RE: Mapping Class A network ( any easy trick?)

["Moonen, Ralph" <Moonen.Ralph () kpmg nl>]

Hi,

Apart from the timing issues (I agree totally) I still think that you
cannot call nmap+nbtstat or nmap+nessus or whatever combinatioin
'penetration testing'. To me that is Vulnerability Analysis. VA on a
class A is tricky enough. Pentesting (ie attempted exploitation of all
discovered vulenrabilities) on a full class A is extremely difficult.
Impossible for 1 man and his laptop, given average population of
networks. 

I assume that stealth is not an issue here, and if indeed not, then my
choice for the mapping and scanning would be to have a few lappies (like
your setup) crunch away unattendend (but with humans on call 24/7) for
as long as it takes. For the actual testing (exploiting) I usually
concentrate on the business critical environments and the devices that
those environments most heavily depend on. No use pentesting each and
every workstation. 

But usually, it never gets that far. You find so much sh*t during the
first scans and so when you've totally 0wn3d the SAP environment within
half a day it's pretty clear what needs to happen first. 

--Ralph


-----Original Message-----
From: Tim [mailto:tim-pentest () sentinelchicken org] 
Sent: woensdag 9 februari 2005 18:10
To: Moonen, Ralph
Cc: John Thomas; pen-test () securityfocus com
Subject: Re: Mapping Class A network ( any easy trick?)

--- Virus checked / op virussen gecontroleerd ---

> You might also want to manage expectations. Pentesting a full class A,

> even given low population of the network will take you months. I think

It can be done faster.

Once upon a time I built a system with primarily shell/python/perl which
used nmap and nbtscan to scan all RFC1918 addresses in a large company.
With a LOT of timing optimization options, and a very focused set of
ports we were scanning for, we were able to scan this many IPs in 2-3
days.  However, we had to distribute the scan across 8 linux machines,
each of which ran 4 scanning threads in parallel.  We didn't utilize any
broadcasts, of course.

It is a pain, and I don't recommend doing it unless you have a good
reason, but it can be done with enough effort.

The more recent versions of nmap supposedly has a more efficient
scanning engine.  Definately use the newest stuff.

tim

ps- Our scanning network could scan 300+ IPs/sec on average (majority of
IPs didn't have hosts, of course) and during the scan, a few older
firewalls tipped over.  Be careful.


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