V-242450—The Kubernetes Kubelet certificate authority must be owned by root.
CAT II - Medium
CNTR-K8-003170
>Control Description
The Kubernetes kube proxy kubeconfig contain the argument and setting for the Control Planes. These settings contain network rules for restricting network communication between pods, clusters, and networks. If these files can be changed, data traversing between the Kubernetes Control Panel components would be compromised. Many of the security settings within the document are implemented through this file.
>Check Content
On the Control Plane,
$ps -ef | grep kubeletIf the "client-ca-file" option exists, this is a finding. Note the path to the config file (identified by --config).
$grep -i clientCAFile <path_to_config_file>Note the path to the client ca file.
$stat -c %U:%G <path_to_client_ca_file>If the command returns any non root:root file permissions, this is a finding.
>Remediation
On the Control Plane,
$ps -ef | grep kubeletRemove the "client-ca-file" option. Note the path to the config file (identified by --config).
$grep -i clientCAFile <path_to_config_file>Note the path to the client ca file.
$chown root:root <path_to_client_ca_file>>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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