V-242394—Kubernetes Worker Nodes must not have the sshd service enabled.

CAT II - Medium

CNTR-K8-000410

>Control Description

Worker Nodes are maintained and monitored by the Control Plane. Direct access and manipulation of the nodes must not take place by administrators. Worker nodes must be treated as immutable and updated via replacement rather than in-place upgrades.

>Check Content

$systemctl is-enabled sshd.service

If the service sshd is enabled, this is a finding. Note: If console access is not available, SSH access can be attempted. If the worker nodes cannot be reached, this requirement is "not a finding".

>Remediation

To disable the sshd service,

$chkconfig sshd off Note:

If access to the worker node is through an SSH session, it is important to realize there are two requirements for disabling and stopping the sshd service that must be done during the same SSH session. Disabling the service must be performed first and then the service stopped to guarantee both settings can be made if the session is interrupted.

>CCI References

CCI-000213

Control Correlation Identifiers (CCIs) map STIG findings to NIST 800-53 controls.

>Cross-Framework Mappings

NIST SP 800-53 r5

via DISA CCI List

AC-3

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