Inside LogoFAIL: The UEFI Firmware Flaw Compromising Millions of Devices

In the ever-evolving landscape of cybersecurity, a new threat has emerged, casting a long shadow over the integrity of computer systems worldwide. Dubbed ‘LogoFAIL,’ this set of vulnerabilities has been unearthed within the Unified Extensible Firmware Interface (UEFI), the backbone of modern computing’s boot process. Discovered by the vigilant eyes of the Binarly Research team, LogoFAIL exposes a critical flaw in the firmware of countless devices, transcending conventional hardware boundaries to affect both x86 and ARM-based systems. This alarming revelation not only underscores the intricacies of digital security but also serves as a stark reminder of the perpetual arms race between cyber defenders and threat actors. As we delve into the depths of LogoFAIL, it becomes increasingly clear that the battleground of cybersecurity extends far beyond the visible layers of software, rooting itself in the very core of our digital infrastructure.

These vulnerabilities were discovered by the Binarly Research team and have far-reaching consequences:

  1. Discovery and Impact: LogoFAIL vulnerabilities affect various vendors’ system firmware during the device boot process, not being specific to any silicon type. They impact the entire firmware ecosystem, including Independent BIOS vendors (IBVs) like AMI, Insyde, and Phoenix. This implies that a broad range of consumer and enterprise devices could be at risk​​. Imagine a scenario where a large electronics manufacturer uses firmware from an Independent BIOS Vendor (IBV) like AMI for its laptops. If this firmware contains the vulnerable image parsing libraries identified in LogoFAIL, then all these laptops, regardless of their specific models or configurations, could potentially be at risk. This would mean millions of devices across the globe could be vulnerable to these security flaws.
  2. Operation of Vulnerabilities: These vulnerabilities enable attackers to store malicious logo images on the EFI System Partition (ESP) or in unsigned sections of a firmware update. During the boot process, when these images are parsed, the vulnerability can be triggered, allowing attackers to execute arbitrary payloads. This can lead to the bypassing of critical security features like Secure Boot and hardware-based Verified Boot mechanisms, including Intel Boot Guard, AMD Hardware-Validated Boot, or ARM TrustZone-based Secure Boot​​. For example, an attacker could craft a malicious logo image and insert it into the EFI System Partition on a victim’s laptop. When the laptop is booted, the firmware parses this image, unknowingly triggering the vulnerability. This could allow the attacker to bypass the laptop’s Secure Boot mechanism, effectively undermining one of the key security features that is supposed to ensure only trusted software is loaded during the boot process.
  3. Implications: LogoFAIL vulnerabilities can completely compromise the system’s security, making “below-the-OS” security measures like Secure Boot ineffective. This level of compromise allows attackers to gain deep control over affected systems. The vulnerabilities offer a different attack surface on the ESP partition, allowing for data-only exploitation by modifying the logo image​​.Consider a highly secure workstation used in a government facility, which relies on Secure Boot for security. If this workstation is affected by LogoFAIL, an attacker could exploit these vulnerabilities to gain control over the system even before the operating system loads. This could potentially allow the attacker to manipulate or disable other security measures, essentially gaining unrestricted access to the system and the sensitive data it contains.


Threat actors can exploit the LogoFAIL vulnerabilities in the following ways:

  1. Malicious Logo Images: Attackers can craft malicious logo images and place them on the EFI System Partition (ESP) or within unsigned sections of a firmware update. Since these images are parsed during the boot process, the malicious code within the images gets executed.
  2. Bypassing Security Mechanisms: By exploiting these vulnerabilities, attackers can bypass critical security features like Secure Boot, Intel Boot Guard, and other hardware-validated boot mechanisms. This allows them to execute unauthorized code at a fundamental level of the device.
  3. System Compromise: Once they bypass these security measures, attackers can potentially gain deep control over the system, undermining its security and potentially accessing sensitive information or installing further malware. This level of access can be particularly damaging as it occurs below the operating system level, making detection and remediation more challenging.


To mitigate the risks associated with the LogoFAIL vulnerabilities, several steps can be taken:

  1. Firmware Updates: Regularly updating firmware is crucial. Manufacturers often release patches and updates to address known vulnerabilities. Keep all devices updated with the latest firmware versions provided by the manufacturer.
  2. Vendor Communication: Stay informed about any security advisories or updates from device manufacturers. This can include checking for updates on their websites or subscribing to their security bulletins.
  3. Security Solutions: Employ security solutions that monitor firmware integrity and detect anomalies at the firmware level.
  4. Regular Audits: Conduct regular security audits of firmware to identify and mitigate potential vulnerabilities.
  5. Best Practices: Follow cybersecurity best practices, including maintaining a secure and updated environment, and educating users about the importance of security in preventing malware infections.

These steps can significantly reduce the risk of exploitation of these vulnerabilities. This research underscores the seriousness of these vulnerabilities and their potential to affect a vast range of devices, highlighting the need for comprehensive security measures in firmware development and maintenance.