Out-of-bounds Write Affecting grub2-pc-modules package, versions <1:2.06-46.el9_1.3


Severity

Recommended
medium

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.04% (15th percentile)

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  • Snyk IDSNYK-RHEL9-GRUB2PCMODULES-3121211
  • published16 Nov 2022
  • disclosed15 Nov 2022

Introduced: 15 Nov 2022

CVE-2022-3775  (opens in a new tab)
CWE-787  (opens in a new tab)

How to fix?

Upgrade RHEL:9 grub2-pc-modules to version 1:2.06-46.el9_1.3 or higher.
This issue was patched in RHSA-2023:0752.

NVD Description

Note: Versions mentioned in the description apply only to the upstream grub2-pc-modules package and not the grub2-pc-modules package as distributed by RHEL. See How to fix? for RHEL:9 relevant fixed versions and status.

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.

CVSS Scores

version 3.1