Out-of-bounds Write Affecting grub2 package, versions <2.04-16


Severity

Recommended
0.0
high
0
10

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Threat Intelligence

EPSS
0.04% (5th percentile)

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  • Snyk IDSNYK-DEBIAN11-GRUB2-1081406
  • published3 Mar 2021
  • disclosed3 Mar 2021

Introduced: 3 Mar 2021

CVE-2021-20233  (opens in a new tab)
CWE-787  (opens in a new tab)

How to fix?

Upgrade Debian:11 grub2 to version 2.04-16 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream grub2 package and not the grub2 package as distributed by Debian. See How to fix? for Debian:11 relevant fixed versions and status.

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.

CVSS Scores

version 3.1