Cis Ocp V190 1.1.17

CIS Red Hat OpenShift Container Platform Benchmark v1.9.0 - Control 1.1.17

Profile Applicability

• Level: 1

Description

Ensure that the kubeconfig file mounted into the Controller Manager has permissions of 600 or more restrictive.

Rationale

You should restrict the kubeconfig file permissions to maintain the integrity of the file. The file should be writable by only the administrators on the system.

Impact

None.

Audit Procedure

The kubeconfig file for kube-controller-manager is stored in the ConfigMap controller-manager-kubeconfig in the namespace openshift-kube-controller-manager. The kubeconfig file is referenced in the pod via hostpath and is stored in /etc/kubernetes/static-pod-resources/configmaps/controller-manager-kubeconfig/kubeconfig with permissions 600.

Run the following command.

for i in $(oc get pods -n openshift-kube-controller-manager -l app=kube-controller-manager -oname)
  do
  oc exec -n openshift-kube-controller-manager $i -- \
  stat -c %a /etc/kubernetes/static-pod-resources/configmaps/controller-manager-kubeconfig/kubeconfig
  done

Verify that the permissions are 600 or more restrictive.

Remediation

There is no remediation for updating the permissions of the kubeconfig file. The file is owned by an OpenShift operator and any changes to the file will result in a degraded cluster state.

Please do not attempt to remediate the permissions of this file.

Default Value

By default, in OpenShift 4.14, the kubeconfig has permissions of 600.

In older versions of OpenShift, the kubeconfig has permissions of 644, and is not remediable. Please upgrade to OpenShift 4.14 when possible.

References

1. https://docs.openshift.com/container-platform/4.5/operators/operator-reference.html#kube-controller-manager-operator_red-hat-operators
2. https://docs.openshift.com/container-platform/4.5/operators/operator-reference.html#cluster-openshift-controller-manager-operator_red-hat-operators
3. https://kubernetes.io/docs/reference/command-line-tools-reference/kube-controller-manager/
4. https://issues.redhat.com//browse/OCPBUGS-14323

CIS Controls

MITRE ATT&CK Mappings

Profile

Level 1 (Manual)