Out-of-bounds Write Affecting grub2 package, versions [,2.06)


Severity

Recommended
0.0
high
0
10

CVSS assessment made by Snyk's Security Team. Learn more

Threat Intelligence

EPSS
0.04% (6th percentile)

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  • Snyk IDSNYK-UNMANAGED-GRUB2-2368575
  • published26 Jan 2022
  • disclosed3 Mar 2021
  • creditUnknown

Introduced: 3 Mar 2021

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

How to fix?

Upgrade grub2 to version 2.06 or higher.

Overview

Affected versions of this package are vulnerable to Out-of-bounds Write. 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