Kubernetes STIG Version Comparison

There are 3 differences between versions v1 r11 (Oct. 25, 2023) (the "left" version) and v2 r2 (Oct. 24, 2024) (the "right" version).

Check CNTR-K8-000920 was changed between these two versions. Green, underlined text was added, red, struck-out text was removed.

The regular view of the left check and right check may be easier to read.

Title

The Kubernetes API Server must enforce ports, protocols, and services (PPS) that adhere to the Ports, Protocols, and Services Management Category Assurance List (PPSM CAL).

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 command: kubectl describe services –all-namespace Search --all-namespaces Search labels for any apiserver names spaces. Port: Any 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 ports, protocols, and services 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.

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.

Fix

Amend any system documentation requiring revision. revision Update to comply with PPSM CAL. Update Kubernetes API Server manifest and namespace PPS configuration to comply with PPSM CAL.