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.
Source: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-15114
Reference (s):
- https://github.com/etcd-io/etcd/security/advisories/GHSA-2xhq-gv6c-p224
- URL: https://github.com/etcd-io/etcd/security/advisories/GHSA-2xhq-gv6c-p224
- FEDORA:FEDORA-2020-cd43b84c16
- URL: https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/L6B6R43Y7M3DCHWK3L3UVGE2K6WWECMP/