Attacker Value
Unknown
(0 users assessed)
Exploitability
Unknown
(0 users assessed)
User Interaction
None
Privileges Required
High
Attack Vector
Local
0

CVE-2021-20233

Disclosure Date: March 03, 2021 •
CVE-2021-20233 CVSS v3 Base Score: 8.2
Add MITRE ATT&CK tactics and techniques that apply to this CVE.

Description

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.

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CVSS V3 Severity and Metrics
Base Score:
8.2 High
Impact Score:
6
Exploitability Score:
1.5
Vector:
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
Attack Vector (AV):
Local
Attack Complexity (AC):
Low
Privileges Required (PR):
High
User Interaction (UI):
None
Scope (S):
Changed
Confidentiality (C):
High
Integrity (I):
High
Availability (A):
High

General Information

Offensive Application
Unknown
Utility Class
Unknown
Ports
Unknown
OS
Unknown
Vulnerable Versions
grub2 grub 2.06
Prerequisites
Unknown
Discovered By
Unknown
PoC Author
Unknown
Metasploit Module
Unknown
Reporter
Unknown

Vendors

  • fedoraproject,
  • gnu,
  • netapp,
  • redhat

Products

  • enterprise linux 7.0,
  • enterprise linux 8.0,
  • enterprise linux server aus 7.2,
  • enterprise linux server aus 7.3,
  • enterprise linux server aus 7.4,
  • enterprise linux server aus 7.6,
  • enterprise linux server aus 7.7,
  • enterprise linux server aus 8.2,
  • enterprise linux server eus 7.6,
  • enterprise linux server eus 7.7,
  • enterprise linux server eus 8.1,
  • enterprise linux server tus 7.4,
  • enterprise linux server tus 7.6,
  • enterprise linux server tus 7.7,
  • enterprise linux server tus 8.2,
  • enterprise linux workstation 7.0,
  • fedora 33,
  • fedora 34,
  • grub2,
  • ontap select deploy administration utility -
Technical Analysis