CVE-2021-36343 : Security Advisory and Response
Discover the impact of CVE-2021-36343, an input validation flaw in Dell BIOS. Learn about affected systems, exploitation risks, and mitigation strategies to protect your devices.
Dell BIOS contains a vulnerability due to improper input validation, potentially allowing a local authenticated malicious user to execute arbitrary code in SMRAM using an SMI. The vulnerability has a CVSS base score of 7.5, indicating a high severity.
Understanding CVE-2021-36343
This section provides an overview of the CVE-2021-36343 vulnerability affecting Dell BIOS.
What is CVE-2021-36343?
The CVE-2021-36343 vulnerability is an improper input validation issue in Dell BIOS that could be exploited by a local authenticated attacker to achieve arbitrary code execution in System Management RAM (SMRAM).
The Impact of CVE-2021-36343
The impact of CVE-2021-36343 is significant, with a CVSS base score of 7.5, indicating high severity. An attacker could potentially gain access to sensitive data, manipulate system integrity, and disrupt system availability.
Technical Details of CVE-2021-36343
In this section, we delve into the technical details of the CVE-2021-36343 vulnerability affecting Dell BIOS.
Vulnerability Description
The vulnerability arises from improper input validation in Dell BIOS, enabling a local authenticated malicious user to trigger arbitrary code execution in SMRAM.
Affected Systems and Versions
The vulnerability impacts Dell systems running CPG BIOS versions prior to 1.14.
Exploitation Mechanism
A malicious actor with local authenticated access can exploit this vulnerability by utilizing an SMI to execute arbitrary code in SMRAM.
Mitigation and Prevention
To mitigate the risks associated with CVE-2021-36343, immediate actions and long-term security practices are essential.
Immediate Steps to Take
Users should apply patches released by Dell to address the vulnerability. Additionally, restricting local access and monitoring SMI activities can help prevent exploitation.
Long-Term Security Practices
Implementing least privilege principles, conducting regular security training, and staying informed about BIOS security best practices are crucial for long-term security.
Patching and Updates
Regularly check for security updates from Dell and apply them promptly to ensure the protection of systems from known vulnerabilities.