CVE-2020-5348 : Security Advisory and Response

Dell Latitude 7202 Rugged Tablet BIOS versions prior to A28 contain a UAF vulnerability in EFI_BOOT_SERVICES in system management mode, allowing a local unauthenticated attacker to execute arbitrary code.

Understanding CVE-2020-5348

This CVE involves a Use After Free vulnerability in Dell's CPG BIOS for the Latitude 7202 Rugged Tablet.

What is CVE-2020-5348?

The vulnerability in the BIOS of Dell Latitude 7202 Rugged Tablet allows attackers to overwrite the EFI_BOOT_SERVICES structure, leading to the execution of arbitrary code in system management mode.

The Impact of CVE-2020-5348

The vulnerability has a CVSS base score of 6.8, with high impacts on confidentiality, integrity, and availability. It requires low attack complexity and physical access, posing a medium severity threat.

Technical Details of CVE-2020-5348

This section provides detailed technical information about the vulnerability.

Vulnerability Description

The UAF vulnerability in EFI_BOOT_SERVICES in system management mode of Dell Latitude 7202 Rugged Tablet BIOS versions prior to A28 allows local unauthenticated attackers to execute arbitrary code.

Affected Systems and Versions

Product: CPG BIOS
Vendor: Dell
Versions Affected: Prior to A28
Version Type: Custom

Exploitation Mechanism

Attackers exploit the vulnerability by overwriting the EFI_BOOT_SERVICES structure in system management mode, enabling the execution of arbitrary code.

Mitigation and Prevention

Protecting systems from CVE-2020-5348 requires immediate actions and long-term security practices.

Immediate Steps to Take

Update the BIOS to version A28 or later to mitigate the vulnerability.
Monitor Dell's security advisories for patches and updates.

Long-Term Security Practices

Implement strict access controls to prevent unauthorized physical access to devices.
Regularly review and apply security updates and patches to all system components.
Conduct security training to educate users on identifying and reporting suspicious activities.
Utilize security tools to detect and prevent unauthorized system modifications.
Consider implementing additional security measures such as intrusion detection systems.

Patching and Updates

Regularly check for BIOS updates from Dell and apply them promptly to ensure protection against known vulnerabilities.