CVE-2022-40134 : Exploit Details and Defense Strategies

An information leak vulnerability in the SMI Set BIOS Password SMI Handler in some Lenovo models may allow an attacker with local access and elevated privileges to read SMM memory.

Understanding CVE-2022-40134

This section will provide insights into the CVE-2022-40134 vulnerability.

What is CVE-2022-40134?

The CVE-2022-40134 is an information leak vulnerability in the SMI Set BIOS Password SMI Handler in certain Lenovo models, enabling a local attacker with elevated privileges to access SMM memory.

The Impact of CVE-2022-40134

The vulnerability poses a medium threat level with high confidentiality impact, allowing unauthorized access to sensitive system memory.

Technical Details of CVE-2022-40134

This section will delve into the technical aspects of the CVE-2022-40134 vulnerability.

Vulnerability Description

The vulnerability arises from an out-of-bounds read issue (CWE-125) in the SMI Set BIOS Password SMI Handler, potentially leading to information disclosure.

Affected Systems and Versions

The vulnerability affects various versions of the BIOS on Lenovo models, putting systems at risk if attackers gain local access and elevated privileges.

Exploitation Mechanism

To exploit CVE-2022-40134, attackers need local access and elevated privileges to read SMM memory, potentially compromising system confidentiality.

Mitigation and Prevention

This section will outline steps to mitigate and prevent exploitation of CVE-2022-40134.

Immediate Steps to Take

Users should update system firmware to the recommended version listed in the Product Impact section of LEN-94953 to mitigate the vulnerability.

Long-Term Security Practices

Implement robust access controls, regular security updates, and monitor system memory accesses to enhance long-term security.

Patching and Updates

Regularly apply firmware updates and security patches provided by Lenovo to address known vulnerabilities and strengthen system security.