Cis Eks V160 4.5.2

4.5.2 The default namespace should not be used (Automated)

Profile Applicability

• Level 1

Description

Kubernetes provides a default namespace, where objects are placed if no namespace is specified for them. Placing objects in this namespace makes application of RBAC and other controls more difficult.

Rationale

Resources in a Kubernetes cluster should be segregated by namespace, to allow for security controls to be applied at that level and to make it easier to manage resources.

Impact

None.

Audit Procedure

Run the below command to list objects in the default namespace:

kubectl get all -n default

The only entries there should be system-managed resources such as the kubernetes service.

# Check for user-created resources in default namespace
kubectl get pods -n default
kubectl get deployments -n default
kubectl get services -n default | grep -v kubernetes
kubectl get configmaps -n default | grep -v kube-root-ca

Remediation

Ensure that namespaces are created to allow for appropriate segregation of Kubernetes resources and that all new resources are created in a specific namespace.

Default Value

Unless a namespace is specified, all Kubernetes resources are created in the default namespace.

References

1. https://kubernetes.io/docs/concepts/overview/working-with-objects/namespaces/

CIS Controls