This exploits a command execution in Pi-Hole Web Interface <= 5.5. The Settings > API/Web inetrace page contains the field Top Domains/Top Advertisers which is validated by a regex which does not properly filter system commands, which can then be executed by calling the gravity functionality. However, the regex only allows a-z, 0-9, _.
PHP
php
To display the available options, load the module within the Metasploit console and run the commands 'show options' or 'show advanced':
msf > use auxiliary/admin/http/pihole_domains_api_exec
msf auxiliary(pihole_domains_api_exec) > show actions
...actions...
msf auxiliary(pihole_domains_api_exec) > set ACTION < action-name >
msf auxiliary(pihole_domains_api_exec) > show options
...show and set options...
msf auxiliary(pihole_domains_api_exec) > run
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