CVE-2019-5478 : Security Advisory and Response
Learn about CVE-2019-5478, a vulnerability in Zynq UltraScale+ SoC devices that allows attackers to manipulate boot image control fields, compromising secure boot behavior. Find mitigation steps and prevention measures here.
A weakness has been identified in the Encrypt Only boot mode in Zynq UltraScale+ devices, potentially allowing attackers to manipulate boot image control fields, leading to incorrect secure boot behavior.
Understanding CVE-2019-5478
This CVE involves a vulnerability in the secure boot process of Zynq UltraScale+ SoC devices.
What is CVE-2019-5478?
The vulnerability allows attackers to tamper with control fields of the boot image, causing the secure boot protocol to execute inaccurately.
The Impact of CVE-2019-5478
The exploit in the Encrypt Only boot mode of Zynq UltraScale+ devices can lead to a compromise of the secure boot process, enabling unauthorized modifications to the boot image.
Technical Details of CVE-2019-5478
This section provides detailed technical information about the vulnerability.
Vulnerability Description
An exploit in the Encrypt Only boot mode of Zynq UltraScale+ SoC devices allows attackers to manipulate boot image control fields, leading to incorrect secure boot behavior.
Affected Systems and Versions
- Affected Product: Zynq UltraScale+ SoC
- Affected Version: Not Fixed
Exploitation Mechanism
Attackers can exploit this vulnerability by manipulating the control fields of the boot image in the Encrypt Only boot mode, compromising the secure boot process.
Mitigation and Prevention
Protecting systems from CVE-2019-5478 requires immediate actions and long-term security practices.
Immediate Steps to Take
- Disable the Encrypt Only boot mode if not essential for system operation.
- Monitor for any unauthorized changes to the boot image.
- Implement strict access controls to prevent unauthorized access to boot image control fields.
Long-Term Security Practices
- Regularly update firmware and software to patch known vulnerabilities.
- Conduct security assessments and audits to identify and address potential weaknesses in the secure boot process.
Patching and Updates
- Apply patches provided by the vendor to fix the vulnerability in the affected versions of Zynq UltraScale+ SoC devices.