Shell upgrade

Grab some shell from this list

Note: I found out that zsh messes with the raw stty... Therefore do it with other shell than zsh, for instance: bash!

If you've made a reverse shell like

while true; do nc -lvvp 4747; done;

You probably got a shitty shell. You can try to upgrade it with Python:

With the shell opened, run (I'm assuming the system you owned has python):

python3 -c 'import pty; pty.spawn("/bin/bash")'

Note: not every server have bash installed, so the above command can throw an error. Try sh instead...

This way you'll have a nice shell already

1. At host, grab some info:

echo $TERM
xterm-256color

stty -a
speed 38400 baud; rows 17; columns 168; line = 0;

Now you know the terminal type and size.

2. Now, go to the victim shell and put it to the background with CTRL+Z

3. and run

stty raw -echo; fg

4. You will go back to the shell. Everything will look buggy. Type reset and press enter to get it back to the normal

reset

5. Then run

export TERM=xterm-256color
export SHELL=bash
stty rows 17 cols 168

et voilá!

Refs

• ropnop blog - Upgrading Simple Shells