services / Azure / Kubernetes mutating webhook configurations (AKS)

Cluster-wide Kubernetes mutating admission webhook configurations on an AKS managed cluster that intercept and can rewrite API objects before they are persisted.

Mutating webhooks are a primary admission enforcement and injection mechanism; controlling them is effectively cluster-admin over every workload.

Microsoft.​ContainerService/​managedClusters/​admissionregistration.​k8s.​io/​mutatingwebhookconfigurations/​delete

Deleting mutating webhook configurations removes cluster-wide admission enforcement (policy/security mutation controllers such as Pod Security or sidecar injection), disabling a defense and the access-control policy it enforced.

Risks

1. Policy destruction (CRITICAL)
2. Defense destruction (EVASION)

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.

Links