Vulnerability in GNU Grub2
CVE-2023-4001
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.
EPSS: 0.005 (43.5th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 6.8 (Medium). Vector: CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Gnu Grub2
- Fedoraproject Fedora — versions 38, 39
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9 — versions 1:2.06-70.el9_3.2
- Red Hat Enterprise Linux 9.0 Extended Update Support — versions 1:2.06-27.el9_0.16
- Red Hat Enterprise Linux 9.2 Extended Update Support — versions 1:2.06-61.el9_2.2
- Redhat Enterprise_linux — versions 9.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- secalert@redhat.com (x_refsource_REDHAT, vendor-advisory)
- secalert@redhat.com (x_refsource_REDHAT, vendor-advisory)
- secalert@redhat.com (x_refsource_REDHAT, vendor-advisory)
- secalert@redhat.com (x_refsource_REDHAT, Third Party Advisory, vdb-entry)
- secalert@redhat.com (x_refsource_REDHAT, issue-tracking, Issue Tracking, Vendor Advisory)
- secalert@redhat.com (Third Party Advisory)
- af854a3a-2127-422b-91ae-364da2661108
- af854a3a-2127-422b-91ae-364da2661108
- af854a3a-2127-422b-91ae-364da2661108
- af854a3a-2127-422b-91ae-364da2661108
Frequently asked questions
- What is CVE-2023-4001?
- CVE-2023-4001 is a medium-severity vulnerability in GNU Grub2, classified under Authentication Bypass by Spoofing. CVSS score: 6.8/10. Published 2024-01-15.
- How severe is CVE-2023-4001?
- Medium severity. CVSS v3 base score is 6.8 out of 10.
- Is CVE-2023-4001 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.