CVE-2020-8558: A security issue was discovered in kube-proxy which allows adjacent hosts to reach TCP and UDP services bound to 127.0.0.1 running on the node or in the node's network namespace. For example, if a cluster administrator runs a TCP service on a node that listens on 127.0.0.1:1234, because of this bug, that service would be potentially reachable by other hosts on the same LAN as the node, or by containers running on the same node as the service. If the example service on port 1234 required no additional authentication (because it assumed that only other localhost processes could reach it), then it could be vulnerable to attacks that make use of this bug. Fixed versions: Although the issue is caused by kube-proxy, the current fix for the issue is in kubelet (although future versions may have the fix in kube-proxy instead). We recommend updating both kubelet and kube-proxy to be sure the issue is addressed. The following versions contain the fix: kubelet/kube-proxy master - fixed by #91569 kubelet/kube-proxy v1.18.4+ - fixed by #92038 kubelet/kube-proxy v1.17.7+ - fixed by #92039 kubelet/kube-proxy v1.16.11+ - fixed by #92040
