Man-in-the-Middle (MitM) attack in F5 Networks products - CVE-2020-5917

Vulnerability identifier: #VU46077

CSH Severity: Medium

CVSS v4: 5.9 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2020-5917

CWE-ID: CWE-300

Exploitation vector: Remote access

Exploit availability: No public exploit available

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

The vulnerability exists due to the BIG-IP and BIG-IQ host OpenSSH servers use keys less than 2048 bits that are no longer considered secure. A remote attacker can perform a Man-in-the-Middle (MitM) attack and/or insecure SSH communications.

BIG-IQ Centralized Management
BIG-IP AAM
BIG-IP Link Controller
BIG-IP DNS
BIG-IP PEM
BIG-IP GTM
BIG-IP ASM
BIG-IP Analytics
BIG-IP AFM
BIG-IP APM
BIG-IP LTM
BIG-IP FPS
BIG-IP

Install updates from vendor's website.

BIG-IP AAM - addressed in versions 12.1.5.2, 14.1.2.4, 15.0.1.4, 15.1.0.5, 16.0.0
BIG-IP Link Controller - addressed in versions 12.1.5.2, 14.1.2.4, 15.0.1.4, 15.1.0.5, 16.0.0
BIG-IP PEM - addressed in versions 12.1.5.2, 14.1.2.4, 15.0.1.4, 15.1.0.5, 16.0.0
BIG-IP GTM - addressed in versions 12.1.5.2, 14.1.2.4, 15.0.1.4, 15.1.0.5, 16.0.0
BIG-IP DNS - addressed in versions 12.1.5.2, 14.1.2.4, 15.0.1.4, 15.1.0.5, 16.0.0
BIG-IP ASM - addressed in versions 12.1.5.2, 14.1.2.4, 15.0.1.4, 15.1.0.5, 16.0.0
BIG-IP Analytics - addressed in versions 12.1.5.2, 14.1.2.4, 15.0.1.4, 15.1.0.5, 16.0.0
BIG-IP AFM - addressed in versions 12.1.5.2, 14.1.2.4, 15.0.1.4, 15.1.0.5, 16.0.0
BIG-IP APM - addressed in versions 12.1.5.2, 14.1.2.4, 15.0.1.4, 15.1.0.5, 16.0.0
BIG-IP - addressed in versions 12.1.5.2, 14.1.2.4, 15.0.1.4, 15.1.0.5, 16.0.0
BIG-IP LTM - addressed in versions 12.1.5.2, 14.1.2.4, 15.0.1.4, 15.1.0.5, 16.0.0
BIG-IP FPS - addressed in versions 12.1.5.2, 14.1.2.4, 15.0.1.4, 15.1.0.5, 16.0.0

• https://support.f5.com/csp/article/K43404629

• Man-in-the-Middle (MitM) attack in F5 BIG-IP products