CVE-2020-3455 Cisco FXOS Software for Firepower 4100/9300 Series Appliances Secure Boot Bypass Vulnerability

Medium 6.7 Published 21 Oct 2020 Updated 13 Nov 2024

An authenticated local attacker can bypass secure boot to inject persistent code into Cisco FXOS devices, compromising the boot chain of trust.

Exploited in the wild: Not known
Login needed: An administrator
Attackable: Local or same network only
Victim action needed: Not needed
Fix: None listed

What is CVE-2020-3455?

CVE-2020-3455 is a medium-severity vulnerability in Cisco Firepower Extensible Operating System, published on 21 Oct 2020. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

A vulnerability in the secure boot process of Cisco FXOS Software could allow an authenticated, local attacker to bypass the secure boot mechanisms. The vulnerability is due to insufficient protections of the secure boot process. An attacker could exploit this vulnerability by injecting code into a specific file that is then referenced during the device boot process. A successful exploit could allow the attacker to break the chain of trust and inject code into the boot process of the device which would be executed at each boot and maintain persistence across reboots.

Weakness: CWE-693

Which versions are affected by CVE-2020-3455?

It affects 1 product.

Products include Cisco Firepower Extensible Operating System.

How do I fix CVE-2020-3455?

No fix has been published for CVE-2020-3455 yet. Limit exposure of the affected software until one is available.

Is CVE-2020-3455 being exploited?

There is no known exploitation of CVE-2020-3455 in the wild and no public exploit code.

All Cisco Firepower Extensible Operating System vulnerabilities

Sources

Also known as GHSA-4c77-wcw2-9gh7.