| 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, 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) | 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 | 2.06-3~deb10u1 | | | |
| grub2 | source | bullseye | 2.06-3~deb11u1 | | | |
| grub2 | source | (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