CIS-2.2 - Ensure that the --client-cert-auth argument is set to true

Ensure that the --client-cert-auth argument is set to true

Framework

CIS

Severity

High

Description of the the issue

etcd is a highly-available key value store used by Kubernetes deployments for persistent storage of all of its REST API objects. These objects are sensitive in nature and should not be available to unauthenticated clients. You should enable the client authentication via valid certificates to secure the access to the etcd service.

Related resources

Pod

What does this control test

Enable client authentication on etcd service.

How to check it manually

Run the following command on the etcd server node:

ps -ef | grep etcd

Verify that the --client-cert-auth argument is set to true.

Remediation

Edit the etcd pod specification file /etc/kubernetes/manifests/etcd.yaml on the master node and set the below parameter.

--client-cert-auth="true"

Impact Statement

All clients attempting to access the etcd server will require a valid client certificate.

Default Value

By default, the etcd service can be queried by unauthenticated clients.

Example

No example