CVE-2021-3786 Explained : Impact and Mitigation

A detailed overview of CVE-2021-3786, a vulnerability affecting Lenovo Notebook and ThinkPad BIOS systems.

Understanding CVE-2021-3786

This section provides insights into the nature, impact, and mitigation of CVE-2021-3786.

What is CVE-2021-3786?

The vulnerability lies in the SMI callback function used in the CSME configuration of specific Lenovo Notebook and ThinkPad systems. It enables unauthorized data extraction from the SMRAM range.

The Impact of CVE-2021-3786

With a CVSS base score of 4.4 (Medium severity), the vulnerability poses a high availability impact. Although it does not affect confidentiality or integrity, high privileges are required to exploit it.

Technical Details of CVE-2021-3786

Explore the specific technical aspects of CVE-2021-3786.

Vulnerability Description

The flaw allows data leakage from the SMRAM range in Lenovo Notebook and ThinkPad BIOS systems.

Affected Systems and Versions

Various versions of Lenovo Notebook and ThinkPad BIOS systems are impacted by this vulnerability.

Exploitation Mechanism

The vulnerability can be exploited locally with low attack complexity, requiring high privileges but no user interaction.

Mitigation and Prevention

Discover the recommended steps to mitigate and prevent exploitation of CVE-2021-3786.

Immediate Steps to Take

It is advised to update the system firmware to the specified version or newer as detailed in the Product Impact section of Lenovo advisory LEN-67440.

Long-Term Security Practices

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

Patching and Updates

Stay informed about patches and updates released by Lenovo for your specific model to enhance system security.