Vulnerability in Elastic Apm Server
CVE-2023-31421
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.
Vulnerability class: Improper Certificate Validation
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.003 (23.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 23rd percentile — 23.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: +0.001
Affected products
- Elastic Apm Server — versions 8.0.0, 8.9.2
- Elastic Apm Server
- Elastic Beats — versions 8.0.0, 8.9.2
- Elastic Agent — versions 8.0.0, 8.9.2
- Elastic Agent
- Elastic Beats
- Elastic Fleet Server
- Elastic Fleet Server — versions 8.0.0, 8.9.2
Weakness classification (CWE)
References
- discuss.elastic.co/t/beats-elastic-agent-apm-server-and-fleet-server-8-10-1-sec… (Vendor Advisory)
- www.elastic.co/community/security (Vendor Advisory)
Frequently asked questions
- What is CVE-2023-31421?
- CVE-2023-31421 is a medium-severity vulnerability in Elastic Apm Server, classified under Improper Certificate Validation. CVSS score: 5.9/10. Published 2023-10-26.
- How severe is CVE-2023-31421?
- Medium severity. CVSS v3 base score is 5.9 out of 10.