Use After Free Affecting grub2-efi-aa64 package, versions <1:2.02-87.el8_2.3


Severity

Recommended
medium

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.04% (6th percentile)

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  • Snyk IDSNYK-RHEL8-GRUB2EFIAA64-3893863
  • published26 Jul 2021
  • disclosed2 Mar 2021

Introduced: 2 Mar 2021

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

How to fix?

Upgrade RHEL:8 grub2-efi-aa64 to version 1:2.02-87.el8_2.3 or higher.
This issue was patched in RHSA-2021:0697.

NVD Description

Note: Versions mentioned in the description apply only to the upstream grub2-efi-aa64 package and not the grub2-efi-aa64 package as distributed by RHEL. See How to fix? for RHEL: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 Scores

version 3.1