Runs as Root (UID 0)

apiVersion: admissionregistration.k8s.io/v1
kind: ValidatingAdmissionPolicy
metadata:
  name: container-run-as-user
  annotations:
    kubeapt.io/uuid: "ba7e803d-7b0e-4505-8f47-4511091fe531"
    security.kubeapt.io/displayName: "Runs as Root (UID 0)"
    security.kubeapt.io/description: "Running a container as UID 0 gives every process the in-container root identity, so writable host mounts, setuid binaries and isolation weaknesses become exploitable with root file ownership and the full capability set."
    security.kubeapt.io/resource: "Containers"
    security.kubeapt.io/severity: "Moderate"
    security.kubeapt.io/remediation: "Set runAsUser to a non-zero UID such as 1000, or leave it unset so the image user applies. Field: spec.containers[*].securityContext.runAsUser."
    security.kubeapt.io/product: "Kubernetes"
spec:
  failurePolicy: Fail
  matchConstraints:
    resourceRules:
    - apiGroups:
      - ''
      apiVersions:
      - v1
      operations:
      - CREATE
      - UPDATE
      resources:
      - pods
  validations:
  - expression: |
      object.spec.containers.all(c,
        !has(c.securityContext) ||
        !has(c.securityContext.runAsUser) ||
        c.securityContext.runAsUser > 0
      )
    message: |
      spec.containers[*].securityContext.runAsUser must be undefined or a non-zero value (> 0).