Re: IDS and forensics

From: Knut Eckstein (knutat_private)
Date: Fri Jan 24 2003 - 13:27:41 PST

  • Next message: John L. Clarke, III: "Re: encryption question"

    Carv,
    
    H C <keydet89at_private>
    > What this leads to is the question of how useful such
    > systems are in the face of network forensics.  If the
    > packet contents themselves aren't saved in some way,
    > but only used to trigger an alert, then how suitable
    > are such systems for forensics?  To take a step back,
    > if the signatures themselves aren't viewable, and only
    > the alert, then how does the admin *really* determine
    > what happened?  In most cases, they'd be at the mercy
    > of whatever info the IDS console provides.
    
    you've very precisely hit a weak point of quite a few commercial IDS
    programs. The only thing (I can think of) an admin could do is run a
    sniffer (or another IDS that does record packets) in parallel and
    correlate the results, to find out what really happens "on the wire".
    
    Regards,
    
    Knut
    
    
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