Full Disclosure mailing list archives
Re: ICMP Covert channels question
From: Paul Schmehl <pauls () utdallas edu>
Date: Fri, 28 Jan 2005 18:04:15 -0600
--On Friday, January 28, 2005 11:45:00 PM +0100 cyberpixl <cyberpixl () gmail com> wrote:
Assume there is a local machine (our target) with ip 192.168.0.2 that is connected to the internet using a router 192.168.0.1/88.88.88.88 (that is not blocking icmp packets) and my machine is say, 33.33.33.33. If i then send an icmp packet to the 88.88.88.88 router with source ip set to 192.168.0.2, would it forward that packet to the host in its local network, or will it discard it? Is there any way to deliver my packet to that local machine?
No, because non-routeable addresses are...well....non-routeable. The only exception to this is *if* the target machine already had a session going with 33.33.33.33 (and it would obviously be nat'd/pat'd) there is a snort time frame within with your icmp packet would be delivered because the firewall is still translating the address/port for that session.
Of course you have to know in advance all those variables, so, since you're sitting right there, just pound the dern thing with a hammer and be done with it. :-)
Paul Schmehl (pauls () utdallas edu) Adjunct Information Security Officer The University of Texas at Dallas AVIEN Founding Member http://www.utdallas.edu _______________________________________________ Full-Disclosure - We believe in it. Charter: http://lists.netsys.com/full-disclosure-charter.html
Current thread:
- ICMP Covert channels question cyberpixl (Jan 28)
- Re: ICMP Covert channels question Andrew Farmer (Jan 28)
- Re: ICMP Covert channels question Paul Schmehl (Jan 28)
- RE: ICMP Covert channels question lists-security (Jan 29)
- RE: ICMP Covert channels question Paul Schmehl (Jan 29)
- RE: ICMP Covert channels question lists-security (Jan 29)
- RE: ICMP Covert channels question lists-security (Jan 29)
- Re: ICMP Covert channels question cyberpixl (Jan 30)
- Re: ICMP Covert channels question Gadi Evron (Jan 28)
- <Possible follow-ups>
- Re: ICMP Covert channels question Darren Bounds (Jan 29)