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Incomplete Blacklist The advisory has been revoked - it doesn't affect any version of package grub2-signed  (opens in a new tab)

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EPSS
1.74% (75th percentile)

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  • Snyk IDSNYK-UBUNTU1404-GRUB2SIGNED-1624347
  • published16 Jun 2021
  • disclosed3 Mar 2021
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Introduced: 3 Mar 2021

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

Amendment

The Ubuntu security team deemed this advisory irrelevant for Ubuntu:14.04.

NVD Description

Note: Versions mentioned in the description apply only to the upstream grub2-signed package and not the grub2-signed package as distributed by Ubuntu.

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.