PSP with unrestricted access to host path

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Metadata

Id: de4421f1-4e35-43b4-9783-737dd4e4a47e

Cloud Provider: Kubernetes

Platform: Kubernetes

Severity: High

Category: Resource Management

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Description

PodSecurityPolicy should set readOnly to true for every entry in spec.allowedHostPaths. The spec.allowedHostPaths attribute must be defined and not null, and each allowed host path must include readOnly: true. Entries with readOnly undefined or set to false, or a missing spec.allowedHostPaths, are reported.

Compliant Code Examples

apiVersion: policy/v1beta1
kind: PodSecurityPolicy
metadata:
  name: example
spec:
  hostIPC: false
  allowedHostPaths:
    - pathPrefix: "/foo"
      readOnly: true
  runAsUser:
    rule: 'RunAsAny'
  seLinux:
    rule: 'RunAsAny'
  supplementalGroups:
    rule: 'RunAsAny'
  fsGroup:
    rule: 'RunAsAny'

Non-Compliant Code Examples

apiVersion: policy/v1beta1
kind: PodSecurityPolicy
metadata:
  name: example
spec:
  hostIPC: false
  allowedHostPaths:
  - pathPrefix: /dev
  runAsUser:
    rule: 'RunAsAny'
  seLinux:
    rule: 'RunAsAny'
  supplementalGroups:
    rule: 'RunAsAny'
  fsGroup:
    rule: 'RunAsAny'

apiVersion: policy/v1beta1
kind: PodSecurityPolicy
metadata:
  name: example
spec:
  hostIPC: false
  allowedHostPaths:
  - pathPrefix: /dev
    readOnly: false
  runAsUser:
    rule: 'RunAsAny'
  seLinux:
    rule: 'RunAsAny'
  supplementalGroups:
    rule: 'RunAsAny'
  fsGroup:
    rule: 'RunAsAny'

apiVersion: policy/v1beta1
kind: PodSecurityPolicy
metadata:
  name: example
spec:
  hostIPC: false
  runAsUser:
    rule: 'RunAsAny'
  seLinux:
    rule: 'RunAsAny'
  supplementalGroups:
    rule: 'RunAsAny'
  fsGroup:
    rule: 'RunAsAny'