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The Kubernetes API server must have the secure port set.


Finding ID Version Rule ID IA Controls Severity
V-242389 CNTR-K8-000350 SV-242389r863965_rule Medium
By default, the API server will listen on what is rightfully called the secure port, port 6443. Any requests to this port will perform authentication and authorization checks. If this port is disabled, anyone who gains access to the host on which the Control Plane is running has full control of the entire cluster over encrypted traffic. Open the secure port by setting the API server's --secure-port flag to a value other than "0".
Kubernetes Security Technical Implementation Guide 2022-12-02


Check Text ( C-45664r863770_chk )
Change to the /etc/kubernetes/manifests directory on the Kubernetes Control Plane. Run the command:

grep -i secure-port *

If the setting secure-port is set to "0" or is not configured in the Kubernetes API manifest file, this is a finding.
Fix Text (F-45622r863771_fix)
Edit the Kubernetes API Server manifest file in the /etc/kubernetes/manifests directory on the Kubernetes Control Plane. Set the argument --secure-port to a value greater than "0".