Re: NMAP Switches, -sS, -sT, etc.

["Doug Fox" <dfox168 () hotmail com>]

Tate;

Thanks for sharing your experience/approach wholeheartedly!

DF

----- Original Message ----- 
From: "Tate Hansen" <tate () clearnetsec com>
To: "'Doug Fox'" <dfox168 () hotmail com>
Cc: <pen-test () securityfocus com>
Sent: Friday, March 24, 2006 5:52 PM
Subject: RE: NMAP Switches, -sS, -sT, etc.


> I like to run nmap in phases to balance the speed and accuracy.  For
> example, run only a SYN scan (-sS) for the 1st phase then follow up with 
> the
> service detection, OS detection, etc., scan after you discover the list of
> 'live' devices and open ports.  In my experience those extra options can 
> add
> lots of time (especially when scanning large blocks, like a /16) and I 
> like
> to obtain the open port list as soon as possible to feed others tools 
> (amap,
> nessus, etc.).
>
> I also always try to add options to account for current latency 
> conditions,
> bandwidth availability, and the specs of the server running nmap.  Things
> like: min_hostgroup, min_parallelism, min-rtt-timeout, --max-retries.
>
> An initial scan I may run with high latency (400ms rtt), lots of 
> bandwidth,
> and a good server is:
> nmap -vv -sS -P0 -p 1-65535 -n --min_hostgroup 100 --max_retries 3
> --max_rtt_timeout 1250 --min_parallelism 100 -oA <output_file> <net_block>
>
> For a follow up:
> nmap -vv -p <open_port_list> -sT -A -P0 -n --min_hostgroup 100
> --max_rtt_timeout 1250 --min_parallelism 100 -oA <output_file> -iL
> liveIPList
>
> Another observation:  I frequently find additional open ports when 
> executing
> multiple scans of the same blocks at different times.  For whatever reason
> (e.g. network hiccup, target load, server load) it helps to run repeated
> scans if you want to improve/have greater confidence in your results.
> Running a few SYN services scans in addition to your normal scans at
> different times may reveal a few more open ports.
>
> Tate Hansen
> ClearNet Security
>
> -----Original Message-----
> From: Doug Fox [mailto:dfox168 () hotmail com]
> Sent: Thursday, March 23, 2006 8:07 AM
> To: pen-test () securityfocus com
> Subject: NMAP Switches, -sS, -sT, etc.
>
> If I may, I like to poll the list what are your favorite switches when 
> using
>
> NMAP to conduct "intensive/comprehensive" security testing.
>
> I have been using
>
> NMAP -vv -A -sS -O -p1-65535 -P0 -oX target.xml www.xxx.yyy.zzz.
>
> I find I got more information using -sS than -sT and requires short time.
>
> Any suggestions/comments are appreciated.
>
> Thanks,
>
> DF
>
> ----------------------------------------------------------------------------
> --
> This List Sponsored by: Cenzic
>
> Concerned about Web Application Security?
> As attacks through web applications continue to rise, you need to
> proactively
> protect your applications from hackers. Cenzic has the most comprehensive
> solutions to meet your application security penetration testing and
> vulnerability management needs. You have an option to go with a managed
> service (Cenzic ClickToSecure) or an enterprise software (Cenzic 
> Hailstorm).
>
> Download FREE whitepaper on how a managed service can help you:
> http://www.cenzic.com/forms/ec.php?pubid=10025
> And, now for a limited time we can do a FREE audit for you to confirm your
> results from other product. Contact us at request () cenzic com
> ----------------------------------------------------------------------------
> --

------------------------------------------------------------------------------
This List Sponsored by: Cenzic

Concerned about Web Application Security? 
As attacks through web applications continue to rise, you need to proactively 
protect your applications from hackers. Cenzic has the most comprehensive 
solutions to meet your application security penetration testing and 
vulnerability management needs. You have an option to go with a managed 
service (Cenzic ClickToSecure) or an enterprise software (Cenzic Hailstorm). 
Download FREE whitepaper on how a managed service can help you: 
http://www.cenzic.com/forms/ec.php?pubid=10025
And, now for a limited time we can do a FREE audit for you to confirm your 
results from other product. Contact us at request () cenzic com
------------------------------------------------------------------------------