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CVE-2022-3775

Published: 19 December 2022

When rendering certain unicode sequences, grub2's font code doesn't proper validate if the informed glyph's width and height is constrained within bitmap size. As consequence an attacker can craft an input which will lead to a out-of-bounds write into grub2's heap, leading to memory corruption and availability issues. Although complex, arbitrary code execution could not be discarded.

Priority

Medium

Cvss 3 Severity Score

7.1

Score breakdown

Status

Package Release Status
grub2-unsigned
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Needs triage

bionic Pending
(2.06-2ubuntu14)
focal Pending
(2.06-2ubuntu14)
jammy Pending
(2.06-2ubuntu14)
kinetic Ignored
(end of life)
lunar
Released (2.06-2ubuntu15)
upstream Needs triage

grub2-signed
Launchpad, Ubuntu, Debian
trusty Needs triage

xenial Needs triage

bionic Pending
(1.187.3~18.04.1)
focal Pending
(1.187.3~20.04.1)
jammy Pending
(1.187.3~22.04.1)
kinetic Ignored
(end of life)
lunar Not vulnerable
(1.192)
upstream Needs triage

grub2
Launchpad, Ubuntu, Debian
kinetic Ignored
(end of life, was needed)
jammy Needed

trusty Needs triage

xenial Needs triage

upstream
Released (2.06-5)
bionic Needed

focal Needed

lunar
Released (2.06-2ubuntu14)

Severity score breakdown

Parameter Value
Base score 7.1
Attack vector Local
Attack complexity Low
Privileges required Low
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact High
Availability impact High
Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H