Incomplete Blacklist Affecting grub2-common package, versions <1:2.06-2.amzn2.0.1


Severity

Recommended
medium

Based on Amazon Linux security rating.

Threat Intelligence

EPSS
0.05% (16th percentile)

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  • Snyk IDSNYK-AMZN2-GRUB2COMMON-1701972
  • published27 Sept 2021
  • disclosed3 Mar 2021

Introduced: 3 Mar 2021

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

How to fix?

Upgrade Amazon-Linux:2 grub2-common to version 1:2.06-2.amzn2.0.1 or higher.
This issue was patched in ALAS2-2021-1684.

NVD Description

Note: Versions mentioned in the description apply only to the upstream grub2-common package and not the grub2-common package as distributed by Amazon-Linux. See How to fix? for Amazon-Linux:2 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