CVE-2021-3599 : Exploit Details and Defense Strategies
Discover the impact and mitigation steps for CVE-2021-3599, a critical vulnerability in Lenovo ThinkPad BIOS allowing arbitrary code execution by attackers with local access.
A potential vulnerability in the SMI callback function used to access flash device in some Lenovo ThinkPad models may allow an attacker with local access and elevated privileges to execute arbitrary code.
Understanding CVE-2021-3599
This CVE describes a vulnerability in the ThinkPad BIOS of Lenovo systems that could be exploited by an attacker with local access and high privileges to run arbitrary code.
What is CVE-2021-3599?
The CVE-2021-3599 vulnerability exists in the SMI callback function of certain Lenovo ThinkPad models. It enables a local attacker with elevated privileges to execute arbitrary code, posing a serious security risk.
The Impact of CVE-2021-3599
The impact of CVE-2021-3599 is rated as high, with a CVSS v3.1 base score of 6.7. It can lead to the compromise of confidentiality, integrity, and availability of affected systems, emphasizing the critical nature of this vulnerability.
Technical Details of CVE-2021-3599
This section provides technical details regarding the vulnerability to enhance understanding and mitigation strategies.
Vulnerability Description
The vulnerability in the SMI callback function of some Lenovo ThinkPad BIOS versions allows attackers to execute arbitrary code when they have local access and elevated privileges on the system.
Affected Systems and Versions
The affected product is the ThinkPad BIOS by Lenovo, with various versions being vulnerable to this exploit.
Exploitation Mechanism
To exploit this vulnerability, an attacker needs local access and elevated privileges on the target system. By leveraging the flaw in the SMI callback function, the attacker can execute malicious code.
Mitigation and Prevention
To secure systems from CVE-2021-3599, immediate actions and long-term security practices are recommended.
Immediate Steps to Take
Update the system firmware to the version provided in the Product Impact section of LEN-67440 or newer to mitigate the vulnerability.
Long-Term Security Practices
Implement strict access controls, regularly update firmware and security patches, and conduct security assessments to prevent future vulnerabilities.
Patching and Updates
Stay informed about security updates and patches released by Lenovo to address CVE-2021-3599 and other potential vulnerabilities.