CVE-2023-31421

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

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.

Category

5.9
CVSS
Severity: Medium
CVSS 3.1 •
EPSS 0.09%
Vendor Advisory elastic.co Vendor Advisory elastic.co
Affected: Elastic Beats
Affected: Elastic Elastic Agent
Affected: Elastic APM Server
Affected: Elastic Fleet Server
Published at:
Updated at:

References

Link Tags
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 vendor advisory
https://www.elastic.co/community/security vendor advisory

Frequently Asked Questions

What is the severity of CVE-2023-31421?
CVE-2023-31421 has been scored as a medium severity vulnerability.
How to fix CVE-2023-31421?
To fix CVE-2023-31421, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2023-31421 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2023-31421 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2023-31421?
CVE-2023-31421 affects Elastic Beats, Elastic Elastic Agent, Elastic APM Server, Elastic Fleet Server.
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