Improper certificate revocation in curl implementation within Command Line Interface, EAV Monitors and iRules components in F5 BIG-IP products



Published: 2021-02-19

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Improper Check for Certificate Revocation

EUVDB-ID: #VU48895

Risk: Medium

CVSSv3.1: 5.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-8286

CWE-ID: CWE-299 - Improper Check for Certificate Revocation

Exploit availability: No

Description

The vulnerability allows a remote attacker to bypass implemented security restrictions.

The vulnerability exists due to incorrectly implemented checks for OCSP stapling. A remote attacker can provide a fraudulent OCSP response that would appear fine, instead of the real one.

Mitigation

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

Vulnerable software versions

BIG-IP DNS: 13.1.0 - 16.0.1.1

BIG-IP SSLO: 13.1.0 - 16.0.1.1

BIG-IP PEM: 13.1.0 - 16.0.1.1

BIG-IP Link Controller: 13.1.0 - 16.0.1.1

BIG-IP GTM: 13.1.0 - 16.0.1.1

BIG-IP FPS: 13.1.0 - 16.0.1.1

BIG-IP DDHD: 13.1.0 - 16.0.1.1

BIG-IP ASM: 13.1.0 - 16.0.1.1

BIG-IP Analytics: 13.1.0 - 16.0.1.1

BIG-IP AFM: 13.1.0 - 16.0.1.1

BIG-IP Advanced WAF: 13.1.0 - 16.0.1.1

BIG-IP AAM: 13.1.0 - 16.0.1.1

BIG-IP LTM: 13.1.0 - 16.0.1.1

BIG-IP: 13.1.0 - 16.0.1.1

BIG-IP APM: 13.1.0 - 16.0.1.1

External links

http://support.f5.com/csp/article/K15402727


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected device in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.



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