The Binarly paper points to someone using the LogoFAIL bug to configure a UEFI payload that bypasses secure boot (firmware) by tricking the firmware into accepting their self-signed key (which is then stored in the firmware as the MOK variable). This method allows malicious code to install without user interaction, effectively slipping a backdoor into the Linux kernel before security defenses are activated.
Normally, Secure Boot prevents the UEFI from running all subsequent files unless they bear a digital signature certifying those files are trusted by the device maker. However, this exploit injects shell code via a malicious bitmap image displayed during boot, allowing the UEFI to treat backdoored kernel images and GRUB files as trusted components.
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