Published: 03/03/2021 Updated: 21/11/2024

A flaw was found in grub2 in versions before 2.06. The rmmod implementation allows the unloading of a module used as a dependency without checking if any other dependent module is still loaded leading to a use-after-free scenario. This could allow arbitrary code to be executed or a bypass of Secure Boot protections. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

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Several vulnerabilities have been discovered in the GRUB2 bootloader CVE-2020-14372 It was discovered that the acpi command allows a privileged user to load crafted ACPI tables when Secure Boot is enabled CVE-2020-25632 A use-after-free vulnerability was found in the rmmod command CVE-2020-25647 An out-of-bound write vulnerabili ...

A flaw was found in GRUB 2, where it incorrectly enables the usage of the ACPI command when Secure Boot is enabled This flaw allows an attacker with privileged access to craft a Secondary System Description Table (SSDT) containing code to overwrite the Linux kernel lockdown variable content directly into memory The table is further loaded and exe ...

A flaw was found in grub2 The rmmod implementation allows the unloading of a module used as a dependency without checking if any other dependent module is still loaded leading to a use-after-free scenario This could allow arbitrary code to be executed or a bypass of Secure Boot protections The highest threat from this vulnerability is to data co ...

The rmmod implementation for grub2 is flawed, allowing an attacker to unload a module used as a dependency without checking if any other dependent module is still loaded This leads to a use-after-free scenario possibly allowing an attacker to execute arbitrary code and by-pass Secure Boot protections ...

HP has been informed of a potential security vulnerability in GRUB2 bootloaders commonly used by Linux This vulnerability, known as “There’s a Hole in the Boot” (also nicknamed “BootHole”), could allow bypass of UEFI Secure Boot and allow arbitrary code execution Additional GRUB2 vulnerabilities found in response to the initial report ...

Critical Infrastructure Sectors: Energy

On 2021-02-23 we notified the distros list about multiple grub vulnerabilities This is the formal announcement sent to grub-devel which explains in a little more detail what has been done jch [snip] ...

This script will remediate the BootHole bug identified in CVE-2020-25632 and/or CVE-2021-20233.

Boot Hole Fix This script will remediate the BootHole bug identified in CVE-2020-25632 and/or CVE-2021-20233 On July 29, 2020, Microsoft published security advisory 200011 that describes a new vulnerability that's related to Secure Boot Devices that trust the Microsoft third-party Unified Extensible Firmware Interface (UEFI) Certificate Authority (CA) in their Secure Boo

https://nvd.nist.gov https://www.debian.org/security/2021/dsa-4867 https://github.com/pauljrowland/BootHoleFix https://www.cisa.gov/uscert/ics/advisories/icsa-21-336-06

CVE-2020-25632

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