| name | cis-oke-v150-3.2.4 |
| description | Ensure that the --read-only-port argument is set to 0 (Automated) |
| category | cis-oke |
| version | 1.5.0 |
| author | cyberstrike-official |
| tags | ["cis","oke","kubernetes","oci","worker-node","kubelet"] |
| cis_id | 3.2.4 |
| cis_benchmark | CIS Oracle Cloud Infrastructure Container Engine for Kubernetes (OKE) Benchmark v1.5.0 |
| tech_stack | ["kubernetes","oci","oke"] |
| cwe_ids | [] |
| chains_with | [] |
| prerequisites | [] |
| severity_boost | {} |
3.2.4 Ensure that the --read-only-port argument is set to 0 (Automated)
Profile Applicability
Description
Disable the read-only port.
Rationale
The Kubelet process provides a read-only API in addition to the main Kubelet API. Unauthenticated access is provided to this read-only API which could possibly retrieve potentially sensitive information about the cluster.
Impact
Removal of the read-only port will require that any service which made use of it will need to be re-configured to use the main Kubelet API.
Audit Procedure
If using a Kubelet configuration file, check that there is an entry for --read-only-port=0.
First, SSH to the relevant node:
Run the following command on each node to find the appropriate Kubelet service config file:
find / -name kubelet.service
The output of the above command should return the file and location /etc/systemd/system/kublet.service which is the location of the Kubelet service config file.
Open the Kubelet service config file:
sudo more etc/systemd/system/kublet.service
Verify that the --read-only-port argument exists and is set to 0.
If the --read-only-port argument is not present, check that there is a Kubelet config file specified by --config. Check that if there is a readOnlyPort entry in the file, it is set to 0.
Remediation
If modifying the Kubelet config file, edit the kubelet.service file /etc/sytemd/system/kubelet.service and set the below parameter
--read-only-port=0
For all remediations:
Based on your system, restart the kubelet service and check status
systemctl daemon-reload
systemctl restart kubelet.service
systemctl status kubelet -l
Default Value
See the OKE documentation for the default value.
References
- https://kubernetes.io/docs/admin/kubelet/
CIS Controls
| Controls Version | Control | IG 1 | IG 2 | IG 3 |
|---|
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