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1.232 RHEL-09-255150

Information

RHEL 9 SSH daemon must not allow known hosts authentication.

GROUP ID: V-258006
RULE ID: SV-258006r1045071

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 to a file in "/etc/ssh/sshd_config.d", or uncomment the line and set the value to "yes":

IgnoreUserKnownHosts yes

The SSH service must be restarted for changes to take effect:

$ sudo systemctl restart sshd.service

See Also

https://workbench.cisecurity.org/benchmarks/22008

Item Details

Category: CONFIGURATION MANAGEMENT

References: 800-53|CM-6b., CAT|II, CCI|CCI-000366, Rule-ID|SV-258006r1045071_rule, STIG-ID|RHEL-09-255150, Vuln-ID|V-258006

Plugin: Unix

Control ID: 1364fad3654aca3593dff8d3c313abf9b857e437ee369735127ea7a412a52e01