The Kubernetes Scheduler must use TLS 1.2, at a minimum, to protect the confidentiality of sensitive data during electronic dissemination.

The Kubernetes Scheduler will prohibit the use of SSL and unauthorized versions of TLS protocols to properly secure communication.

The use of unsupported protocol exposes vulnerabilities to the Kubernetes by rogue traffic interceptions, man-in-the-middle attacks, and impersonation of users or services from the container platform runtime, registry, and keystore. To enable the minimum version of TLS to be used by the Kubernetes API Server, the setting "tls-min-version" must be set.

Change to the /etc/kubernetes/manifests/ directory on the Kubernetes Control Plane. Run the command:

grep -i tls-min-version *

If the setting "tls-min-version" is not configured in the Kubernetes Scheduler manifest file or it is set to "VersionTLS10" or "VersionTLS11", this is a finding.

Edit the Kubernetes Scheduler manifest file in the /etc/kubernetes/manifests directory on the Kubernetes Control Plane. Set the value of "--tls-min-version" to "VersionTLS12" or higher.