CVE-2023-31421

Beats, Elastic Agent, APM Server, and Fleet Server Improper Certificate Validation issue

CVSS 5.9 MEDIUMEPSS 0.3%CWE-295

Vexday Risk Score

13Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 5.9EPSS 0.3%KEV nãoPoC —Nuclei —Metasploit —Patch —

Lifecycle

26 Oct 2023Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

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.

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected products

Elastic · APM Server Elastic · Beats Elastic · Elastic Agent Elastic · Fleet Server

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References

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