cis-ocp-v180-4.1.1
DevOps & SecurityEnsure that the kubelet service file permissions are set to 644 or more restrictive (Automated)
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CIS Red Hat OpenShift Container Platform Benchmark v1.8.0 - Control 4.1.1
Profile Applicability
- Level: 1
Description
Ensure that the kubelet service file has permissions of 644 or more restrictive.
Rationale
The kubelet service file controls various parameters that set the behavior of the kubelet service in the worker node. You should restrict its 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
Kubelet is run as a systemd unit and its configuration file is created with 644 permissions.
Run the following command:
for node in $(oc get nodes -o jsonpath='{.items[*].metadata.name}')
do
oc debug node/${node} -- chroot /host stat -c %a
/etc/systemd/system/kubelet.service
done
OR
for node in $(oc get nodes -o jsonpath='{.items[*].metadata.name}')
do
oc debug node/${node} -- chroot /host stat -c %a
/host/usr/lib/systemd/system/kubelet.service
done
Verify that the permissions are 644 or more restrictive.
Remediation
None.
Default Value
By default, the kubelet service file has permissions of 644.
References
- https://docs.openshift.com/container-platform/4.5/architecture/control-plane.html#understanding-machine-config-operator_control-plane
- https://docs.openshift.com/container-platform/4.5/scalability_and_performance/recommended-host-practices.html#create-a-kubeletconfig-crd-to-edit-kubelet-parameters_
- https://kubernetes.io/docs/reference/command-line-tools-reference/kubelet/
- https://kubernetes.io/docs/setup/production-environment/tools/kubeadm/create-cluster-kubeadm/#44-joining-your-nodes
- https://kubernetes.io/docs/reference/setup-tools/kubeadm/#kubelet-drop-in
CIS Controls
| Controls Version | Control | IG 1 | IG 2 | IG 3 |
|---|---|---|---|---|
| v8 | 3.3 Configure Data Access Control Lists | * | * | * |
| v7 | 14.6 Protect Information through Access Control Lists | * | * | * |
MITRE ATT&CK Mappings
| Techniques / Sub-techniques | Tactics | Mitigations |
|---|---|---|
| T1083, T1222 | TA0005, TA0007 | M1022 |
Profile
Level 1 (Automated)