CVE-2021-3972 : Vulnerability Insights and Analysis

A driver vulnerability in Lenovo Notebook BIOS could allow an attacker to modify secure boot settings by manipulating an NVRAM variable.

Understanding CVE-2021-3972

This CVE involves a potential vulnerability in the BIOS of some Lenovo Notebook devices that could be exploited by attackers with elevated privileges.

What is CVE-2021-3972?

The vulnerability stems from a driver used during the manufacturing process of certain consumer Lenovo Notebook devices. If left active, the flaw could enable attackers to alter secure boot settings.

The Impact of CVE-2021-3972

The vulnerability poses a medium severity threat with high impacts on confidentiality, integrity, and availability. An attacker with high privileges can exploit the flaw locally.

Technical Details of CVE-2021-3972

The following technical details outline the specifics of CVE-2021-3972:

Vulnerability Description

The vulnerability allows attackers with elevated privileges to modify secure boot settings by changing specific NVRAM variables.

Affected Systems and Versions

The vulnerability affects various versions of Lenovo Notebook BIOS used in consumer devices.

Exploitation Mechanism

Attackers with high privileges can exploit this vulnerability locally, enabling them to manipulate NVRAM variables to alter secure boot settings.

Mitigation and Prevention

To mitigate the risks associated with CVE-2021-3972, users can take the following steps:

Immediate Steps to Take

Update the system firmware to the version specified for your device in the Product Impact section of Lenovo advisory LEN-73440.

Long-Term Security Practices

Regularly check for firmware updates and security advisories from Lenovo to stay protected against potential vulnerabilities.

Patching and Updates

Apply patches and updates provided by Lenovo to address known vulnerabilities and enhance the security of your Lenovo Notebook devices.