The API server does not make use of strong cryptographic ciphers misconfiguration detected in code

Rule Details

Cortex AppSec Rule ID	APPSEC_K8S_105
Category - Subcategory	Kubernetes - Native Security Controls
Provider	OTHER
Severity	HIGH
Framework	Helm, Kubernetes, Kustomize

Impact

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.

How to Fix

Kind: Pod [source,go]

{ "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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