IPC namespace sharing is allowed

share_host_ipc

Severity

low

Vendor

Kubernetes

Resource

General Security

Description

The host IPC namespace controls whether pod containers can be shared. You can administer cluster-level restrictions to ensure that containers remain isolated using PodSecurityPolicy and ensuring hostIPC is set to False.

Preventing sharing of host PID/IPC namespace, networking, and ports ensures proper isolation between Docker containers and the underlying host.

Examples

apiVersion: policy/v1beta1
kind: Pod
metadata:
  name: bad
spec:
  privileged: true
  allowPrivilegeEscalation: true
  allowedCapabilities:
  - '*'
  volumes:
  - '*'
  hostNetwork: false
  hostPorts:
  - min: 0
    max: 65535
  hostPID: true
  hostIPC: true (1)

1	Configuration `hostIPC` set to `true` means pod’s containers can be shared.

Mitigation / Fix

apiVersion: policy/v1beta1
kind: Pod
metadata:
  name: good
spec:
  privileged: true
  allowPrivilegeEscalation: true
  allowedCapabilities:
  - '*'
  volumes:
  - '*'
  hostNetwork: true
  hostPorts:
  - min: 0
    max: 65535
  hostPID: false
  hostIPC: false (1)

1	Configuration `hostIPC` set to `false` means pod’s containers cannot be shared.