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

CVE-2023-4001

Disclosure Date: January 15, 2024 •
CVE-2023-4001 CVSS v3 Base Score: 6.8
Add MITRE ATT&CK tactics and techniques that apply to this CVE.

Description

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.

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CVSS V3 Severity and Metrics
Base Score:
6.8 Medium
Impact Score:
5.9
Exploitability Score:
0.9
Vector:
CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector (AV):
Physical
Attack Complexity (AC):
Low
Privileges Required (PR):
None
User Interaction (UI):
None
Scope (S):
Unchanged
Confidentiality (C):
High
Integrity (I):
High
Availability (A):
High

General Information

Offensive Application
Unknown
Utility Class
Unknown
Ports
Unknown
OS
Unknown
Vulnerable Versions
Red Hat Enterprise Linux 9 not down converted
Red Hat Enterprise Linux 9.0 Extended Update Support not down converted
Red Hat Enterprise Linux 9.2 Extended Update Support not down converted
Red Hat Enterprise Linux 8 not down converted
Prerequisites
Unknown
Discovered By
Unknown
PoC Author
Unknown
Metasploit Module
Unknown
Reporter
Unknown

Vendors

  • fedoraproject,
  • gnu,
  • redhat

Products

  • enterprise linux 9.0,
  • fedora 38,
  • fedora 39,
  • grub2 -
Technical Analysis