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1.274 OL09-00-002349

Information

OL 9 SSH daemon must not allow known hosts authentication.

GROUP ID: V-271712
RULE ID: SV-271712r1091848

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/27024

Item Details

Category: CONFIGURATION MANAGEMENT

References: 800-53|CM-6b., CCI|CCI-000366, Rule-ID|SV-271712r1091848_rule, STIG-ID|OL09-00-002349, Vuln-ID|V-271712

Plugin: Unix

Control ID: 2cf39e5493192159b05d3bf9e30e6b4ee78d6cbec45739133e60af48bfe0a5a3