KubernetesOverview
A container running in the host's PID namespace can inspect processes running outside the container. If the container also has access to ptrace capabilities this can be used to escalate privileges outside of the container.
There should be at least one admission control policy defined which does not permit containers to share the host PID namespace.
If you need to run containers which require hostPID, this should be defined in a separate policy and you should carefully check to ensure that only limited service accounts and users are given permission to use that policy.
Remediation guidance
Add policies to each namespace in the cluster which has user workloads to restrict the admission of hostPID containers.
Service-wide remediation
Recommended when many resources are affected: fix the platform baseline first so new resources inherit the secure setting, then remediate the existing flagged resources in batches.
Kubernetes
Use admission policies, baseline cluster configuration, GitOps templates, and namespace or workload guardrails so new deployments follow the control by default.
Operational rollout
- Fix the baseline first at the account, subscription, project, cluster, or tenant scope that owns this control.
- Remediate the currently affected resources in batches, starting with internet-exposed and production assets.
- Re-scan and track approved exceptions with an owner and expiry date.
Query logic
These are the stored checks tied to this control.
Check there are restrictions on the creation of hostPID pods
Connectors
Covered asset types
Expected check: eq []
{
pods(where: { hostPID: true NOT: { namespace: "kube-system" } }) {
...AssetFragment
}
}
