#VU81680 Improper Certificate Validation in Beats - CVE-2023-31421

Vulnerability identifier: #VU81680

Vulnerability risk: Medium

CVSSv4.0: 1.7 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2023-31421

CWE-ID: CWE-295

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Beats
Server applications / Other server solutions

Vendor: Elastic Stack

Description

The vulnerability allows a remote attacker to perform MitM attack.

The vulnerability exists due to the application does not verify whether the server certificate is valid for the target IP address. 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. A remote attacker can perform MitM attack.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Beats: 8.0.0 - 8.10.0

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External links
https://www.elastic.co/community/security#ESA-2023-16

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.