CVE-2020-8354 : Exploit Details and Defense Strategies

A potential vulnerability in the SMI callback function used in the VariableServiceSmm driver in some Lenovo Notebook models may allow arbitrary code execution.

Understanding CVE-2020-8354

This CVE involves a vulnerability in Lenovo Notebook models that could lead to arbitrary code execution.

What is CVE-2020-8354?

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

The Impact of CVE-2020-8354

The vulnerability has a CVSS base score of 6.4, indicating a medium severity level with high impacts on confidentiality, integrity, and availability. It requires high privileges and has a local attack vector.

Technical Details of CVE-2020-8354

This section provides more technical insights into the CVE.

Vulnerability Description

The vulnerability is classified as CWE-367, a Time-of-check Time-of-use (TOCTOU) Race Condition.

Affected Systems and Versions

Product: BIOS
Vendor: Lenovo
Versions: Unspecified, various

Exploitation Mechanism

The vulnerability can be exploited locally with high attack complexity and requires high privileges.

Mitigation and Prevention

Protecting systems from CVE-2020-8354 is crucial to prevent potential exploitation.

Immediate Steps to Take

Update system firmware to the version specified for your model in the Product Impact section of LEN-49266.

Long-Term Security Practices

Regularly update firmware and software to patch known vulnerabilities.
Implement strong access controls and monitoring mechanisms.
Conduct regular security assessments and audits.
Educate users on security best practices.

Patching and Updates

Ensure timely installation of firmware updates and security patches to mitigate the risk of exploitation.