Use After Free Affecting grub2-efi-x64-cdboot package, versions <1:2.02-123.el8_6.8


Severity

Recommended
0.0
high
0
10

Based on CentOS security rating.

Threat Intelligence

EPSS
0.04% (12th percentile)

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  • Snyk IDSNYK-CENTOS8-GRUB2EFIX64CDBOOT-2865054
  • published9 Jun 2022
  • disclosed7 Jun 2022

Introduced: 7 Jun 2022

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

How to fix?

Upgrade Centos:8 grub2-efi-x64-cdboot to version 1:2.02-123.el8_6.8 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream grub2-efi-x64-cdboot package and not the grub2-efi-x64-cdboot package as distributed by Centos. See How to fix? for Centos:8 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 Scores

version 3.1