Penetration Testing mailing list archives
Re: [PEN-TEST] IP Tunneling over DNS
From: BMM <bmm () MINDER NET>
Date: Mon, 11 Sep 2000 17:04:30 -0400
It would be less complicated and more comprimising to just do a "ssh -R" to forward a port on an external host/port to local port 23. The traffic coming back in through the tunnel would be nearly identical to a "normal" ssh session, and the remote port could be vulnerable to probing by third parties. One could also ppp over ssh of course, but this would most likely require priviledged access to the local host. Cheers, -Brian On Mon, 11 Sep 2000, Dunker, Noah wrote:
I caught an employee at a customer site using his RedHat workstation to get back in through the firewall. He was using "rtelnet", which is a cheesy tcl (I kid you not) script that connects to a pre-determined IP address's listening port (you listen on that machine with netcat. It tries every <nn> seconds to connect to that port, and when it does, it asks for a passwd. upon password matching, you can fee dthe firewalled internal machine commands almost as if you were in a telnet session (anyone ever seen the port-shell'd /bin/sh in inetd.conf? It works a lot like that.)...
The hard part is finding machines that are running programs such as this one, because of the simple fact that they don't open a listening port. Programs such as these must be found through passive means (I found the suspicious machine while sniffing, messed with the router, and assumed the IP of the machine it was trying to connect to, and discovered it that way.)
-- bmm () minder net 1024/8C7C4DE9
Current thread:
- Re: [PEN-TEST] IP Tunneling over DNS, (continued)
- Re: [PEN-TEST] IP Tunneling over DNS Jose Nazario (Sep 11)
- Re: [PEN-TEST] IP Tunneling over DNS Work, Clinton (Sep 12)
- Re: [PEN-TEST] IP Tunneling over DNS Mark Shlimovich (Sep 12)
- Re: [PEN-TEST] IP Tunneling over DNS Pawel Maciejewski (Sep 12)
- Re: [PEN-TEST] IP Tunneling over DNS matthew patton (Sep 12)
- Re: [PEN-TEST] IP Tunneling over DNS Work, Clinton (Sep 12)
- Re: [PEN-TEST] IP Tunneling over DNS Jonathan Rickman (Sep 11)
- Re: [PEN-TEST] IP Tunneling over DNS Mordechai Ovits (Sep 11)
- Re: [PEN-TEST] IP Tunneling over DNS Andre Delafontaine (Sep 12)
- Re: [PEN-TEST] IP Tunneling over DNS Dunker, Noah (Sep 11)
- Re: [PEN-TEST] IP Tunneling over DNS Mordechai Ovits (Sep 12)
- Re: [PEN-TEST] IP Tunneling over DNS BMM (Sep 12)
- Re: [PEN-TEST] IP Tunneling over DNS Eric Thiel (Sep 12)
- Re: [PEN-TEST] IP Tunneling over DNS Teicher, Mark (Sep 12)
- Re: [PEN-TEST] IP Tunneling over DNS Wolfgang Zenker (Sep 12)
- Re: [PEN-TEST] IP Tunneling over DNS Peter Van Epp (Sep 12)
- Re: [PEN-TEST] IP Tunneling over DNS Jose Nazario (Sep 11)