k8s-host-pid-namespace-sharing: Host PID Namespace Sharing

id: k8s-host-pid-namespace-sharing

info:
  name: Host PID Namespace Sharing
  author: princechaddha
  severity: critical
  description: Checks if containers in Kubernetes pods share the host's process ID namespace, which can pose a security risk.
  impact: |
    Sharing the host's PID namespace allows processes within the pod to view all of the processes on the host, potentially leading to privilege escalation and other security vulnerabilities.
  remediation: |
    Ensure that the 'hostPID' field is set to 'false' in Kubernetes Pod specifications to prevent containers from sharing the host's PID namespace.
  reference:
    - https://kubernetes.io/docs/concepts/policy/pod-security-policy/#host-namespaces
  tags: cloud,devops,kubernetes,k8s,devsecops,pods,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.hostPID) {
          let result = (`Pod '${pod.metadata.name}' in namespace '${pod.metadata.namespace}' is sharing the host's PID namespace.`);
          Export(result);
        }
    extractors:
      - type: dsl
        dsl:
          - response
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