Dangerous Settings

Despite the SSH protocol being one of the most secure protocols available today, some misconfigurations can still make the SSH server vulnerable to easy-to-execute attacks. Let us take a look at the following settings:

Setting	Description
PasswordAuthentication yes	Allows password-based authentication.
PermitEmptyPasswords yes	Allows the use of empty passwords.
PermitRootLogin yes	Allows to log in as the root user.
Protocol 1	Uses an outdated version of encryption.
X11Forwarding yes	Allows X11 forwarding for GUI applications.
AllowTcpForwarding yes	Allows forwarding of TCP ports.
PermitTunnel	Allows tunneling.
DebianBanner yes	Displays a specific banner when logging in.

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