#VU27464 Man-in-the-Middle (MitM) attack in BIG-IP APM and APM Clients - CVE-2020-5893

Vulnerability identifier: #VU27464

Vulnerability risk: Low

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

CVE-ID: CVE-2020-5893

CWE-ID: CWE-300

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
BIG-IP APM
Hardware solutions / Security hardware applicances
APM Clients
Hardware solutions / Security hardware applicances

Vendor: F5 Networks

Description

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

The vulnerability exists when a user connects to a VPN using BIG-IP Edge Client over an unsecure network, BIG-IP Edge Client responds to authentication requests over HTTP while sending probes for captive portal detection. A remote attacker can perform a man-in-the-middle attack by deploying a malicious captive portal to obtain the encrypted NT Lan Manager (NTLM) challenge response.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

BIG-IP APM: 11.6.1 - 15.1.0

APM Clients: 7.1.5 - 7.1.8

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External links
https://api-u.f5.com/support/kb-articles/K97733133?cacheFlag=false

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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.