CVE-2021-4211 Explained : Impact and Mitigation

A potential vulnerability in the SMI callback function used in the SMBIOS event log driver in some Lenovo Desktop, ThinkStation, and ThinkEdge models may allow an attacker with local access and elevated privileges to execute arbitrary code.

Understanding CVE-2021-4211

This section provides an overview of the CVE-2021-4211 vulnerability.

What is CVE-2021-4211?

The vulnerability in the SMI callback function used in the SMBIOS event log driver in certain Lenovo models enables a local attacker with elevated privileges to run arbitrary code.

The Impact of CVE-2021-4211

With a CVSS base score of 6.7 out of 10, this vulnerability poses a medium-severity threat affecting confidentiality, integrity, and availability. The attacker requires high privileges and local access.

Technical Details of CVE-2021-4211

This section delves into the specifics of the CVE-2021-4211 vulnerability.

Vulnerability Description

The vulnerability lies in the SMI callback function within the SMBIOS event log driver in specific Lenovo Desktop, ThinkStation, and ThinkEdge models.

Affected Systems and Versions

The vulnerability impacts various versions of the BIOS in the affected Lenovo models.

Exploitation Mechanism

To exploit this vulnerability, an attacker would need local access and elevated privileges to execute arbitrary code.

Mitigation and Prevention

Learn about the steps to mitigate and prevent CVE-2021-4211.

Immediate Steps to Take

Update the system firmware to the specified version or newer as indicated for your model in the Product Impact section in advisory LEN-77639.

Long-Term Security Practices

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

Patching and Updates

Stay proactive by applying patches and updates provided by Lenovo to address security concerns.