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The Kubernetes API server must use approved cipher suites.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
|---|---|---|---|---|
| V-242418 | CNTR-K8-001400 | SV-242418r799985_rule | Medium |
| Description |
|---|
| The Kubernetes API server communicates to the kubelet service on the nodes to deploy, update, and delete resources. If an attacker were able to get between this communication and modify the request, the Kubernetes cluster could be compromised. Using approved cypher suites for the communication ensures the protection of the transmitted information, confidentiality, and integrity so that the attacker cannot read or alter this communication. |
| STIG | Date |
|---|---|
| Kubernetes Security Technical Implementation Guide | 2021-11-22 |
Details
| Check Text ( C-45693r799983_chk ) |
|---|
| Change to the /etc/kubernetes/manifests/ directory on the Kubernetes Master Node. Run the command: grep -i tls-cipher-suites * If the setting feature tls-cipher-suites is not set in the Kubernetes API server manifest file or contains no value or does not contain TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384,TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384, this is a finding. |
| Fix Text (F-45651r799984_fix) |
|---|
| Edit the Kubernetes API Server manifest file in the /etc/kubernetes/manifests directory on the Kubernetes Master Node. Set the value of tls-cipher-suites to: TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384,TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384 |