Security Basics mailing list archives
Re: Hidden Ports
From: Vincent <pros-n-cons () bak rr com>
Date: Tue, 3 Feb 2004 20:11:48 -0800
On Tue, 03 Feb 2004 15:46:12 -0200 Eduardo Sorensen <ovo () osite com br> wrote:
Can a port scanner not see a port that is opened? The question is: can a backdoor be on a machine, and with nmap -p 1-, for example, you couldn't see it? Thank you, Eduardo
What if the backdoor is set to ignore any address queries other than the owners? For instance I run a mail server at home but even though I do not have a firewall you will not see any service there unless you're on 127.0.0.1 if you try scanning from 10.10.100.1 the service will not respond. ---------------------------------------------------- nmap -sV -p25 127.0.0.1 Starting nmap 3.48 ( http://www.insecure.org/nmap/ ) at 2004-02-03 20:05 PST Interesting ports on hatch.localdomain (127.0.0.1): PORT STATE SERVICE VERSION 25/tcp open smtp Sendmail 8.11.8/8.11.12 ----------------------------------------------------- nmap -sV -p25 10.10.100.1 Starting nmap 3.48 ( http://www.insecure.org/nmap/ ) at 2004-02-03 20:08 PST Interesting ports on nowhere.nex.com (10.10.100.1): PORT STATE SERVICE VERSION 25/tcp closed smtp ----------------------------------------------------- --------------------------------------------------------------------------- Ethical Hacking at InfoSec Institute. Mention this ad and get $720 off any course! All of our class sizes are guaranteed to be 10 students or less. We provide Ethical Hacking, Advanced Ethical Hacking, Intrusion Prevention, and many other technical hands on courses. Visit us at http://www.infosecinstitute.com/securityfocus to get $720 off any course! ----------------------------------------------------------------------------
Current thread:
- Re: Hidden Ports, (continued)
- Re: Hidden Ports David J. Bianco (Feb 04)
- Re: Hidden Ports Michael Painter (Feb 05)
- Re: Hidden Ports David J. Bianco (Feb 05)
- Re: Hidden Ports Michael Painter (Feb 06)
- Re: Hidden Ports Michael Painter (Feb 05)
- Re: Hidden Ports vrsnet (Feb 06)
- Re: Hidden Ports David J. Bianco (Feb 04)
- Necessary ports and not necessary ports Benawi (Feb 05)
- Securing Windows Server 2003 [was: Necessary ports and not necessary ports] Joey Peloquin (Feb 05)
- Re: Necessary ports and not necessary ports JGrimshaw (Feb 06)
- Re: Necessary ports and not necessary ports NSC (Feb 06)
- Re: [work] Hidden Ports opticfiber (Feb 05)
- Re: Hidden Ports Vincent (Feb 06)
- Re: Hidden Ports Alessandro (Feb 04)
- Re: Hidden Ports H Carvey (Feb 05)
- Re: Hidden Ports H Carvey (Feb 06)
- RE: Hidden Ports Dimitri Bertolami (Feb 06)
- Re: Hidden Ports Michael Painter (Feb 09)
- RE: Hidden Ports Aditya [ Aditya Lalit Deshmukh ] (Feb 10)
- RE: Hidden Ports Dimitri Bertolami (Feb 06)