Use After Free Affecting grub2-tools-minimal package, versions <1:2.06-27.el9_0.7.alma


Severity

Recommended
0.0
high
0
10

Based on AlmaLinux security rating.

Threat Intelligence

EPSS
0.05% (19th percentile)

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  • Snyk IDSNYK-ALMALINUX9-GRUB2TOOLSMINIMAL-5658954
  • published28 May 2023
  • disclosed16 Jun 2022

Introduced: 16 Jun 2022

CVE-2022-28736  (opens in a new tab)
CWE-416  (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.

There's a use-after-free vulnerability in grub_cmd_chainloader() function; The chainloader command is used to boot up operating systems that doesn't support multiboot and do not have direct support from GRUB2. When executing chainloader more than once a use-after-free vulnerability is triggered. If an attacker can control the GRUB2's memory allocation pattern sensitive data may be exposed and arbitrary code execution can be achieved.

CVSS Base Scores

version 3.1