V-242407—The Kubernetes KubeletConfiguration files must have file permissions set to 644 or more restrictive.
CAT II - Medium
CNTR-K8-000890
>Control Description
The kubelet configuration file contains the runtime configuration of the kubelet service. If an attacker can gain access to this file, changes can be made to open vulnerabilities and bypass user authorizations inherit within Kubernetes with RBAC implemented.
>Check Content
On the Kubernetes Control Plane and Worker nodes,
$ps -ef | grep kubelet Check the config file (path identified by: --config): Change to the directory identified by --config (example /etc/sysconfig/) and$ls -l kubelet Each KubeletConfiguration file must have permissions of "644" or more restrictive.If any KubeletConfiguration file is less restrictive than "644", this is a finding.
>Remediation
On the Kubernetes Control Plane and Worker nodes,
$ps -ef | grep kubelet Check the config file (path identified by: --config): Change to the directory identified by --config (example /etc/sysconfig/) and$chmod 644 kubelet To verify the change took place,$ls -l kubeletThe kubelet file should now have the permissions of "644".
>CCI References
Control Correlation Identifiers (CCIs) map STIG findings to NIST 800-53 controls.
>Cross-Framework Mappings
NIST SP 800-53 r5
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