a given host.
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