// For flags

CVE-2023-4001

Grub2: bypass the grub password protection feature

Severity Score

6.8
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

Track*
*SSVC
Descriptions

An authentication bypass flaw was found in GRUB due to the way that GRUB uses the UUID of a device to search for the configuration file that contains the password hash for the GRUB password protection feature. An attacker capable of attaching an external drive such as a USB stick containing a file system with a duplicate UUID (the same as in the "/boot/" file system) can bypass the GRUB password protection feature on UEFI systems, which enumerate removable drives before non-removable ones. This issue was introduced in a downstream patch in Red Hat's version of grub2 and does not affect the upstream package.

Se encontró un fallo de omisión de autenticación en GRUB debido a la forma en que GRUB usa el UUID de un dispositivo para buscar el archivo de configuración que contiene el hash de contraseña para la función de protección de contraseña de GRUB. Un atacante capaz de conectar una unidad externa, como una memoria USB que contenga un sistema de archivos con un UUID duplicado (el mismo que en el sistema de archivos "/boot/") puede omitir la función de protección con contraseña GRUB en los sistemas UEFI, que enumeran unidades extraíbles. antes que los no removibles. Este problema se introdujo en un parche posterior en la versión de grub2 de Red Hat y no afecta el paquete anterior.

*Credits: Red Hat would like to thank Maxim Suhanov for reporting this issue.
CVSS Scores
Attack Vector
Physical
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
* Common Vulnerability Scoring System
SSVC
  • Decision:Track*
Exploitation
None
Automatable
No
Tech. Impact
Total
* Organization's Worst-case Scenario
Timeline
  • 2023-07-28 CVE Reserved
  • 2024-01-15 CVE Published
  • 2024-09-17 EPSS Updated
  • 2024-11-13 CVE Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-290: Authentication Bypass by Spoofing
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Gnu
Search vendor "Gnu"
Grub2
Search vendor "Gnu" for product "Grub2"
--
Affected
Redhat
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Enterprise Linux
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9.0
Search vendor "Redhat" for product "Enterprise Linux" and version "9.0"
-
Affected
Fedoraproject
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Fedora
Search vendor "Fedoraproject" for product "Fedora"
38
Search vendor "Fedoraproject" for product "Fedora" and version "38"
-
Affected
Fedoraproject
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Fedora
Search vendor "Fedoraproject" for product "Fedora"
39
Search vendor "Fedoraproject" for product "Fedora" and version "39"
-
Affected