Re: Re: Possible Evasion in Snort Multi Pattern Algorithm

[Jason <security () brvenik com>]

Joel Esler wrote:
> Follow-up to this being:
>
> Can a Soucefire person explain the different search methods and their  
> impact?

net net is

mwm has a bug that allows evasion - patched in 2.4
ac does not

mwm requires less memory
ac likes more memory

There is a whole lot of stuff involved in pattern matching that smarter 
people than I like to get into. You should check out the white papers on 
snort.org if you want more detail though

* Optimizing Pattern Matching for Intrusion Detection
* Snort 2.0 - Multi-Rule Inspection Engine
* Snort 2.0 - Rule Optimizer


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