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The Kubernetes etcd must use TLS to protect the confidentiality of sensitive data during electronic dissemination.


Finding ID Version Rule ID IA Controls Severity
V-242379 CNTR-K8-000180 SV-242379r863955_rule Medium
Kubernetes etcd 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 "auto-tls" must be set.
Kubernetes Security Technical Implementation Guide 2022-12-02


Check Text ( C-45654r863740_chk )
Change to the /etc/kubernetes/manifests directory on the Kubernetes Control Plane. Run the command:

grep -i auto-tls *

If the setting "auto-tls" is not configured in the Kubernetes etcd manifest file or it is set to true, this is a finding.
Fix Text (F-45612r863741_fix)
Edit the Kubernetes etcd manifest file in the /etc/kubernetes/manifests directory on the Kubernetes Control Plane. Set the value of "-auto-tls" to "false".