In etcd before versions 3.3.23 and 3.4.10, the etcd gateway is a simple TCP proxy to allow for basic service discovery and access. However, it is possible to include the gateway address as an endpoint. This results in a denial of service, since the endpoint can become stuck in a loop of requesting itself until there are no more available file descriptors to accept connections on the gateway.
{ "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro", "ubuntu_priority": "medium", "binaries": [ { "binary_version": "3.2.17+dfsg-1ubuntu0.1+esm1", "binary_name": "etcd" }, { "binary_version": "3.2.17+dfsg-1ubuntu0.1+esm1", "binary_name": "etcd-client" }, { "binary_version": "3.2.17+dfsg-1ubuntu0.1+esm1", "binary_name": "etcd-client-dbgsym" }, { "binary_version": "3.2.17+dfsg-1ubuntu0.1+esm1", "binary_name": "etcd-server" }, { "binary_version": "3.2.17+dfsg-1ubuntu0.1+esm1", "binary_name": "etcd-server-dbgsym" }, { "binary_version": "3.2.17+dfsg-1ubuntu0.1+esm1", "binary_name": "golang-etcd-server-dev" } ] }
{ "availability": "No subscription required", "ubuntu_priority": "medium", "binaries": [ { "binary_version": "3.2.26+dfsg-6ubuntu0.1", "binary_name": "etcd" }, { "binary_version": "3.2.26+dfsg-6ubuntu0.1", "binary_name": "etcd-client" }, { "binary_version": "3.2.26+dfsg-6ubuntu0.1", "binary_name": "etcd-client-dbgsym" }, { "binary_version": "3.2.26+dfsg-6ubuntu0.1", "binary_name": "etcd-server" }, { "binary_version": "3.2.26+dfsg-6ubuntu0.1", "binary_name": "etcd-server-dbgsym" }, { "binary_version": "3.2.26+dfsg-6ubuntu0.1", "binary_name": "golang-etcd-server-dev" } ] }