CVE-2022-40136 Explained : Impact and Mitigation

A vulnerability has been identified in some Lenovo models that could allow an attacker with local access and elevated privileges to read SMM memory through the SMI Handler. This article provides an overview of CVE-2022-40136, including its impact, technical details, and mitigation steps.

Understanding CVE-2022-40136

This section delves into the specifics of CVE-2022-40136.

What is CVE-2022-40136?

CVE-2022-40136 is an information leak vulnerability in the SMI Handler used to configure platform settings over WMI in certain Lenovo models. This flaw may be exploited by a local attacker with elevated privileges to access SMM memory.

The Impact of CVE-2022-40136

The vulnerability poses a medium severity threat with a base CVSS score of 4.4. It has a high confidentiality impact, allowing attackers to potentially access sensitive information stored in SMM memory.

Technical Details of CVE-2022-40136

This section explores the technical aspects of CVE-2022-40136.

Vulnerability Description

The vulnerability stems from an information leak in the SMI Handler, enabling unauthorized access to SMM memory on affected Lenovo models.

Affected Systems and Versions

The issue impacts various versions of the BIOS in specific Lenovo models.

Exploitation Mechanism

Attackers with local access and elevated privileges can exploit this vulnerability to read privileged system memory.

Mitigation and Prevention

Learn how to address and prevent the CVE-2022-40136 vulnerability.

Immediate Steps to Take

Users are advised to update their system firmware to the recommended version specified in Lenovo's Product Impact section of LEN-94953.

Long-Term Security Practices

Incorporate regular firmware updates and security patches into your system maintenance routine to mitigate future vulnerabilities.

Patching and Updates

Stay informed about the latest security updates and patches released by Lenovo to safeguard your system against potential threats.