CVE-2021-36342 : Vulnerability Insights and Analysis
Learn about CVE-2021-36342, a high-severity vulnerability in Dell BIOS allowing local authenticated users to execute arbitrary code in SMRAM. Find mitigation steps and updates here.
Dell BIOS contains an improper input validation vulnerability that can be exploited by a local authenticated malicious user. This could lead to arbitrary code execution in SMRAM.
Understanding CVE-2021-36342
This CVE identifies a vulnerability present in Dell BIOS, affecting versions below 1.14. The vulnerability allows a local authenticated user to exploit the BIOS through an SMI, potentially resulting in arbitrary code execution.
What is CVE-2021-36342?
CVE-2021-36342 is a high-severity vulnerability in Dell BIOS due to improper input validation. An attacker with local access could leverage this vulnerability to execute arbitrary code within the SMRAM.
The Impact of CVE-2021-36342
The impact of this vulnerability is rated as high, with a CVSS base score of 7.5. It poses a significant risk to confidentiality, integrity, and availability, with high privileges required for exploitation.
Technical Details of CVE-2021-36342
CVE-2021-36342 is classified under CWE-119, indicating improper restriction of operations within the bounds of a memory buffer.
Vulnerability Description
The vulnerability stems from Dell BIOS's improper input validation, allowing a local authenticated user to gain arbitrary code execution within SMRAM through an SMI.
Affected Systems and Versions
The affected product is CPG BIOS by Dell, with versions lower than 1.14 being vulnerable to exploitation.
Exploitation Mechanism
A local authenticated user can exploit this vulnerability by using an SMI to execute arbitrary code within the SMRAM.
Mitigation and Prevention
To mitigate the risks associated with CVE-2021-36342, immediate steps should be taken along with implementing long-term security practices and regular patching.
Immediate Steps to Take
Users should update their Dell BIOS to version 1.14 or newer, if available. Restricting physical access to the system can also help prevent unauthorized exploitation.
Long-Term Security Practices
Implementing strong access controls, regularly monitoring BIOS integrity, and applying security best practices are essential for long-term security.
Patching and Updates
Stay informed about security updates from Dell and promptly apply patches to address vulnerabilities and enhance system security.