cis-ocp-v160-1-2-12

name	cis-ocp-v160-1.2.12
description	Ensure that the admission control plugin ServiceAccount is set (Manual)
category	cis-openshift
version	1.6.0
author	cyberstrike-official
tags	["cis","openshift","kubernetes","redhat","control-plane","api-server","service-account"]
cis_id	1.2.12
cis_benchmark	CIS Red Hat OpenShift Container Platform Benchmark v1.6.0
tech_stack	["kubernetes","openshift","redhat"]
cwe_ids	[]
chains_with	[]
prerequisites	[]
severity_boost	{}

CIS Red Hat OpenShift Container Platform Benchmark v1.6.0 - Control 1.2.12

Profile Applicability

• Level: 1

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 Procedure

The ServiceAccount admission control plugin is enabled by default. Every service account has an associated user name that can be granted roles, just like a regular user. The user name for each service account is derived from its project and the name of the service account. Service accounts are required in each project to run builds, deployments, and other pods. The default service accounts that are automatically created for each project are isolated by the project namespace.

Use the following command to obtain a list of configured admission controllers:

oc -n openshift-kube-apiserver get configmap config -o json | jq -r '.data."config.yaml"' | jq '.apiServerArguments."enable-admission-plugins"'

Verify the list includes ServiceAccount.

Remediation

None.

Default Value

By default, OpenShift configures the ServiceAccount admission controller.

References

1. https://docs.openshift.com/container-platform/latest/authentication/understanding-and-creating-service-accounts.html
2. https://docs.openshift.com/container-platform/latest/architecture/admission-plug-ins.html
3. https://github.com/openshift/cluster-kube-apiserver-operator/blob/release-4.6/bindata/v4.1.0/config/defaultconfig.yaml#L34-L78
4. https://kubernetes.io/docs/reference/command-line-tools-reference/kube-apiserver/
5. https://kubernetes.io/docs/reference/access-authn-authz/admission-controllers/#serviceaccount