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

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-242376	CNTR-K8-000150	SV-242376r712484_rule		Medium

Description
The Kubernetes Controller Manager 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 key store. To enable the minimum version of TLS to be used by the Kubernetes Controller Manager, the setting "tls-min-version" must be set.

Description

The Kubernetes Controller Manager 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 key store. To enable the minimum version of TLS to be used by the Kubernetes Controller Manager, the setting "tls-min-version" must be set.

STIG	Date
Kubernetes Security Technical Implementation Guide	2021-04-14

Details

Check Text ( C-45651r712482_chk )
Change to the /etc/kubernetes/manifests/ directory on the Kubernetes Master Node. Run the command: grep -i tls-min-version * If the setting "tls-min-version" is not configured in the Kubernetes Controller Manager manifest file or it is set to "VersionTLS10" or "VersionTLS11", this is a finding.

Fix Text (F-45609r712483_fix)
Edit the Kubernetes Controller Manager manifest file in the /etc/kubernetes/manifests directory on the Kubernetes Master Node. Set the value of "--tls-min-version" to "VersionTLS12" or higher.