cis-k8s-v1120-4.2.2

DevOps & Security

Ensure that the --authorization-mode argument is not set to AlwaysAllow (Automated)

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CIS Kubernetes Benchmark v1.12.0 - Control 4.2.2

Description

Do not allow all requests. Enable explicit authorization.

Rationale

Kubelets, by default, allow all authenticated requests (even anonymous ones) without needing explicit authorization checks from the apiserver. You should restrict this behavior and only allow explicitly authorized requests.

Impact

Unauthorized requests will be denied.

Audit Procedure

Step 1: Verify via process arguments

Run the following command on each node:

ps -ef | grep kubelet

If the --authorization-mode argument is present check that it is not set to AlwaysAllow. If it is not present check that there is a Kubelet config file specified by --config, and that file sets authorization: mode to something other than AlwaysAllow.

It is also possible to review the running configuration of a Kubelet via the /configz endpoint on the Kubelet API port (typically 10250/TCP). Accessing these with appropriate credentials will provide details of the Kubelet's configuration.

Remediation

If using a Kubelet config file, edit the file to set authorization: mode to Webhook.

If using executable arguments, edit the kubelet service file /etc/kubernetes/kubelet.conf on each worker node and set the below parameter in KUBELET_AUTHZ_ARGS variable.

--authorization-mode=Webhook

Based on your system, restart the kubelet service. For example:

systemctl daemon-reload
systemctl restart kubelet.service

Default Value

By default, --authorization-mode argument is set to AlwaysAllow.

References

CIS Controls

Controls Version	Control	IG 1	IG 2	IG 3
v8	3.3 Configure Data Access Control ListsConfigure data access control lists based on a user's need to know. Apply data access control lists, also known as access permissions, to local and remote file systems, databases, and applications.	●	●	●
v7	9.2 Ensure Only Approved Ports, Protocols and Services Are RunningEnsure that only network ports, protocols, and services listening on a system with validated business needs, are running on each system.		●	●

Profile Applicability

Level 1 - Worker Node

Assessment Status

Automated