services / Azure / Kubernetes ClusterRoleBindings (Fleet)

ClusterRoleBindings are cluster-wide Kubernetes RBAC objects that bind subjects (users, groups, service accounts) to ClusterRoles, granting cluster-scoped permissions across an AKS Fleet's member clusters.

Cluster-wide access-control; writing grants cluster-admin (privilege escalation), making this the most security-sensitive RBAC primitive.

Microsoft.​ContainerService/​fleets/​rbac.​authorization.​k8s.​io/​clusterrolebindings/​write

Creating/updating a ClusterRoleBinding can bind any subject (including attacker-controlled identities) to cluster-admin, the canonical Kubernetes privilege escalation and a durable persistence mechanism.

Risks

1. Privilege escalation (CRITICAL)
2. Account persistence (BOOST)

Scope: CRITICAL

This privilege may grant access to sensitive data from a significant fraction of organizational functions, allow interruption of critical organizational services, or its exploit could lead to significant privilege escalation.

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