I've been doing some research on creating covert channels using icmp packets and a bounce server and so far everything worked fine. I can contact my web server through a bounce server outside of my network (like www.google.com or whatever). In my current setup both client and target are located in the same network and comunicate through the bounce server using icmp packets.
Now, would it be possible to access a server behind a firewall, that normally isn't accessable, using this technique, if i'm outside of the target network? 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? _______________________________________________ Full-Disclosure - We believe in it. Charter: http://lists.netsys.com/full-disclosure-charter.html
