CVE-2020-8321 Explained : Impact and Mitigation

A potential vulnerability in the SMI callback function used in the System Lock Preinstallation driver in some Lenovo Notebook and ThinkStation models may allow arbitrary code execution.

Understanding CVE-2020-8321

This CVE involves a potential vulnerability in Lenovo systems that could lead to arbitrary code execution.

What is CVE-2020-8321?

The vulnerability lies in the SMI callback function within the System Lock Preinstallation driver on certain Lenovo Notebook and ThinkStation models, potentially enabling attackers to execute arbitrary code.

The Impact of CVE-2020-8321

The CVSS score for this vulnerability is 6.4, indicating a medium severity issue with high impacts on confidentiality, integrity, and availability of affected systems.

Technical Details of CVE-2020-8321

This section provides more in-depth technical insights into the CVE.

Vulnerability Description

The vulnerability allows for arbitrary code execution due to a flaw in the SMI callback function within the System Lock Preinstallation driver on specific Lenovo systems.

Affected Systems and Versions

Product: BIOS
Vendor: Lenovo
Versions: Various

Exploitation Mechanism

Attack Complexity: High
Attack Vector: Local
Privileges Required: High
User Interaction: None
Scope: Unchanged

Mitigation and Prevention

Protecting systems from CVE-2020-8321 requires immediate actions and long-term security practices.

Immediate Steps to Take

Update system firmware to the version specified for your model in the Product Impact section of LEN-30042.

Long-Term Security Practices

Regularly monitor for firmware updates and security advisories from Lenovo.
Implement strong access controls and network segmentation to limit the impact of potential attacks.
Conduct regular security assessments and penetration testing to identify and address vulnerabilities.

Patching and Updates

Stay informed about security patches and updates released by Lenovo to address CVE-2020-8321.