RE: Odd scans and stuff bouncing off firewalls

[Steve Vawter <svawter () sigma net>]

Another reason (other than using the numbers for cash) that I can see is 
that they might better help decipher where an attack that made it 
through the filters came from. If you only have the few packets that 
made it through to use to backtrack to an attacker, it may be harder to 
find them.

But, of course, without the right data filters, finding the pattern in 
the chaos is near impossible sometimes...

-------- Original Message --------
Subject: Odd scans and stuff bouncing off firewalls
Date: Tue 8/13/2002 8:58 AM
From: Nexus [nexus () patrol i-way co uk]
To: incidents () securityfocus com


Just a quick straw poll to see if anyone has any hard data that supports 
the logging and analysis of traffic that bounces off of filtering devices as
part of a business security plan ? Other than generating attack metrics to
wave under the noses of senior managment at budget time, is there any 
definite _business_ requirement to have IDS sensors outside the firewall 
or firewall "drop" logs et al regularly examined in the context of 
"external" attack sources ?

"We defended against X bazillion hack attacks last year so we need a 
bigger budget for more stuff.." BableFish (H2G2 version) : "Tons of port 
scans and worms from non accountable netblocks bounced off of the firewall"

I don't bother to chase anything from anywhere unless it makes it 
through the filters because I could care less and it would IMHO purely 
be a time sink and even then only if it's from a netblock that has a 
whois abuse@
entry. As I said, this is purely my own view, on my own network knowing
the sheer amount of background radiation on the internet, so I would 
appreciate some other points of view.

Cheers.
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