--On 30 August 2004 18:04 -0400 "David W. Goodrum" <dgoodrum@nfr.com> wrote:
Hmmmm, I would like verification that either Cisco or Intrushield (or any
other IDS/IPS) can actually capture an entire session from beginning to
end, when the alert was triggered somewhere in the middle, and that they
can do it all the time.
That would certainly be a new feature for Cisco's offering since the last
time I worked with it (Mid-2002).
The only other things that I've seen that are relevant are Niksun's NetVCR
and Snort/sourcefire. At the moment, out of the box, Snort can only capture
subsequent packets in a session or from a source host *after* the
alert-triggering packet (using the 'tag' keyword). I'm currently extending
ACID and FLoP to allow pcap files of tagged alerts to be downloaded from
ACID for analysis using Ethereal or other tools.
The other thing I thought of, after being inspired by Niksun's product, was
to arrange for tethereal to dump to a pair of files (i.e. a double buffer),
switching every n minutes. It would then be possible to arrange for an IDS
to send a signal to tethereal (or rather, some controlling process) when it
generated an interesting alert, telling tethereal to preserve the previous
dump file, and continue logging to the current one until further notice,
giving you upto at least n minutes of reverse 'time travel'.
-dave
David W. Goodrum
Best Regards,
Alex.
--
Alex Butcher: Security & Integrity, Personal Computer Systems Group
Information Systems and Computing GPG Key ID: F9B27DC9
GPG Fingerprint: D62A DD83 A0B8 D174 49C4 2849 832D 6C72 F9B2 7DC9
