C-0148 - Ensure that the Controller Manager --root-ca-file argument is set as appropriate
Framework
cis-v1.23-t1.0.1
Severity
High
Description of the the issue
Processes running within pods that need to contact the API server must verify the API server's serving certificate. Failing to do so could be a subject to man-in-the-middle attacks.
Providing the root certificate for the API server's serving certificate to the controller manager with the --root-ca-file
argument allows the controller manager to inject the trusted bundle into pods so that they can verify TLS connections to the API server.
Related resources
Pod
What does this control test
Allow pods to verify the API server's serving certificate before establishing connections.
How to check it manually
Run the following command on the Control Plane node:
ps -ef | grep kube-controller-manager
Verify that the --root-ca-file
argument exists and is set to a certificate bundle file containing the root certificate for the API server's serving certificate.
Remediation
Edit the Controller Manager pod specification file /etc/kubernetes/manifests/kube-controller-manager.yaml
on the Control Plane node and set the --root-ca-file
parameter to the certificate bundle file`.
--root-ca-file=<path/to/file>
Impact Statement
You need to setup and maintain root certificate authority file.
Default Value
By default, --root-ca-file
is not set.
Example
No example
Updated 9 days ago