Re: All tcp ports open?

["Erik Birkholz" <erik () foundstone com>]

Just a clarification for the list based on Andres' post. 

"I think it should be safe
to say that any *real* program will respond with a banner"

This is not a safe assumption, many services do not respond with a banner. Some common examples are Terminal Server and 
MS SQL Server. 

Btw,  I have seen this behavior when scanning through a sidewinder firewall. The sidewinder has the capability to send 
a tcp syn/ack packet response after droping the inbound packet. Kinda neat, like a deny response but so much better. :)


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-----Original Message-----
From: Andres Riancho <andresit () fibertel com ar>
To: Massimo Cetra <mcetra () navynet it>; 'Ben Timby' <asp () webexc com>; pen-test () securityfocus com <pen-test () 
securityfocus com>
Sent: Mon Aug 30 00:50:21 2004
Subject: Re: All tcp ports open?

Ben ,
    What about "nmap -sV" ?  this will still give you a complete list of
open ports , but also will retrieve the banners. I think it should be safe
to say that any *real* program will respond with a banner , so ,only the
ports with banners will be the ones you should pen-test.

Andres Riancho
  SOC Impsat


----- Original Message ----- 
From: "Massimo Cetra" <mcetra () navynet it>
To: "'Ben Timby'" <asp () webexc com>; <pen-test () securityfocus com>
Sent: Sunday, August 29, 2004 11:10 AM
Subject: RE: All tcp ports open?


> > I am not sure what is doing this, but I assume it is a
> > software (or some
> > kind of) firewall/hids, can anybody point me in the right direction?
> >
> > I am pen-testing a Windows webserver, and a port scan reveals ALL tcp
> > ports open. hping also confirms that a SA is returned for any
> > S packets
> > sent to any port I try. I can connect via netcat any of the
> > ports, and
> > send data, but nothing is returned. In order to verify services, I am
> > required to connect and check for a banner or send
> > appropriate protocol
> > commands to elicit a response.
> >
> > Has anyone seen this, or have any idea of what this is?
>
> http://www.iptables.org/patch-o-matic/pom-extra.html#pom-extra-TARPIT
>
> This is for Linux but may help you finding more informations.
>
> Max
>
>
>
>
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Ethical Hacking at the InfoSec Institute. All of our class sizes are
guaranteed to be 12 students or less to facilitate one-on-one interaction
with one of our expert instructors. Check out our Advanced Hacking course,
learn to write exploits and attack security infrastructure. Attend a course
taught by an expert instructor with years of in-the-field pen testing
experience in our state of the art hacking lab. Master the skills of an
Ethical Hacker to better assess the security of your organization.

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