CVE-2020-26186 Explained : Impact and Mitigation

Dell Inspiron 5675 BIOS versions prior to 1.4.1 contain a UEFI BIOS RuntimeServices overwrite vulnerability that could allow a local attacker to execute arbitrary code in System Management Mode (SMM).

Understanding CVE-2020-26186

This CVE involves a security vulnerability in Dell BIOS versions.

What is CVE-2020-26186?

The CVE-2020-26186 vulnerability is a UEFI BIOS RuntimeServices overwrite issue in Dell Inspiron 5675 BIOS versions before 1.4.1.

The Impact of CVE-2020-26186

The vulnerability could be exploited by a local attacker with access to system memory to execute arbitrary code in System Management Mode (SMM).

Technical Details of CVE-2020-26186

This section provides more technical insights into the CVE.

Vulnerability Description

The vulnerability allows attackers to overwrite the RuntimeServices structure in the BIOS, leading to the execution of unauthorized code in SMM.

Affected Systems and Versions

Product: CPG BIOS
Vendor: Dell
Versions Affected: < 1.4.1 (unspecified/custom)

Exploitation Mechanism

Attack Complexity: Low
Attack Vector: Physical
Privileges Required: None
Scope: Unchanged
User Interaction: None
Confidentiality Impact: High
Integrity Impact: High
Availability Impact: High

Mitigation and Prevention

Steps to address and prevent the CVE.

Immediate Steps to Take

Update BIOS to version 1.4.1 or later.
Monitor system for any unauthorized changes.

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

Dell has released a security update to address this vulnerability. Ensure to apply the necessary patches to secure the system.