Title

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

Discussion

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.

Check Content

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.

Fix Text

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.

Additional Identifiers

Rule ID: SV-242377r879519_rule

Vulnerability ID: V-242377

Group Title: SRG-APP-000014-CTR-000035

Expert Comments

CCIs tied to check.

Controls tied to check. These are derived from the CCIs shown above.