Published: 03/03/2021 Updated: 07/11/2023

CVSS v2 Base Score: 6.2 | Impact Score: 10 | Exploitability Score: 1.9

CVSS v3 Base Score: 7.5 | Impact Score: 6 | Exploitability Score: 0.8

VMScore: 552

Vector: AV:L/AC:H/Au:N/C:C/I:C/A:C

A flaw was found in grub2 in versions before 2.06, 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 executed by the kernel, defeating its Secure Boot lockdown and allowing the malicious user to load unsigned code. 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 ...

GRUB2 enables the use of the command acpi even when secure boot is signaled by the firmware An attacker with local root privileges can drop a small SSDT in /boot/efi and modify grubcfg to instruct grub to load said SSDT The SSDT then gets run by the kernel and it overwrites the kernel lockdown configuration enabling the attacker to load unsigned ...

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

oss-sec mailing list archives   By Date By Thread </form>    Multiple GRUB2 vulnerabilities   From: John Haxby <johnhaxby () oracl ...

Write-up and proof of concept exploit for CVE-2020-14372

CVE-2020-14372: Bypassing (not so) Secure Boot with one "simple trick" Vulnerability details One day I typed "help" into GRUB2's console and saw some really "fun" commands: read_byte ADDR: Read 8-bit value from ADDR write_byte ADDR VAL: Write 8-bit value VAL to ADDR I immediately thought I found the most fun Secure Boot bypass, but thes

CWE-184 https://access.redhat.com/security/vulnerabilities/RHSB-2021-003 https://bugzilla.redhat.com/show_bug.cgi?id=1873150 https://security.netapp.com/advisory/ntap-20210416-0004/https://security.gentoo.org/glsa/202104-05 https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZWZ36QK4IKU6MWDWNOOWKPH3WXZBHT2R/https://nvd.nist.gov https://github.com/kukrimate/CVE-2020-14372 https://www.debian.org/security/2021/dsa-4867 https://www.cisa.gov/uscert/ics/advisories/icsa-21-336-06

CVE-2020-14372

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