BootHole
BootHole is a Secure Boot bypass and bootloader exploitation threat associated with flaws in GRUB. The provided content states that BootHole vulnerabilities in GRUB allowed arbitrary code execution via malformed configuration files and, on older hardware, could overwhelm DBX memory. It is referenced alongside other bootkit and firmware-level threats such as PKFail and BlackLotus in UEFI Secure Boot guidance from NSA and CISA/NSA. The content characterizes BootHole as relevant to persistent firmware or boot-level malware risk when Secure Boot is outdated, misconfigured, disabled, or using incomplete DBX revocation lists. It affects systems relying on UEFI Secure Boot and GRUB-based boot chains, with enterprise environments specifically discussed as exposed when Secure Boot variables and revocation databases are not properly managed. No specific threat actor, industry targeting, or concrete IOC values are provided in the content.
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BootHole is a vulnerability in the GRUB bootloader that allows arbitrary code execution during boot by exploiting malformed configuration files, potentially bypassing Secure Boot protections.
BootHole is a vulnerability and associated malware technique that exploits flaws in bootloaders to bypass UEFI Secure Boot, enabling attackers to install persistent malware at the firmware level.
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