CVE-2021-4212 : Vulnerability Insights and Analysis
Discover the impact of CVE-2021-4212, a Lenovo BIOS vulnerability allowing arbitrary code execution. Learn mitigation steps to secure affected systems.
A potential vulnerability in the SMI callback function used in the Legacy BIOS mode driver in some Lenovo Notebook models may allow an attacker with local access and elevated privileges to execute arbitrary code.
Understanding CVE-2021-4212
This CVE details a vulnerability found in the SMI callback function within the Legacy BIOS mode driver on certain Lenovo Notebook models.
What is CVE-2021-4212?
CVE-2021-4212 is a security vulnerability in the SMI callback function of the Legacy BIOS mode driver in specific Lenovo Notebook models. This flaw could be exploited by a local attacker with elevated privileges to run arbitrary code.
The Impact of CVE-2021-4212
The impact of CVE-2021-4212 is rated as medium severity with a CVSS base score of 6.7. It poses a high risk in terms of availability, confidentiality, and integrity of affected systems. The attacker would require high privileges to exploit this vulnerability.
Technical Details of CVE-2021-4212
This section delves into the specifics of the vulnerability.
Vulnerability Description
The vulnerability lies in the SMI callback function in the Legacy BIOS mode driver used in certain Lenovo Notebook models. It could enable a local attacker with elevated privileges to execute arbitrary code.
Affected Systems and Versions
The BIOS of various Lenovo Notebook models are affected by this vulnerability.
Exploitation Mechanism
An attacker with local access and high privileges could leverage this vulnerability to execute arbitrary code.
Mitigation and Prevention
Here are the steps recommended to mitigate and prevent exploitation of CVE-2021-4212.
Immediate Steps to Take
Users should update their system firmware to the version specified for their model in the Product Impact section mentioned in the advisory.
Long-Term Security Practices
Regularly check for firmware updates from Lenovo and apply them promptly to address security vulnerabilities.
Patching and Updates
Stay informed about security advisories related to your Lenovo Notebook model to apply patches and updates in a timely manner.