CVE-2020-14372

Name	CVE-2020-14372
Description	A flaw was found in grub2 in versions prior to 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 attacker to load unsigned code. The highest threat from this vulnerability is to data confidentiality and integrity, as well as system availability.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
References	DSA-4867-1

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
grub2 (PTS)	jessie, jessie (lts)	2.02~beta2-22+deb8u2	vulnerable
	stretch (lts), stretch	2.02~beta3-5+deb9u3	vulnerable
	buster (security), buster, buster (lts)	2.06-3~deb10u4	fixed
	bullseye (security), bullseye	2.06-3~deb11u6	fixed
	bookworm (security), bookworm	2.06-13+deb12u1	fixed
	sid, trixie	2.12-5	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
grub2	source	buster	2.02+dfsg1-20+deb10u4		DSA-4867-1
grub2	source	(unstable)	2.04-16

[stretch] - grub2 <ignored> (No SecureBoot support in stretch)
[jessie] - grub2 <ignored> (No SecureBoot support in jessie)