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C 0147

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cis-v1.23-t1.0.1, cis-v1.10.0

Severity

Medium

Description of the the issue

To ensure that keys for service account tokens can be rotated as needed, a separate public/private key pair should be used for signing service account tokens. The private key should be specified to the controller manager with --service-account-private-key-file as appropriate.

Pod

What does this control test

Explicitly set a service account private key file for service accounts on the controller manager.

How to check it manually

Run the following command on the Control Plane node:

ps -ef | grep kube-controller-manager

Verify that the --service-account-private-key-file argument is set as appropriate.

Remediation

Edit the Controller Manager pod specification file /etc/kubernetes/manifests/kube-controller-manager.yaml on the Control Plane node and set the --service-account-private-key-file parameter to the private key file for service accounts.

--service-account-private-key-file=<filename>

Impact Statement

You would need to securely maintain the key file and rotate the keys based on your organization's key rotation policy.

Default Value

By default, --service-account-private-key-file it not set.

Example

No example