CVE-2020-5376 Explained : Impact and Mitigation

Dell Inspiron 7347 BIOS versions prior to A13 have a UEFI BIOS Boot Services overwrite vulnerability that could allow a local attacker to execute arbitrary code in System Management Mode (SMM).

Understanding CVE-2020-5376

This CVE involves a security vulnerability in Dell's CPG BIOS affecting certain versions of Dell Inspiron 7347.

What is CVE-2020-5376?

The vulnerability in Dell Inspiron 7347 BIOS versions before A13 allows a local attacker to overwrite the EFI_BOOT_SERVICES structure, potentially leading to the execution of arbitrary code in System Management Mode (SMM).

The Impact of CVE-2020-5376

The vulnerability has a CVSS base score of 6.8, indicating a medium severity issue with high impacts on confidentiality, integrity, and availability.

Technical Details of CVE-2020-5376

This section provides more technical insights into the vulnerability.

Vulnerability Description

The vulnerability involves a UEFI BIOS Boot Services overwrite issue in Dell Inspiron 7347 BIOS versions before A13.

Affected Systems and Versions

Product: CPG BIOS
Vendor: Dell
Affected Version: < A13

Exploitation Mechanism

The vulnerability can be exploited by a local attacker with access to system memory to overwrite the EFI_BOOT_SERVICES structure.

Mitigation and Prevention

To address CVE-2020-5376, follow these mitigation steps:

Immediate Steps to Take

Update the BIOS to version A13 or later.
Monitor system activity for any signs of unauthorized access.

Long-Term Security Practices

Regularly check for BIOS updates and apply them promptly.
Implement strict access controls to prevent unauthorized access to system memory.

Patching and Updates

Ensure timely installation of BIOS updates to mitigate the vulnerability effectively.