Validate service account before validating token.
--service-account-lookup is not enabled, the apiserver only verifies that the authentication token is valid, and does not validate that the service account token mentioned in the request is actually present in etcd. This allows using a service account token even after the corresponding service account is deleted. This is an example of time of check to time of use security issue.
- Kind: Pod
apiVersion: v1 kind: Pod metadata: creationTimestamp: null labels: component: kube-apiserver tier: control-plane name: kube-apiserver namespace: kube-system spec: containers: - command: + - kube-apiserver + - --service-account-lookup=true image: gcr.io/google_containers/kube-apiserver-amd64:v1.6.0 ...
Updated 9 months ago