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

CVSS v2 Base Score: 7.2 | Impact Score: 10 | Exploitability Score: 3.9

CVSS v3 Base Score: 8.2 | Impact Score: 6 | Exploitability Score: 1.5

VMScore: 641

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

A flaw was found in grub2 in versions before 2.06. Setparam_prefix() in the menu rendering code performs a length calculation on the assumption that expressing a quoted single quote will require 3 characters, while it actually requires 4 characters which allows an malicious user to corrupt memory by one byte for each quote in the input. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

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gnu grub2
redhat enterprise linux server aus 7.2
redhat enterprise linux workstation 7.0
redhat enterprise linux 7.0
redhat enterprise linux server aus 7.3
redhat enterprise linux server aus 7.4
redhat enterprise linux server tus 7.4
redhat enterprise linux server tus 7.6
redhat enterprise linux server eus 7.6
redhat enterprise linux server aus 7.6
redhat enterprise linux 8.0
redhat enterprise linux server eus 7.7
redhat enterprise linux server aus 7.7
redhat enterprise linux server tus 7.7
redhat enterprise linux server eus 8.1
redhat enterprise linux server tus 8.2
redhat enterprise linux server aus 8.2
fedoraproject fedora 33
fedoraproject fedora 34
netapp ontap select deploy administration utility -

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 Setparam_prefix() in the menu rendering code performs a length calculation on the assumption that expressing a quoted single quote will require 3 characters, while it actually requires 4 characters which allows an attacker to corrupt memory by one byte for each quote in the input The highest threat from this vulnerabilit ...

There's a flaw in GRUB2 menu rendering code setparam_prefix() in the menu rendering code It performs a length calculation under the assumption that expressing a quoted single quote will require 3 characters, while it actually requires 4 characters This allow an attacker to corrupt memory by one byte for each quote in the input ...

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

CWE-787 https://bugzilla.redhat.com/show_bug.cgi?id=1926263 https://security.gentoo.org/glsa/202104-05 https://security.netapp.com/advisory/ntap-20220325-0001/https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZWZ36QK4IKU6MWDWNOOWKPH3WXZBHT2R/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-2021-20233

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