| name | cis-gke-autopilot-v130-4.1.5 |
| description | Ensure that Service Account Tokens are only mounted where necessary (Manual) |
| category | cis-gke-autopilot |
| version | 1.3.0 |
| author | cyberstrike-official |
| tags | ["cis","gke-autopilot","kubernetes","gcp","rbac","service-accounts","service-account-tokens"] |
| cis_id | 4.1.5 |
| cis_benchmark | CIS Google Kubernetes Engine (GKE) Autopilot Benchmark v1.3.0 |
| tech_stack | ["kubernetes","gcp","gke"] |
| cwe_ids | [] |
| chains_with | [] |
| prerequisites | [] |
| severity_boost | {} |
4.1.5 Ensure that Service Account Tokens are only mounted where necessary (Manual)
Profile Applicability
Description
Service accounts tokens should not be mounted in pods except where the workload running in the pod explicitly needs to communicate with the API server.
Rationale
Mounting service account tokens inside pods can provide an avenue for privilege escalation attacks where an attacker is able to compromise a single pod in the cluster.
Avoiding mounting these tokens removes this attack avenue.
Impact
Pods mounted without service account tokens will not be able to communicate with the API server, except where the resource is available to unauthenticated principals.
Audit
Review pod and service account objects in the cluster and ensure that the option below is set, unless the resource explicitly requires this access.
automountServiceAccountToken: false
Remediation
Modify the definition of pods and service accounts which do not need to mount service account tokens to disable it.
Default Value
By default, all pods get a service account token mounted in them.
References
- https://kubernetes.io/docs/tasks/configure-pod-container/configure-service-account/
CIS Controls
| Controls Version | Control | IG 1 | IG 2 | IG 3 |
|---|
| v8 | 4.8 Uninstall or Disable Unnecessary Services on Enterprise Assets and Software | | * | * |
| v7 | 14.7 Enforce Access Control to Data through Automated Tools | | | * |
