ESXI-06-000015 - The SSH daemon must not allow authentication using an empty password.

Information

Configuring this setting for the SSH daemon provides additional assurance that remote login via SSH will require a password, even in the event of misconfiguration elsewhere.

Solution

To explicitly disallow remote login from accounts with empty passwords, add or correct the following line in '/etc/ssh/sshd_config':

PermitEmptyPasswords no

See Also

https://dl.dod.cyber.mil/wp-content/uploads/stigs/zip/U_VMware_vSphere_6-0_ESXi_V1R5_STIG.zip