MitM attack in Elastic Beats

1) Improper Certificate Validation

EUVDB-ID: #VU81680

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 - Improper Certificate Validation

Exploit availability: No

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

CPE2.3

• cpe:2.3:a:elastic_stack:beats:8.0.0:*:*:*:*:*:*:*
• cpe:2.3:a:elastic_stack:beats:8.0.1:*:*:*:*:*:*:*
• cpe:2.3:a:elastic_stack:beats:8.1.0:*:*:*:*:*:*:*

External links

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

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.