CVE-2021-3418

NameCVE-2021-3418
DescriptionIf 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.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)
NVD severitymedium

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
grub2 (PTS)stretch2.02~beta3-5+deb9u2fixed
buster, buster (security)2.02+dfsg1-20+deb10u4fixed
bullseye2.04-17fixed
sid2.04-18fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
grub2source(unstable)(not affected)

Notes

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

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