CVE-2023-31421 Information

Description

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.

Reference

https://discuss.elastic.co/t/beats-elastic-agent-apm-server-and-fleet-server-8-10-1-security-update-improper-certificate-validation-issue-esa-2023-16/343385 https://www.elastic.co/community/security