CVE-2023-25936 Explained : Impact and Mitigation

This vulnerability was published by Dell on June 23, 2023, with a CVSS base score of 5.1, indicating a medium severity level.

Understanding CVE-2023-25936

This CVE focuses on an improper input validation vulnerability found in Dell BIOS that may allow a local authenticated malicious user with administrator privileges to modify a UEFI variable.

What is CVE-2023-25936?

The CVE-2023-25936 vulnerability is present in Dell BIOS, allowing a specific type of user to exploit this weakness potentially.

The Impact of CVE-2023-25936

If successfully exploited, the vulnerability could enable an attacker to modify a UEFI variable, potentially leading to unauthorized system changes or access.

Technical Details of CVE-2023-25936

The vulnerability is classified under CWE-20: Improper Input Validation. It has a CVSS V3.1 base score of 5.1, with specific impact metrics including low availability impact, high integrity impact, and high privileges required for exploitation.

Vulnerability Description

The vulnerability arises due to improper input validation in Dell BIOS, providing an avenue for malicious actors to manipulate a UEFI variable.

Affected Systems and Versions

All versions of the CPG BIOS by Dell are impacted by this vulnerability.

Exploitation Mechanism

A local authenticated malicious user with administrator privileges can exploit this vulnerability to potentially modify UEFI variables.

Mitigation and Prevention

To mitigate the risks associated with CVE-2023-25936, it is crucial to take immediate action and implement effective long-term security practices.

Immediate Steps to Take

Monitor vendor updates and apply security patches promptly.
Restrict access to critical system components.
Conduct regular security audits to detect and address vulnerabilities.

Long-Term Security Practices

Implement the principle of least privilege to limit user access.
Educate users on best security practices to prevent unauthorized system modifications.
Utilize security tools to monitor and detect anomalous activities within the system.

Patching and Updates

Dell has released a security update addressing this vulnerability. Users are advised to refer to Dell's security advisory and apply the necessary BIOS updates to protect their systems.