k8s-host-ports-check: Host ports should not be used

id: k8s-host-ports-check

info:
  name: Host ports should not be used
  author: princechaddha
  severity: medium
  description: Checks Kubernetes Deployments to ensure they are not configured to use host ports, which can expose the host to potential security risks.
  impact: |
    Using host ports can compromise the isolation between the host and the containers, increasing the risk of unauthorized access to host resources. This can lead to security breaches.
  remediation: |
    Avoid using host ports in Kubernetes Deployments. Use services or other networking mechanisms to expose container applications.
  reference:
    - https://kubernetes.io/docs/concepts/services-networking/service/
  tags: cloud,devops,kubernetes,devsecops,deployments,k8s,k8s-cluster-security

flow: |
  code(1);
  for (let deployment of template.items) {
    set("deployment", deployment)
    javascript(1);
  }

self-contained: true
code:
  - engine:
      - sh
      - bash
    source: kubectl get deployments --all-namespaces --output=json
    extractors:
      - type: json
        name: items
        internal: true
        json:
          - '.items[] | {name: .metadata.name, namespace: .metadata.namespace, containers: .spec.template.spec.containers}'

javascript:
  - code: |
        let deploymentData = JSON.parse(template.deployment);
        deploymentData.containers.forEach(container => {
          if (container.ports && container.ports.some(port => port.hostPort)) {
            let result = (`Deployment '${deploymentData.name}' in namespace '${deploymentData.namespace}' uses host ports.`);
            Export(result);
          }
        });

    extractors:
      - type: dsl
        dsl:
          - response
# digest: 490a0046304402202c71edff4b5b9cd6cef6f07cbd4420a429265debb788a378c9a715ec34fe32aa02205dcde3cc5ebb84dfe9be45554c68e086661ec9fb7f1de7a3e01bea7dfc904922:922c64590222798bb761d5b6d8e72950