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V-254554

CAT II (Medium)

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

Rule ID

SV-254554r1043176_rule

STIG

Rancher Government Solutions RKE2 Security Technical Implementation Guide

Version

V2R6

CCIs

CCI-000015

Discussion

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.

Check Content

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

Edit the RKE2 Configuration File /etc/rancher/rke2/config.yaml on the RKE2 Control Plane and set the following "kube-controller-manager-arg" argument:
- use-service-account-credentials=true

Once the configuration file is updated, restart the RKE2 Server. Run the command:
systemctl restart rke2-server