cis-ocp-v190-5.7.4

DevOps & Security

The default namespace should not be used (Manual)

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CIS Red Hat OpenShift Container Platform Benchmark v1.9.0 - 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.

For more information, see Working with projects and Configuring project creation.

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)'

There are 15 separate resource categories returned in the json dump from oc get all; they all should be empty unless related to a system resource.

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

None specified.

CIS Controls

Controls Version	Control	IG 1	IG 2	IG 3
v8	4.9 Configure Trusted DNS Servers on Enterprise Assets		x	x
v7	5 Secure Configuration for Hardware and Software on Mobile Devices, Laptops, Workstations and Servers

MITRE ATT&CK Mappings

Techniques / Sub-techniques	Tactics	Mitigations
T1578	TA0005	M1018

Profile

Level 2 (Manual)