Kubernetes Clusters Should Not Use the Default Namespace

Description:

Prevent usage of the default namespace in Kubernetes clusters to protect against unauthorized access for ConfigMap, Pod, Secret, Service, and ServiceAccount resource types.

Remediation/Reference:

Security Center lists the components using the default namespace.
1. From the unhealthy resources tab, select a cluster.
2. Define a namespace for the components.
3. After making your changes, redeploy the components with the updated namespace. For more information, see https://kubernetes.io/docs/tasks/administer-cluster/namespaces/#creating-a-new-namespace