CVE-2021-3972 Security feature bypass in Notebook BIOS
An attacker with elevated privileges can bypass Secure Boot by modifying NVRAM variables via a manufacturing driver left active in Lenovo Notebook BIOS.
- 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-2021-3972?
CVE-2021-3972 is a medium-severity vulnerability in Lenovo Notebook BIOS, published on 22 Apr 2022. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A potential vulnerability by a driver used during manufacturing process on some consumer Lenovo Notebook devices' BIOS that was mistakenly not deactivated may allow an attacker with elevated privileges to modify secure boot setting by modifying an NVRAM variable.
Weakness: CWE-489
Which versions are affected by CVE-2021-3972?
It affects 105 products.
Products include Lenovo Ideapad 3-14ada05 Firmware, Lenovo Ideapad 3-14ada6 Firmware, Lenovo Ideapad 3-14alc6 Firmware, Lenovo Ideapad 3-14are05 Firmware, Lenovo Ideapad 3-14igl05 Firmware, Lenovo Ideapad 3-14iil05 Firmware and 99 more.
How do I fix CVE-2021-3972?
No fix has been published for CVE-2021-3972 yet. Limit exposure of the affected software until one is available.
Is CVE-2021-3972 being exploited?
There is no known exploitation of CVE-2021-3972 in the wild and no public exploit code.
Public exploit code: 1 proofs of concept on GitHub.
Other vulnerabilities in Lenovo Notebook BIOS
Sources
Also known as GHSA-h8xq-rx7h-94j2.