cis-k8s-v1110-1-2-12

name	cis-k8s-v1110-1.2.12
description	Ensure that the admission control plugin ServiceAccount is set (Automated)
category	cis-k8s
version	1.11.0
author	cyberstrike-official
tags	["cis","kubernetes","control-plane","api-server","admission-plugins","service-account","authentication"]
cis_id	1.2.12
cis_benchmark	CIS Kubernetes Benchmark v1.11.0
tech_stack	["kubernetes"]
cwe_ids	[]
chains_with	[]
prerequisites	[]
severity_boost	{}

1.2.12 Ensure that the admission control plugin ServiceAccount is set (Automated)

Profile Applicability

• Level 2 - Master Node

Description

Automate service accounts management.

Rationale

When you create a pod, if you do not specify a service account, it is automatically assigned the default service account in the same namespace. You should create your own service account and let the API server manage its security tokens.

Impact

None.

Audit

Run the following command on the Control Plane node:

ps -ef | grep kube-apiserver

Verify that the --disable-admission-plugins argument is set to a value that does not includes ServiceAccount.

Remediation

Follow the documentation and create ServiceAccount objects as per your environment. Then, edit the API server pod specification file /etc/kubernetes/manifests/kube-apiserver.yaml on the master node and ensure that the --disable-admission-plugins parameter is set to a value that does not include ServiceAccount.

Default Value

By default, ServiceAccount is set.

References

1. https://kubernetes.io/docs/reference/command-line-tools-reference/kube-apiserver/
2. https://kubernetes.io/docs/reference/access-authn-authz/admission-controllers/#serviceaccount
3. https://kubernetes.io/docs/tasks/configure-pod-container/configure-service-account/

CIS Controls

Controls Version	Control	IG 1	IG 2	IG 3
v8	3.3 Configure Data Access Control Lists	*	*	*
v7	14.6 Protect Information through Access Control Lists	*	*	*