#VU27300 Improper Certificate Validation in NGINX Controller - CVE-2020-5864

Vulnerability identifier: #VU27300

Vulnerability risk: Medium

CVSSv4.0: 6.9 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2020-5864

CWE-ID: CWE-295

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
NGINX Controller
Server applications / Web servers

Vendor: F5 Networks

Description

The vulnerability allows a remote attacker to perform a man-in-the-middle (MitM) attack.

The vulnerability exists due to communication between NGINX Controller and NGINX Plus instances skip TLS verification by default. A remote attacker can perform a MitM attack and read/modify data in transit.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

NGINX Controller: 1.0.1 - 3.1.0

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External links
https://support.f5.com/csp/article/K27205552

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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.