Though it’s outside of the scope of this article, common initiators for setting up the remote machine to access a shell include physical access to the machine, remotely exploiting the machine via a method that allows remote code execution, or setting up a “bad USB” drive that someone is tricked into plugging in to their machine, which would then run exploit commands. As “catch 22” as this sounds, there are several options to get netcat on the remote machine, as well as execute the netcat (nc) command to provide us a shell. Preparing for Remote Shell Accessīoth of these shell options require that commands be run on the remote host, so that we can run commands on the remote host. These remote shell access methods typically take one of two forms – a bind shell, or a reverse shell. In network security, netcat is typically used to transfer files to/from a compromised host, or to access a shell/command prompt on a compromised host. You can set up and tear down connections on any machine with netcat binaries, and that machine can act as either a server or a client to communicate with other machines running either another instance of netcat, or other services like SMTP. The simplest definition of netcat is that it’s a network utility that’s used to read to and write from TCP or UDP connections.
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