The Kubernetes API server must have Alpha APIs disabled. (Cat II impact)
Kubernetes allows alpha API calls within the API server. The alpha features are disabled by default since they are not ready for production and likely to change without notice. These features may also contain security issues that are rectified as the feature matures. To keep the Kubernetes cluster secure and stable, these alpha features must not be used.
On the Control Plane, change to the manifests' directory at /etc/kubernetes/manifests and run the command: grep -i feature-gates * Review the feature-gates setting, if one is returned. If the feature-gates setting is available and contains the AllAlpha flag set to "true", this is a finding.
Edit any manifest files that contain the feature-gates setting with AllAlpha set to "true". Set the flag to "false" or remove the AllAlpha setting completely. (AllAlpha- default=false)
Rule ID: SV-242400r879530_rule
Vulnerability ID: V-242400
Group Title: SRG-APP-000033-CTR-000090
The information system enforces approved authorizations for logical access to information and system resources in accordance with applicable access control policies.