Caddy Web Server Exposure of Sensitive Information to an Unauthorized Actor Vulnerability - CVE-2018-19148

Caddy through 0.11.0 sends incorrect certificates for certain invalid requests making it easier for attackers to enumerate hostnames. Specifically when unable to match a Host header with a vhost in its configuration it serves the X.509 certificate for a randomly selected vhost in its configuration. Repeated requests (with a nonexistent hostname in the Host header) permit full enumeration of all certificates on the server. This generally permits an attacker to easily and accurately discover the existence of and relationships among hostnames that weren39t meant to be public though this information could likely have been discovered via other methods with additional effort.