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

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-242412	CNTR-K8-000940	SV-242412r712592_rule		Medium

Description
Kubernetes Controller ports, protocols, and services 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.

STIG	Date
Kubernetes Security Technical Implementation Guide	2021-04-14

Details

Check Text ( C-45687r712590_chk )
Change to the /etc/kubernetes/manifests/ directory on the Kubernetes Master Node. Run the command: grep kube-scheduler.manifest -I -insecure-port grep kube-scheduler.manifest -I -secure-port -edit manifest file: VIM Review livenessProbe: HttpGet: Port: Review ports: - containerPort: hostPort: - containerPort: hostPort: Run Command: kubectl describe services –all-namespace Search labels for any controller names spaces. 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 Controller architecture, and determine applicable PPS. Any PPS in the system documentation not in compliance with the CAL PPSM 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 Controller network boundary with the PPS associated with the Controller for Assurance Categories. Any PPS not in compliance with the CAL Assurance Category requirements is a finding.

Check Text ( C-45687r712590_chk )

Change to the /etc/kubernetes/manifests/ directory on the Kubernetes Master Node. Run the command:
grep kube-scheduler.manifest -I -insecure-port
grep kube-scheduler.manifest -I -secure-port
-edit manifest file:
VIM Review livenessProbe:
HttpGet:
Port:
Review ports:
- containerPort:
hostPort:
- containerPort:
hostPort:
Run Command:
kubectl describe services –all-namespace
Search labels for any controller names spaces.
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 Controller architecture, and determine applicable PPS. Any PPS in the system documentation not in compliance with the CAL PPSM 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 Controller network boundary with the PPS associated with the Controller for Assurance Categories. Any PPS not in compliance with the CAL Assurance Category requirements is a finding.

Fix Text (F-45645r712591_fix)
Amend any system documentation requiring revision. Update Kubernetes Controller manifest and namespace PPS configuration to comply with PPSM CAL.