Kubernetes: SSRF for kube-apiserver cloudprovider scene

Report Submission Form Summary: attacker can create admissionwebhook cause ssrf in cloudprovider server. cloudprovider like GKE AKS EKS. Kubernetes Version: kubernetes v1.18.6 Component Version: Docker version 19.03.6, build 369ce74a3c Steps To Reproduce: 1. use follwing command create v1.18.6...