Ensure the API server makes use of strong cryptographic ciphers

Error: The API server does not make use of strong cryptographic ciphers

Bridgecrew Policy ID: BC_K8S_79
Checkov Check ID: CKV_K8S_105
Severity: CRITICAL

The API server does not make use of strong cryptographic ciphers

Description

Ensure that the API server is configured to only use strong cryptographic ciphers. TLS ciphers have had a number of known vulnerabilities and weaknesses, which can reduce the protection provided by them. By default Kubernetes supports a number of TLS ciphersuites including some that have security concerns, weakening the protection provided.

Fix - Buildtime

Kubernetes

  • Kind: Pod
apiVersion: v1
kind: Pod
metadata:
  creationTimestamp: null
  labels:
    component: kube-apiserver
    tier: control-plane
  name: kube-apiserver
  namespace: kube-system
spec:
  containers:
  - command:
+   - kube-apiserver
+   - --tls-cipher-suites=TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256
    image: gcr.io/google_containers/kube-apiserver-amd64:v1.6.0
    livenessProbe:
      failureThreshold: 8
      httpGet:
        host: 127.0.0.1
        path: /healthz
        port: 6443
        scheme: HTTPS
      initialDelaySeconds: 15
      timeoutSeconds: 15
    name: kube-apiserver-should-pass
    resources:
      requests:
        cpu: 250m
    volumeMounts:
    - mountPath: /etc/kubernetes/
      name: k8s
      readOnly: true
    - mountPath: /etc/ssl/certs
      name: certs
    - mountPath: /etc/pki
      name: pki
  hostNetwork: true
  volumes:
  - hostPath:
      path: /etc/kubernetes
    name: k8s
  - hostPath:
      path: /etc/ssl/certs
    name: certs
  - hostPath:
      path: /etc/pki
    name: pki

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