V-242410

Discussion

Kubernetes API Server PPSs must be controlled and conform to the PPSM CAL. Those PPS that fall outside the PPSM CAL must be blocked. Instructions on the PPSM can be found in DoD Instruction 8551.01 Policy.

Check Content

Change to the /etc/kubernetes/manifests/ directory on the Kubernetes Control Plane. Run the command:
grep kube-apiserver.manifest -I -secure-port *
grep kube-apiserver.manifest -I -etcd-servers *
-edit manifest file:
VIM <Manifest Name>
Review livenessProbe:
HttpGet:
Port:
Review ports:
- containerPort:
hostPort:
- containerPort:
hostPort:

Run command: 
kubectl describe services --all-namespaces 
Search labels for any apiserver namespaces.
Port:

Any manifest and namespace PPS or services configuration not in compliance with PPSM CAL is a finding.

Review the information systems documentation and interview the team, gain an understanding of the API Server architecture, and determine applicable PPS. If there are any PPS in the system documentation not in compliance with the CAL PPSM, this is a finding. Any PPS not set in the system documentation is a finding.

Review findings against the most recent PPSM CAL:
https://cyber.mil/ppsm/cal/

Verify API Server network boundary with the PPS associated with the CAL Assurance Categories. Any PPS not in compliance with the CAL Assurance Category requirements is a finding.