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The Kubernetes API server must have Alpha APIs disabled.


Finding ID Version Rule ID IA Controls Severity
V-242400 CNTR-K8-000470 SV-242400r863976_rule Medium
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.
Kubernetes Security Technical Implementation Guide 2022-12-02


Check Text ( C-45675r863799_chk )
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.
Fix Text (F-45633r712555_fix)
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)