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The Kubernetes kubeadm.conf must have file permissions set to 644 or more restrictive.


Finding ID Version Rule ID IA Controls Severity
V-242455 CNTR-K8-003220 SV-242455r754822_rule Medium
The Kubernetes kubeadm.conf contains sensitive information regarding the cluster nodes configuration. If this file can be modified, the Kubernetes Platform Plane would be degraded or compromised for malicious intent. Many of the security settings within the document are implemented through this file.
Kubernetes Security Technical Implementation Guide 2022-12-02


Check Text ( C-45730r754820_chk )
Review the kubeadm.conf file :

Get the path for kubeadm.conf by running:
systemctl status kubelet

Note the configuration file installed by the kubeadm is written to
(Default Location: /etc/systemd/system/kubelet.service.d/10-kubeadm.conf)
stat -c %a

If the file has permissions more permissive than "644", this is a finding.
Fix Text (F-45688r754821_fix)
Change the permissions of kubeadm.conf to "644" by executing the command:

chmod 644