It is a proactive defense measure most likely. Hard to tell what
services are up and running if all the ports return SYN/ACK when scanned
with a SYN scan. This is talked about in "Hacking: The Art of
Exploitation" by Jon Erickson. Very good book. All of this was pointed
out by another fellow member eariler.
-----Original Message-----
From: Don Parker [mailto:hydra291@hotmail.com]
Sent: Sunday, August 29, 2004 4:37 PM
To: asp@webexc.com; pen-test@securityfocus.com
Subject: RE: All tcp ports open?
Hello Ben, it makes absolutely no sense that there is a service
listening on every TCP port at all. Are you sure? Could you perhaps
paste the hping o/p here? Lastly if the handshake are not completed the
connection may not be handed to the internal network if there is a f/w
in front of it, which validates the handshake. More info as to what you
are trying to get past O/S wise as well as network topology would be
most helpful.
Cheers,
Don
----------------------------------------
Don Parker, GCIA
Intrusion Detection Specialist
1.613.302.2910(c)
----------------------------------------
From: Ben Timby <asp@webexc.com>
To: pen-test@securityfocus.com
Subject: All tcp ports open?
Date: Sun, 29 Aug 2004 02:04:08 -0500
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?
Thanks.
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with one of our expert instructors. Check out our Advanced Hacking course,
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taught by an expert instructor with years of in-the-field pen testing
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