CVE-2023-31421: Beats, Elastic Agent, APM Server, and Fleet Server 8.10.1 Security Update - Improper Certificate Validation issue (ESA-2023-16)

It was discovered that when acting as TLS clients, Beats, Elastic Agent, APM Server, and Fleet Server did not verify whether the server certificate is valid for the target IP address; however, certificate signature validation is still performed. More specifically, when the client is configured to connect to an IP address (instead of a hostname) it does not validate the server certificate’s IP SAN values against that IP address and certificate validation fails, and therefore the connection is not blocked as expected.