RBAC roles allow privilege escalation

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Metadata

Id: 8320826e-7a9c-4b0b-9535-578333193432

Cloud Provider: k8s

Framework: Kubernetes

Severity: Medium

Category: Access Control

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Description

Roles or ClusterRoles with bind or escalate permissions allow subjects to create new bindings with other roles. This is dangerous, as users with these privileges can bind to roles that may exceed their own privileges.

Compliant Code Examples

apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
  name: not-rbac-binder
rules:
- apiGroups: ["rbac.authorization.k8s.io"]
  resources: ["clusterrolebindings"]
  verbs: ["create"]

Non-Compliant Code Examples

apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
  name: rbac-binder
rules:
- apiGroups: ["rbac.authorization.k8s.io"]
  resources: ["clusterroles"]
  verbs: ["bind"]
- apiGroups: ["rbac.authorization.k8s.io"]
  resources: ["clusterrolebindings"]
  verbs: ["create"]