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The Kubernetes API Server must prohibit communication using TLS version 1.0 and 1.1, and SSL 2.0 and 3.0.


Finding ID Version Rule ID IA Controls Severity
V-242468 CNTR-K8-003350 SV-242468r864031_rule Medium
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.
Kubernetes Security Technical Implementation Guide 2022-09-13


Check Text ( C-45743r863937_chk )
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 (F-45701r863938_fix)
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.