Description
This module uses a malformed packet or timing attack to enumerate users on an OpenSSH server.
The default action sends a malformed (corrupted) SSH_MSG_USERAUTH_REQUEST packet using public key authentication (must be enabled) to enumerate users.
On some versions of OpenSSH under some configurations, OpenSSH will return a "permission denied" error for an invalid user faster than for a valid user, creating an opportunity for a timing attack to enumerate users.
Testing note: invalid users were logged, while valid users were not. YMMV.
Module options
To display the available options, load the module within the Metasploit console and run the commands 'show options' or 'show advanced':
msf > use auxiliary/scanner/ssh/ssh/enumusersmsf undefined(enumusers) > show actions ...actions...msf undefined(enumusers) > set ACTION < action-name >msf undefined(enumusers) > show options ...show and set options...msf undefined(enumusers) > runPrioritise with Active Threat Intelligence
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