Penetration Testing mailing list archives
RE: All tcp ports open?
From: "Beaty, Bryan" <Bryan.Beaty () vector com>
Date: Mon, 30 Aug 2004 14:18:13 -0500
I know there is a hardware device that does this. I cannot for the life of me remember the name but I have seen it used by several banks. It intentionally shows all ports open making port scanning almost useless. I would love to know the name of the appliance if anybody knows it. -----Original Message----- From: Todd Towles [mailto:toddtowles () brookshires com] Sent: Monday, August 30, 2004 8:15 AM To: Don Parker; asp () webexc com; pen-test () securityfocus com Subject: RE: All tcp ports open? 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. ----------------------------------------------------------------------- ------- 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. http://www.infosecinstitute.com/courses/ethical_hacking_training.html ----------------------------------------------------------------------- --------
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Current thread:
- Re: All tcp ports open?, (continued)
- Re: All tcp ports open? GUsh-T (Aug 30)
- Re: All tcp ports open? Chris Brenton (Aug 30)
- Re: All tcp ports open? Nathan R. Valentine (Aug 30)
- Re: All tcp ports open? sol seclists (Aug 30)
- RE: All tcp ports open? Don Parker (Aug 29)
- RE: All tcp ports open? Meidinger Chris (Aug 30)
- RE: All tcp ports open? Todd Towles (Aug 30)
- Re: All tcp ports open? David M. Zendzian (Aug 30)
- Re: All tcp ports open? Erik Birkholz (Aug 30)
- Re: All tcp ports open? Bill Burge (Aug 31)
- RE: All tcp ports open? Beaty, Bryan (Aug 30)
- RE: All tcp ports open? BĂ©noni MARTIN (Aug 31)
- RE: All tcp ports open? Altheide, Cory B. (IARC) (Aug 31)
- Re: All tcp ports open? M. D. (Aug 31)