CVE-2018-3968 : Security Advisory and Response

Das U-Boot vulnerability affecting versions 2013.07-rc1 to 2014.07-rc2 allows attackers to bypass verified boot protection, potentially leading to unauthorized kernel execution.

Understanding CVE-2018-3968

This CVE involves a vulnerability in Das U-Boot's verified boot protection mechanism.

What is CVE-2018-3968?

The vulnerability in Das U-Boot versions 2013.07-rc1 to 2014.07-rc2 enables attackers to circumvent the FIT signature enforcement, permitting the execution of an unsigned kernel within a legacy image format.

The Impact of CVE-2018-3968

CVSS Base Score: 8.2 (High)
Attack Vector: Local
Attack Complexity: Low
Privileges Required: High
Confidentiality Impact: High
Integrity Impact: High
Availability Impact: High
Scope: Changed
User Interaction: None

Technical Details of CVE-2018-3968

Das U-Boot vulnerability specifics and affected systems.

Vulnerability Description

The flaw allows local attackers to provide a boot image, bypassing U-Boot's verified boot feature.

Affected Systems and Versions

Product: Das U-Boot
Versions: 2013.07-rc1 to 2014.07-rc2
Affected Firmware: CUJO Smart Firewall - Firmware version 7003

Exploitation Mechanism

To exploit, perpetrators need local access to supply the boot image.

Mitigation and Prevention

Steps to mitigate and prevent exploitation of CVE-2018-3968.

Immediate Steps to Take

Update Das U-Boot to a patched version.
Monitor and restrict local access to vulnerable systems.

Long-Term Security Practices

Implement secure boot mechanisms.
Regularly review and update firmware and software.

Patching and Updates

Apply patches provided by Das U-Boot to address the vulnerability.