CVE-2021-3418

Name	CVE-2021-3418
Description	If certificates that signed grub are installed into db, grub can be booted directly. It will then boot any kernel without signature validation. The booted kernel will think it was booted in secureboot mode and will implement lockdown, yet it could have been tampered. This flaw is a reintroduction of CVE-2020-15705 and only affects grub2 versions prior to 2.06 and upstream and distributions using the shim_lock mechanism.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
grub2 (PTS)	buster	2.06-3~deb10u1	fixed
	buster (security)	2.06-3~deb10u4	fixed
	bullseye (security), bullseye	2.06-3~deb11u6	fixed
	bookworm, bookworm (security)	2.06-13+deb12u1	fixed
	trixie	2.12-2~deb13u1	fixed
	sid	2.12-2	fixed

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
grub2	source	(unstable)	(not affected)

- grub2 <not-affected> (Vulnerability specific to distributions using shim_lock)
https://bugzilla.redhat.com/show_bug.cgi?id=1933757