Cis Ocp V170 5.7.4

CIS Red Hat OpenShift Container Platform Benchmark v1.7.0 - Control 5.7.4

Profile Applicability

• Level: 2

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

In OpenShift, projects (namespaces) are used to group and isolate related objects. When a request is made to create a new project using the web console or oc new-project command, an endpoint in OpenShift Container Platform is used to provision the project according to a template, which can be customized.

The cluster administrator can allow and configure how developers and service accounts can create, or self-provision, their own projects. Regular users do not have access to the default project.

Projects starting with openshift- and kube- host cluster components that run as Pods and other infrastructure components. As such, OpenShift does not allow you to create Projects starting with openshift- or kube- using the oc new-project command.

Run the following command to list all resources in the default namespace, besides the kubernetes and openshift services, which are expected to be in the default namespace:

oc get all -n default -o json | jq '.items[] | select((.kind|test("Service"))
and (.metadata.name|test("openshift|kubernetes"))? | not) | (.kind + "/" +
.metadata.name)'

Carefully review the list of returned resources and consider moving them to another namespace.

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 specific on object creation, the default namespace will be used.

References

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

CIS Controls

MITRE ATT&CK Mappings

Profile

Level 2 (Manual)