Title

The Kubernetes API Server must prohibit communication using TLS version 1.0 and 1.1, and SSL 2.0 and 3.0. (Cat II impact)

Discussion

The Kubernetes API Server will prohibit the use of SSL and unauthorized versions of TLS protocols to properly secure communication. The use of unsupported protocol exposes vulnerabilities to 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. The container platform and its components will adhere to NIST 800-52R2.

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 API Server manifest file or it is set to "VersionTLS10" or "VersionTLS11", this is a finding.

Fix Text

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

Additional Identifiers

Rule ID: SV-242468r879889_rule

Vulnerability ID: V-242468

Group Title: SRG-APP-000560-CTR-001340

Expert Comments

CCIs tied to check.

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