Re: Connecting to different services with source port 53

From: Daniel Uriah Clemens (superman@packetninjas.org)
Date: Mon Jul 04 2005 - 20:58:01 EDT


You could use the following tools for this:

Fpipe - http://www.foundstone.com/resources/termsofuse.htm?file=fpipe2_1.zip
Tcpr - could also help you out.
TCPRedirector (gui) - http://hp.vector.co.jp/authors/VA005851/soft/tcp-redirector/index-eng.html

Also check out http://revinetd.sourceforge.net/

I hope this helps you out.
You could also write a small perl script that does something like

---->snip<-------
#!/bin/sh
echo "Enter Target"
read target
nc -p 53 $target 80
-->snip<-----------

If you add in a few loops to do incremential ports to scan for this would be a real easy way to do this while
not having to use other tools.

Whatever your poison. :)

Hope this helps out.

->I'm pen-testing a system and with a normal "nmap -sS" I get no
->response. If I change the source port I could get through to
->the system, as you can see.

Awesome! Good find!

->Is there a way, how I can establish a connection using source
->port 53?

-- 
-Daniel Uriah Clemens
Esse quam videra
                (to be, rather than to appear)
                     -Moments of Sorrow are Moments of Sobriety
                      { o)2059686335             c)2055676850 }
{Fingerprint C5B8 DB37 CC77 3C2B 0027  D2A6 D766 1F0E FE27 ADC8 }
 




This archive was generated by hypermail 2.1.7 : Sat Apr 12 2008 - 10:54:31 EDT