Authentication bypass in NTP component in F5 BIG-IP

1) Authentication Bypass by Spoofing

EUVDB-ID: #VU27395

Risk: Low

CVSSv3.1: 3.4 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L/E:U/RL:U/RC:C]

CVE-ID: CVE-2020-11868

CWE-ID: CWE-290 - Authentication Bypass by Spoofing

Exploit availability: No

Description

The vulnerability allows a remote attacker to bypass authentication and perform a denial of service (DoS) attack.

The vulnerability exists due to ntpd allows an off-path attacker to block unauthenticated synchronization via a server mode packet with a spoofed source IP address, because transmissions are rescheduled even when a packet lacks a valid origin timestamp.A remote attacker can bypass authentication and block synchronization.

Mitigation

Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

Vulnerable software versions

BIG-IP PEM: 11.6.1 - 15.0.1.4

BIG-IP Link Controller: 11.6.1 - 15.0.1.4

BIG-IP GTM: 11.6.1 - 15.0.1.4

BIG-IP FPS: 11.6.1 - 15.0.1.4

BIG-IP DNS: 11.6.1 - 15.0.1.4

BIG-IP ASM: 11.6.1 - 15.0.1.4

BIG-IP Analytics: 11.6.1 - 15.0.1.4

BIG-IP AFM: 11.6.1 - 15.0.1.4

BIG-IP AAM: 11.6.1 - 15.0.1.4

BIG-IP LTM: 11.6.1 - 15.0.1.4

BIG-IP: 11.6.1 - 15.0.1.4

BIG-IP APM: 11.6.1 - 15.0.1.4

External links

http://support.f5.com/csp/article/K44305703

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.