The Kubernetes Controller Manager must create unique service accounts for each work payload.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-242381	CNTR-K8-000220	SV-242381r960768_rule		High

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
Kubernetes Security Technical Implementation Guide	2024-08-22

Details

Check Text (C-45656r927075_chk)

Change to the /etc/kubernetes/manifests directory on the Kubernetes Control Plane. Run the command:

grep -i use-service-account-credentials *

If the setting "--use-service-account-credentials" is not configured in the Kubernetes Controller Manager manifest file or it is set to "false", this is a finding.

Fix Text (F-45614r927076_fix)

Edit the Kubernetes Controller Manager manifest file in the /etc/kubernetes/manifests directory on the Kubernetes Control Plane.

Set the value of "--use-service-account-credentials" to "true".