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


Finding ID Version Rule ID IA Controls Severity
V-242460 CNTR-K8-003270 SV-242460r864025_rule Medium
The Kubernetes conf files contain the arguments and settings for the Control Plane services. These services are controller and scheduler. If these files can be changed, the scheduler will be implementing the changes immediately.
Kubernetes Security Technical Implementation Guide 2022-12-02


Check Text ( C-45735r712734_chk )
Review the permissions of the Kubernetes config files by using the command:

stat -c %a /etc/kubernetes/admin.conf
stat -c %a /etc/kubernetes/scheduler.conf
stat -c %a /etc/kubernetes/controller-manager.conf

If any of the files are have permissions more permissive than "644", this is a finding.
Fix Text (F-45693r712735_fix)
Change the permissions of the conf files to "644" by executing the command:

chmod 644 /etc/kubernetes/admin.conf
chmod 644 /etc/kubernetes/scheduler.conf
chmod 644 /etc/kubernetes/controller-manager.conf