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1.164 ALMA-09-021140

Information

AlmaLinux OS 9 SSH daemon must not allow known hosts authentication.

GROUP ID: V-269267
RULE ID: SV-269267r1050149

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

See Also

https://workbench.cisecurity.org/benchmarks/27039

Item Details

Category: CONFIGURATION MANAGEMENT

References: 800-53|CM-6b., CCI|CCI-000366, Rule-ID|SV-269267r1050149_rule, STIG-ID|ALMA-09-021140, Vuln-ID|V-269267

Plugin: Unix

Control ID: 3f6b4e83d5de19480b604d543db5f17ce1a2cd4119c285fb3e0522575d8ac764