RKE2 must use a centralized user management solution to support account management functions.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-254554	CNTR-R2-000030	SV-254554r859232_rule		Medium

Description

The Kubernetes Controller Manager is a background process that embeds core control loops regulating cluster system state through the API Server. Every process executed in a pod has an associated service account. By default, service accounts use the same credentials for authentication. Implementing the default settings poses a high risk to the Kubernetes Controller Manager. Setting the use-service-account-credential value lowers the attack surface by generating unique service accounts settings for each controller instance.

STIG	Date
Rancher Government Solutions RKE2 Security Technical Implementation Guide	2022-10-13

Details

Check Text ( C-58038r859230_chk )
Ensure use-service-account-credentials argument is set correctly. Run this command on the RKE2 Control Plane: /bin/ps -ef | grep kube-controller-manager | grep -v grep If --use-service-account-credentials argument is not set to "true" or is not configured, this is a finding.

Fix Text (F-57987r859231_fix)
Edit the Controller Manager pod specification file /var/lib/rancher/rke2/agent/pod-manifests/kube-controller-manager.yaml on the RKE2 Control Plane to set the below parameter: --use-service-account-credentials argument=true Once configuration file is updated, restart the RKE2 Server. Run the command: systemctl restart rke2-server