ALMA-09-021140 - AlmaLinux OS 9 SSH daemon must not allow known hosts authentication.

Information

Configuring the IgnoreUserKnownHosts 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

Configure the SSH daemon to not allow known hosts authentication.

Add the following line to "/etc/ssh/sshd_config", or uncomment the line and set the value to "yes":

IgnoreUserKnownHosts yes

Alternatively, add the setting to an include file if the line "Include /etc/ssh/sshd_config.d/*.conf" is found at the top of the "/etc/ssh/sshd_config" file:

$ echo 'IgnoreUserKnownHosts yes' > /etc/ssh/sshd_config.d/40-knownhosts.conf

Restart the SSH daemon for the settings to take effect:

$ systemctl restart sshd.service

Item Details

Audit Name: DISA Cloud Linux AlmaLinux OS 9 STIG v1r6

Category: CONFIGURATION MANAGEMENT

Plugin: Unix

Control ID: 1dd4392604fb0af3ef19b799fab247b798c3fe1743de331522e834ceafc8547e

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ALMA-09-021140 - AlmaLinux OS 9 SSH daemon must not allow known hosts authentication.

Information

Solution

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Item Details