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Out-of-bounds Write The advisory has been revoked - it doesn't affect any version of package grub2-signed  (opens in a new tab)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
0.61% (46th percentile)

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  • Snyk IDSNYK-UBUNTU1404-GRUB2SIGNED-1627019
  • published16 Jun 2021
  • disclosed3 Mar 2021
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Introduced: 3 Mar 2021

CVE-2021-20233  (opens in a new tab)
CWE-787  (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. Setparam_prefix() in the menu rendering code performs a length calculation on the assumption that expressing a quoted single quote will require 3 characters, while it actually requires 4 characters which allows an attacker to corrupt memory by one byte for each quote in the input. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.