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The Kubernetes Kubelet certificate authority file must have file permissions set to 644 or more restrictive.


Finding ID Version Rule ID IA Controls Severity
V-242449 CNTR-K8-003160 SV-242449r864021_rule Medium
The Kubernetes kubelet certificate authority file contains settings for the Kubernetes Node TLS certificate authority. Any request presenting a client certificate signed by one of the authorities in the client-ca-file is authenticated with an identity corresponding to the CommonName of the client certificate. If this file can be changed, the Kubernetes architecture could be compromised. The scheduler will implement the changes immediately. Many of the security settings within the document are implemented through this file.
Kubernetes Security Technical Implementation Guide 2022-12-02


Check Text ( C-45724r863915_chk )
Change to the /etc/sysconfig/ directory on the Kubernetes Control Plane. Run command:
more kubelet
--client-ca-file argument
Note certificate location

If the ca-file argument location file has permissions more permissive than "644", this is a finding.
Fix Text (F-45682r821613_fix)
Change the permissions of the --client-ca-file to "644" by executing the command:

chmod 644 .