Kubernetes Controller Manager must have the SSL Certificate Authority set.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-242421	CNTR-K8-001430	SV-242421r717033_rule		Medium

Description
The Kubernetes Controller Manager is responsible for creating service accounts and tokens for the API Server, maintaining the correct number of pods for every replication controller and provides notifications when nodes are offline. Anyone who gains access to the Controller Manager can generate backdoor accounts, take possession of, or diminish system performance without detection by disabling system notification. Using authenticity protection, the communication can be protected against man-in-the-middle attacks/session hijacking and the insertion of false information into sessions. The communication session is protected by utilizing transport encryption protocols, such as TLS. TLS provides the Kubernetes Controller Manager with a means to be able to authenticate sessions and encrypt traffic.

Description

The Kubernetes Controller Manager is responsible for creating service accounts and tokens for the API Server, maintaining the correct number of pods for every replication controller and provides notifications when nodes are offline. Anyone who gains access to the Controller Manager can generate backdoor accounts, take possession of, or diminish system performance without detection by disabling system notification. Using authenticity protection, the communication can be protected against man-in-the-middle attacks/session hijacking and the insertion of false information into sessions. The communication session is protected by utilizing transport encryption protocols, such as TLS. TLS provides the Kubernetes Controller Manager with a means to be able to authenticate sessions and encrypt traffic.

STIG	Date
Kubernetes Security Technical Implementation Guide	2021-11-22

Details

Check Text ( C-45696r712617_chk )
Change to the /etc/kubernetes/manifests/ directory on the Kubernetes Master Node. Run the command: grep -i root-ca-file * If the setting client-ca-file is not set in the Kubernetes Controller Manager manifest file or contains no value, this is a finding.

Fix Text (F-45654r712618_fix)
Edit the Kubernetes Controller Manager manifest file in the /etc/kubernetes/manifests directory on the Kubernetes Master Node. Set the value of root-ca-file to path containing Approved Organizational Certificate.