k8s-host-network-namespace-shared: Host Network Namespace Sharing

id: k8s-host-network-namespace-shared

info:
  name: Host Network Namespace Sharing
  author: princechaddha
  severity: high
  description: Checks if containers in Kubernetes Pods are configured to share the host's network namespace, which can lead to security risks.
  impact: |
    Sharing the host's network namespace allows containers to access the host network directly. This can lead to potential security breaches as containers might bypass network policies and gain unrestricted network access on the host.
  remediation: |
    Ensure that the 'hostNetwork' field is set to false in all Kubernetes Pods to prevent containers from sharing the host's network namespace.
  reference:
    - https://kubernetes.io/docs/concepts/policy/pod-security-policy/#host-namespaces
  tags: cloud,devops,kubernetes,k8s,devsecops,namespace,k8s-cluster-security

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

self-contained: true
code:
  - engine:
      - sh
      - bash
    source: kubectl get pods --all-namespaces --output=json
    extractors:
      - type: json
        name: items
        internal: true
        json:
          - '.items[]'

javascript:
  - code: |
        pod = JSON.parse(template.pod);
        if (pod.spec.hostNetwork) {
          let result = (`Pod '${pod.metadata.name}' in namespace '${pod.metadata.namespace}' is configured to share the host's network namespace.`);
          Export(result);
        }
    extractors:
      - type: dsl
        dsl:
          - response
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