cis-eks-v180-3.2.4
DevOps & SecurityEnsure that the --read-only-port is disabled (Automated)
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3.2.4 Ensure that the --read-only-port is disabled (Automated)
Profile Applicability
- Level 1
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.
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 authentication: anonymous: enabled set to 0.
First, SSH to the relevant node. Run the following command on each node to find the appropriate Kubelet config file:
ps -ef | grep kubelet
The output of the above command should return something similar to --config /etc/kubernetes/kubelet/kubelet-config.json which is the location of the Kubelet config file.
Open the Kubelet config file:
cat /etc/kubernetes/kubelet/kubelet-config.json
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-config.json file /etc/kubernetes/kubelet/kubelet-config.json and set the below parameter to 0:
"readOnlyPort": 0
If using executable arguments, edit the kubelet service file /etc/systemd/system/kubelet.service.d/10-kubelet-args.conf on each worker node and add the below parameter at the end of the KUBELET_ARGS variable string.
--read-only-port=0
For each remediation: 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 Amazon EKS documentation for the default value.
References
CIS Controls
| Controls Version | Control | IG 1 | IG 2 | IG 3 |
|---|---|---|---|---|
| v8 | 12.6 Use of Secure Network Management and Communication Protocols | X | X | |
| v7 | 9.2 Ensure Only Approved Ports, Protocols and Services Are Running | X | X |