cis-oke-v150-5-4-3

name	cis-oke-v150-5.4.3
description	Ensure clusters are created with Private Nodes (Automated)
category	cis-oke
version	1.5.0
author	cyberstrike-official
tags	["cis","oke","kubernetes","oci","managed-services","cluster-networking","network-policy"]
cis_id	5.4.3
cis_benchmark	CIS Oracle Cloud Infrastructure Container Engine for Kubernetes (OKE) Benchmark v1.5.0
tech_stack	["kubernetes","oci","oke"]
cwe_ids	[]
chains_with	[]
prerequisites	[]
severity_boost	{}

5.4.3 Ensure clusters are created with Private Nodes (Automated)

Profile Applicability

• Level 1

Description

Disable public IP addresses for cluster nodes, so that they only have private IP addresses. Private Nodes are nodes with no public IP addresses.

Rationale

Disabling public IP addresses on cluster nodes restricts access to only internal networks, forcing attackers to obtain local network access before attempting to compromise the underlying Kubernetes hosts.

Impact

To enable Private Nodes, the cluster has to also be configured with a private master IP range and IP Aliasing enabled.

Private Nodes do not have outbound access to the public internet. If you want to provide outbound Internet access for your private nodes, you can use Cloud NAT or you can manage your own NAT gateway.

Audit

Check for the following:

export OKE_NODEPOOLID=<node pool id>
export OKE_NODEID=<node id>

oci ce node-pool get --node-pool-id ${OKE_NODEPOOLID=} --node-id \
  ${OKE_NODEID=} [--query <query>] [--auth <auth-token>] [--profile <profile-name>] [--region <region>]

Remediation

Configure nodes to use private IP addresses only. Disable public IP assignment for node pools.

Default Value

By default, Private Nodes are disabled.

References

1. https://docs.cloud.oracle.com/en-us/iaas/Content/ContEng/Concepts/contengclustersnodes.htm

CIS Controls

Controls Version	Control	IG 1	IG 2	IG 3
v8	4.1 Establish and Maintain a Secure Configuration Process - Establish and maintain a secure configuration process for enterprise assets (end-user devices, including portable and mobile, non-computing/IoT devices, and servers) and software (operating systems and applications). Review and update documentation annually, or when significant enterprise changes occur that could impact this Safeguard.	x	x	x
v7	5.1 Establish Secure Configurations - Maintain documented, standard security configuration standards for all authorized operating systems and software.