Use After Free Affecting shim-ia32 package, versions <0:15.4-2.el8_1.alma


Severity

Recommended
medium

Based on AlmaLinux security rating.

Threat Intelligence

EPSS
1.15% (63rd percentile)

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  • Snyk IDSNYK-ALMALINUX8-SHIMIA32-5636222
  • published28 May 2023
  • disclosed18 May 2021

Introduced: 18 May 2021

CVE-2020-25632  (opens in a new tab)
CWE-416  (opens in a new tab)

How to fix?

Upgrade AlmaLinux:8 shim-ia32 to version 0:15.4-2.el8_1.alma or higher.
This issue was patched in ALSA-2021:1734.

NVD Description

Note: Versions mentioned in the description apply only to the upstream shim-ia32 package and not the shim-ia32 package as distributed by AlmaLinux. See How to fix? for AlmaLinux:8 relevant fixed versions and status.

A flaw was found in grub2 in versions prior to 2.06. The rmmod implementation allows the unloading of a module used as a dependency without checking if any other dependent module is still loaded leading to a use-after-free scenario. This could allow arbitrary code to be executed or a bypass of Secure Boot protections. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

CVSS Base Scores

version 3.1