CVE-2021-3843 : Security Advisory and Response

A potential vulnerability in the SMI function to access EEPROM in some Lenovo ThinkPad BIOS models may allow an attacker with local access and elevated privileges to execute arbitrary code.

Understanding CVE-2021-3843

This section will cover the details regarding the vulnerability and its impact.

What is CVE-2021-3843?

The vulnerability identified as CVE-2021-3843 affects Lenovo ThinkPad BIOS versions, allowing attackers with local access and elevated privileges to execute malicious code.

The Impact of CVE-2021-3843

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

Technical Details of CVE-2021-3843

Detailed technical information about the vulnerability is crucial for understanding its scope and implications.

Vulnerability Description

The vulnerability arises from improper validation of input in the SMI function, enabling unauthorized code execution on Lenovo ThinkPad BIOS.

Affected Systems and Versions

The issue affects various versions of Lenovo ThinkPad BIOS across different models.

Exploitation Mechanism

Attackers with local access and elevated privileges can exploit this vulnerability to run arbitrary code on vulnerable systems.

Mitigation and Prevention

Protecting systems from CVE-2021-3843 requires immediate action and long-term security practices.

Immediate Steps to Take

Users are advised to update the system firmware to the recommended version specified in the Lenovo advisory LEN-72619.

Long-Term Security Practices

Implement robust security measures, restrict local access, and regularly update system firmware to mitigate similar vulnerabilities.

Patching and Updates

Regularly check for firmware updates from Lenovo and apply patches promptly to secure the system.