MitM-attack in BIG-IP SSL/TLS implementation

1) Cryptographic issues

EUVDB-ID: #VU50609

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 - Cryptographic Issues

Exploit availability: No

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: 11.6.1 - 12.1.5.2

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

External links

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

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.