CVE-2021-3697

NameCVE-2021-3697
DescriptionA crafted JPEG image may lead the JPEG reader to underflow its data pointer, allowing user-controlled data to be written in heap. To a successful to be performed the attacker needs to perform some triage over the heap layout and craft an image with a malicious format and payload. This vulnerability can lead to data corruption and eventual code execution or secure boot circumvention. This flaw affects grub2 versions prior grub-2.12.
SourceCVE (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 PackageReleaseVersionStatus
grub2 (PTS)jessie, jessie (lts)2.02~beta2-22+deb8u2vulnerable
stretch (lts), stretch2.02~beta3-5+deb9u3vulnerable
buster (security), buster, buster (lts)2.06-3~deb10u4fixed
bullseye (security), bullseye2.06-3~deb11u6fixed
bookworm (security), bookworm2.06-13+deb12u1fixed
sid, trixie2.12-5fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
grub2sourcebuster2.06-3~deb10u1
grub2sourcebullseye2.06-3~deb11u1
grub2source(unstable)2.06-3

Notes

[stretch] - grub2 <ignored> (No SecureBoot support in stretch)
[jessie] - grub2 <ignored> (No SecureBoot support in jessie)
https://www.openwall.com/lists/oss-security/2022/06/07/5

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