CVE-2021-3696 (original) (raw)

Name	CVE-2021-3696
Description	A heap out-of-bounds write may heppen during the handling of Huffman tables in the PNG reader. This may lead to data corruption in the heap space. Confidentiality, Integrity and Availablity impact may be considered Low as it's very complex to an attacker control the encoding and positioning of corrupted Huffman entries to achieve results such as arbitrary code execution and/or secure boot circumvention. This flaw affects grub2 versions prior grub-2.12.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Name

CVE-2021-3696

Description

A heap out-of-bounds write may heppen during the handling of Huffman tables in the PNG reader. This may lead to data corruption in the heap space. Confidentiality, Integrity and Availablity impact may be considered Low as it's very complex to an attacker control the encoding and positioning of corrupted Huffman entries to achieve results such as arbitrary code execution and/or secure boot circumvention. This flaw affects grub2 versions prior grub-2.12.

Source

CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, 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)	bullseye (security), bullseye	2.06-3~deb11u6	fixed
bookworm	2.06-13+deb12u2	fixed
bookworm (security)	2.06-13+deb12u1	fixed
trixie	2.12-9+deb13u2	fixed
forky, sid	2.14-2	fixed

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

Package	Type	Release	Fixed Version
grub2	source	buster	2.06-3~deb10u1
grub2	source	bullseye	2.06-3~deb11u1
grub2	source	(unstable)	2.06-3

Notes

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