Incomplete Blacklist Affecting grub2-efi-x64 package, versions <1:2.02-0.87.el7_9.2


Severity

Recommended
medium

Based on CentOS security rating.

Threat Intelligence

EPSS
0.05% (16th percentile)

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  • Snyk IDSNYK-CENTOS7-GRUB2EFIX64-2181236
  • published26 Jul 2021
  • disclosed2 Mar 2021

Introduced: 2 Mar 2021

CVE-2020-14372  (opens in a new tab)
CWE-184  (opens in a new tab)

How to fix?

Upgrade Centos:7 grub2-efi-x64 to version 1:2.02-0.87.el7_9.2 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream grub2-efi-x64 package and not the grub2-efi-x64 package as distributed by Centos. See How to fix? for Centos:7 relevant fixed versions and status.

A flaw was found in grub2 in versions prior to 2.06, where it incorrectly enables the usage of the ACPI command when Secure Boot is enabled. This flaw allows an attacker with privileged access to craft a Secondary System Description Table (SSDT) containing code to overwrite the Linux kernel lockdown variable content directly into memory. The table is further loaded and executed by the kernel, defeating its Secure Boot lockdown and allowing the attacker to load unsigned code. The highest threat from this vulnerability is to data confidentiality and integrity, as well as system availability.

CVSS Scores

version 3.1