4ba7dfde5b79ec835e8739922400b3f5f4f089f2
A null password allows logging into local PAM services such as "login" (agetty) and KDM. That's not actually a security problem for EC2 machines, since they do not have "local" logins; for VirtualBox machines, if you local access, you can do anything anyway. But it's better to be on the safe side and disable password-based logins for root.
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