Tmux ¶

Tmux is a terminal multiplexer. It is used to split a single terminal in multiple terminal sessions. For instance, if we are connected to a machine via SSH, instead of opening two terminals and connecting to SSH each, we could use tmux to split the current terminal in two.

Each time we use tmux, it creates a socket. We can connect back to this socket to reconnect to the tmux session.

By default, sessions are stored in /tmp. Users can define a custom socket. If the permissions are incorrectly set on it (if they were edited), we may be able to exploit them.

$ sudo tmux -S /my/socket new -s session_name
$ sudo chown root:xxx /my/socket # misconfiguration ⚠️
$ tmux -S /my/socket             # if we are in 'xxx' => root

• Guake/iTerm2/Terminology/tmux/terminator/tmux + cheatsheet