The Kubernetes API server must have the secure port set.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-242389	CNTR-K8-000350	SV-242389r712523_rule		Medium

Description
By default, the API server will listen on what is rightfully called the secure port, port 6443. Any requests to this port will perform authentication and authorization checks. If this port is disabled, anyone who gains access to the host on which the master is running has full control of the entire cluster over encrypted traffic. Open the secure port by setting the API server's --secure-port flag to a value other than "0".

Description

By default, the API server will listen on what is rightfully called the secure port, port 6443. Any requests to this port will perform authentication and authorization checks. If this port is disabled, anyone who gains access to the host on which the master is running has full control of the entire cluster over encrypted traffic. Open the secure port by setting the API server's --secure-port flag to a value other than "0".

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

Details

Check Text ( C-45664r712521_chk )
Change to the /etc/kubernetes/manifests directory on the Kubernetes Master Node. Run the command: grep -i secure-port * If the setting secure-port is set to "0" or is not configured in the Kubernetes API manifest file, this is a finding.

Fix Text (F-45622r712522_fix)
Edit the Kubernetes API Server manifest file in the /etc/kubernetes/manifests directory on the Kubernetes Master Node. Set the argument --secure-port to a value greater than "0".