Out-of-bounds Write Affecting grub2-tools-minimal package, versions <1:2.02-0.87.el7_9.2


Severity

Recommended
medium

Based on CentOS security rating.

Threat Intelligence

EPSS
0.04% (5th percentile)

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  • Snyk IDSNYK-CENTOS7-GRUB2TOOLSMINIMAL-2183857
  • published26 Jul 2021
  • disclosed2 Mar 2021

Introduced: 2 Mar 2021

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

How to fix?

Upgrade Centos:7 grub2-tools-minimal 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-tools-minimal package and not the grub2-tools-minimal 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. 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