Vulnerability identifier: #VU50609

Vulnerability risk: Low

CVSSv3.1: 3.7 [CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-22981

CWE-ID: CWE-310

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
BIG-IP
Hardware solutions / Firmware
BIG-IP DDHD
Hardware solutions / Firmware
BIG-IP SSLO
Hardware solutions / Firmware
BIG-IP LTM
Hardware solutions / Security hardware applicances
BIG-IP AFM
Hardware solutions / Security hardware applicances
BIG-IP Analytics
Hardware solutions / Security hardware applicances
BIG-IP APM
Hardware solutions / Security hardware applicances
BIG-IP ASM
Hardware solutions / Security hardware applicances
BIG-IP FPS
Hardware solutions / Security hardware applicances
BIG-IP GTM
Hardware solutions / Security hardware applicances
BIG-IP PEM
Hardware solutions / Security hardware applicances
BIG-IP AAM
Hardware solutions / Routers & switches, VoIP, GSM, etc
BIG-IP DNS
Hardware solutions / Routers & switches, VoIP, GSM, etc
BIG-IP Link Controller
Hardware solutions / Routers & switches, VoIP, GSM, etc
BIG-IP Advanced WAF
Client/Desktop applications / Antivirus software/Personal firewalls

Vendor: F5 Networks

Description

The vulnerability allows a remote attacker to perform MitM attack.

The vulnerability exists due to the original TLS protocol includes a weakness in the master secret negotiation that is mitigated by the Extended Master Secret (EMS) extension defined in RFC 7627. TLS connections that do not use EMS are vulnerable to man-in-the-middle attacks during renegotiation.

Mitigation

Install updates from vendor's website.

The issue is fixed starting from 13.0.0 branch.

Vulnerable software versions

BIG-IP: 12.1.0 - 12.1.5.2, 11.6.1 - 11.6.5.2

BIG-IP LTM: 11.6.1 - 12.1.5.2

BIG-IP AAM: 11.6.1 - 12.1.5.2

BIG-IP Advanced WAF: 11.6.1 - 12.1.5.2

BIG-IP AFM: 11.6.1 - 12.1.5.2

BIG-IP Analytics: 11.6.1 - 12.1.5.2

BIG-IP APM: 11.6.1 - 12.1.5.2

BIG-IP ASM: 11.6.1 - 12.1.5.2

BIG-IP DDHD: 11.6.1 - 12.1.5.2

BIG-IP DNS: 11.6.1 - 12.1.5.2

BIG-IP FPS: 11.6.1 - 12.1.5.2

BIG-IP GTM: 11.6.1 - 12.1.5.2

BIG-IP Link Controller: 11.6.1 - 12.1.5.2

BIG-IP PEM: 11.6.1 - 12.1.5.2

BIG-IP SSLO: 11.6.1 - 12.1.5.2

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External links
http://support.f5.com/csp/article/K09121542

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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.