Man-in-the-Middle (MitM) attack in F5 BIG-IP APM and APM Clients

1) Man-in-the-Middle (MitM) attack

EUVDB-ID: #VU27464

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 - Channel Accessible by Non-Endpoint ('Man-in-the-Middle')

Exploit availability: No

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

CPE2.3

• cpe:2.3:h:f5_networks:big-ip_apm:11.6.1:*:*:*:*:*:*:*
• cpe:2.3:h:f5_networks:big-ip_apm:11.6.2:*:*:*:*:*:*:*
• cpe:2.3:h:f5_networks:big-ip_apm:11.6.3:*:*:*:*:*:*:*
• cpe:2.3:h:f5_networks:big-ip_apm_client:7.1.5:*:*:*:*:*:*:*
• cpe:2.3:h:f5_networks:big-ip_apm_client:7.1.6:*:*:*:*:*:*:*
• cpe:2.3:h:f5_networks:big-ip_apm_client:7.1.7:*:*:*:*:*:*:*

External links

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

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.