This module takes advantage of the addition of authorized ssh keys in the gitlab-shell functionality of Gitlab. Versions of gitlab-shell prior to 1.7.4 used the ssh key provided directly in a system call resulting in a command injection vulnerability. As this relies on adding an ssh key to an account, valid credentials are required to exploit this vulnerability.
Linux
To display the available options, load the module within the Metasploit console and run the commands 'show options' or 'show advanced':
msf > use exploit/multi/http/gitlab_shell_exec
msf exploit(gitlab_shell_exec) > show targets
...targets...
msf exploit(gitlab_shell_exec) > set TARGET < target-id >
msf exploit(gitlab_shell_exec) > show options
...show and set options...
msf exploit(gitlab_shell_exec) > exploit
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– Jim O’Gorman | President, Offensive Security