--kubelet-https argument is set to true
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--kubelet-https argument is set to true

kubernetes

Classification:

compliance

Framework:

cis-kubernetes

Control:

1.2.4

Set up the kubernetes integration.

Overview

Description

Use https for kubelet connections.

Rationale

Connections from apiserver to kubelets could potentially carry sensitive data such as secrets and keys. It is thus important to use in-transit encryption for any communication between the apiserver and kubelets.

Audit

Run the following command on the master node:

ps -ef | grep kube-apiserver

Verify that the --kubelet-https argument either does not exist or is set to true.

Remediation

Edit the API server pod specification file /etc/kubernetes/manifests/kube-apiserver.yaml on the master node and remove the --kubelet-https parameter.

Impact

You require TLS to be configured on apiserver as well as kubelets.

Default Value

By default, kubelet connections are over https.

References

  1. https://kubernetes.io/docs/admin/kube-apiserver/
  2. https://kubernetes.io/docs/admin/kubelet-authentication-authorization/

CIS Controls

Version 6 14.2 Encrypt All Sensitive Information Over Less-trusted Networks All communication of sensitive information over less-trusted networks should be encrypted. Whenever information flows over a network with a lower trust level, the information should be encrypted.

Version 7 14.4 Encrypt All Sensitive Information in Transit Encrypt all sensitive information in transit.