From: Ido Dubrawsky (idubraws@cisco.com)
Date: Wed Mar 26 2003 - 19:16:09 EST
On Wed, Mar 26, 2003 at 02:01:44PM -0800, Harlan Carvey wrote:
> Ido,
>
> I would agree that the system needs to be secured, but
> what good does shutting down the system do if you
> loose all of the volatile data, such as running
> processes, network connections, etc? How do you trace
> the issue back to whomever is responsible if you don't
> even know what IP address they're coming from, b/c
> you've lost the volatile data?
>
That's where network packet logging and possibly IDS would be useful. I
agree that capturing the IP source address is important.
>
> I'm not sure I completely understand your reasoning
> here. If you unplug the power from the system, and
> the NIC goes down (due to lack of power), wouldn't the
> system itself shut off? Wouldn't the hard drive stop
> spinning and the CPU no longer process instructions?
>
> If that's the case...how's a logic bomb going to
> execute?
>
Actually, that's what happens when you have two trains of thought in your
head and only write half of each. I meant to say that you should be careful
because the intruder may have set up a logic bomb that if the network inter-
face goes down then the system (or at least his files) get wiped. That's the
reason why it may be better to simply unplug the system at the power source
since then there should (theoretically) be no way for a logic bomb that
triggers on network interface connectivity from wiping the system before you
have a chance to capture the drive image. I was writing on two things and
forgot to make sure I was complete on both of them. Sorry.
Ido
--
===========================================================================
| Ido Dubrawsky E-mail: idubraws@cisco.com
| | | Network Security Architect
:|: :|: | VSEC Technical Marketing, SAFE Architecture Team
:|||: :|||: | Cisco Systems, Inc.
.:|||||||:..:|||||||:. | Silver Spring, MD. 20902
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