Command Execution

$ env

HTTP_USER_AGENT=CCBot/2.0 (https://commoncrawl.org/faq/)
HTTP_HOST=command-executor.hackme.inndy.tw
HTTP_X_REAL_IP=34.204.183.113
USER=www-data
HTTP_CONNECTION=close
_=/usr/bin/env
PWD=/var/www/html
HTTP_IF_MODIFIED_SINCE=Thu, 12 Dec 2019 09:37:30 UTC
HTTP_ACCEPT_LANGUAGE=en-US,en;q=0.5
HTTP_ACCEPT=text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
HOME=/var/www
SHLVL=2
HTTP_ACCEPT_ENCODING=br,gzip
HTTP_X_FORWARDED_PROTO=https