PT-2020-6588 · Grub2+10 · Grub2+10
Marco Benatto
+1
·
Published
2020-08-27
·
Updated
2025-08-13
·
CVE-2020-14372
CVSS v3.1
7.5
High
| Vector | AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H |
Name of the Vulnerable Software and Affected Versions
grub2 versions prior to 2.06
Description
A flaw was found in grub2 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 attacker to load unsigned code. The highest threat from this vulnerability is to data confidentiality and integrity, as well as system availability.
Recommendations
For versions prior to 2.06, update to version 2.06 or later to resolve the issue. As a temporary workaround, consider disabling the usage of ACPI commands when Secure Boot is enabled until a patch is available. Restrict access to the SSDT table to minimize the risk of exploitation. Avoid using the
ACPI command in the grub2 configuration file until the issue is resolved.Exploit
Fix
Incomplete List of Disallowed Inputs
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Weakness Enumeration
Related Identifiers
Affected Products
Alt Linux
Almalinux
Astra Linux
Centos
Linuxmint
Red Hat
Red Os
Rocky Linux
Suse
Ubuntu
Grub2