CVE-2023-45076 Explained : Impact and Mitigation

A memory leakage vulnerability was reported in the 534D0140 DXE driver of Lenovo BIOS, allowing a local attacker with elevated privileges to write to NVRAM variables.

Understanding CVE-2023-45076

This section will provide insights into the nature of CVE-2023-45076.

What is CVE-2023-45076?

CVE-2023-45076 is a memory leakage vulnerability in the 534D0140 DXE driver that enables a local attacker with elevated privileges to manipulate NVRAM variables.

The Impact of CVE-2023-45076

The vulnerability poses a medium severity risk with high impacts on confidentiality, integrity, and availability of affected systems.

Technical Details of CVE-2023-45076

Here, we delve into the technical aspects of CVE-2023-45076.

Vulnerability Description

The vulnerability allows attackers to write to NVRAM variables, potentially leading to unauthorized system modifications and data exposure.

Affected Systems and Versions

The BIOS firmware across various versions of Lenovo systems is affected by this vulnerability.

Exploitation Mechanism

The vulnerability can be exploited by a local attacker with elevated privileges to manipulate NVRAM variables, impacting system integrity.

Mitigation and Prevention

This section covers the measures to mitigate and prevent CVE-2023-45076.

Immediate Steps to Take

Users are advised to update their system firmware to the recommended version to remediate the vulnerability.

Long-Term Security Practices

Regularly update system firmware and implement security best practices to safeguard against similar vulnerabilities.

Patching and Updates

Refer to Lenovo's security advisory (https://support.lenovo.com/us/en/product_security/LEN-141775) for specific firmware versions that address the CVE-2023-45076 vulnerability.