Out-of-bounds Write Affecting grub2-tools-minimal package, versions <1:2.06-27.el9_0.7.alma


Severity

Recommended
high

Based on AlmaLinux security rating.

Threat Intelligence

EPSS
0.05% (21st percentile)

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  • Snyk IDSNYK-ALMALINUX9-GRUB2TOOLSMINIMAL-5658864
  • published28 May 2023
  • disclosed16 Jun 2022

Introduced: 16 Jun 2022

CVE-2021-3696  (opens in a new tab)
CWE-787  (opens in a new tab)

How to fix?

Upgrade AlmaLinux:9 grub2-tools-minimal to version 1:2.06-27.el9_0.7.alma or higher.
This issue was patched in ALSA-2022:5099.

NVD Description

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

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.

CVSS Base Scores

version 3.1