cis-ocp-v170-1-2-15

name	cis-ocp-v170-1.2.15
description	Ensure that the admission control plugin NodeRestriction is set (Manual)
category	cis-openshift
version	1.7.0
author	cyberstrike-official
tags	["cis","openshift","kubernetes","redhat","control-plane","api-server"]
cis_id	1.2.15
cis_benchmark	CIS Red Hat OpenShift Container Platform Benchmark v1.7.0
tech_stack	["kubernetes","openshift","redhat"]
cwe_ids	[]
chains_with	[]
prerequisites	[]
severity_boost	{}

CIS Red Hat OpenShift Container Platform Benchmark v1.7.0 - Control 1.2.15

Profile Applicability

• Level: 1

Description

Limit the Node and Pod objects that a kubelet could modify.

Rationale

Using the NodeRestriction plug-in ensures that the kubelet is restricted to the Node and Pod objects that it could modify as defined. Such kubelets will only be allowed to modify their own Node API object, and only modify Pod API objects that are bound to their node.

Impact

None.

Audit Procedure

In OpenShift, the NodeRestriction admission plugin is enabled by default.

Use the following command to obtain a list of configured admission controllers:

oc -n openshift-kube-apiserver get configmap config -o json | jq -r '.data."config.yaml"' | jq '.apiServerArguments."enable-admission-plugins"'

Verify the list includes NodeRestriction.

Remediation

None.

Default Value

In OpenShift, the NodeRestriction admission plugin is enabled by default and cannot be disabled.

References

1. https://docs.openshift.com/container-platform/latest/architecture/admission-plug-ins.html
2. https://github.com/openshift/origin/blob/release-4.5/vendor/k8s.io/kubernetes/cmd/kubeadm/app/phases/controlplane/manifests.go#L132

CIS Controls

Controls Version	Control	IG 1	IG 2	IG 3
v8	16.11 Leverage Vetted Modules or Services for Application Security Components		*	*
v7	9.4 Apply Host-based Firewalls or Port Filtering	*	*	*

MITRE ATT&CK Mappings