Vulnerability 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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Gnu | Grub2 | - |
| Redhat | Enterprise Linux | 9.0 |
| Fedoraproject | Fedora | 38 |
Related Weaknesses (CWE)
References
- https://access.redhat.com/errata/RHSA-2024:0437
- https://access.redhat.com/errata/RHSA-2024:0456
- https://access.redhat.com/errata/RHSA-2024:0468
- https://access.redhat.com/security/cve/CVE-2023-4001Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2224951Issue TrackingVendor Advisory
- https://dfir.ru/2024/01/15/cve-2023-4001-a-vulnerability-in-the-downstream-grub-Third Party Advisory
- http://www.openwall.com/lists/oss-security/2024/01/15/3
- https://access.redhat.com/errata/RHSA-2024:0437
- https://access.redhat.com/errata/RHSA-2024:0456
- https://access.redhat.com/errata/RHSA-2024:0468
- https://access.redhat.com/security/cve/CVE-2023-4001Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2224951Issue TrackingVendor Advisory
- https://dfir.ru/2024/01/15/cve-2023-4001-a-vulnerability-in-the-downstream-grub-Third Party Advisory
- https://lists.fedoraproject.org/archives/list/[email protected]
- https://lists.fedoraproject.org/archives/list/[email protected]
FAQ
What is CVE-2023-4001?
CVE-2023-4001 is a vulnerability with a CVSS score of 6.8 (MEDIUM). 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...
How severe is CVE-2023-4001?
CVE-2023-4001 has been rated MEDIUM with a CVSS base score of 6.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2023-4001?
Check the references section above for vendor advisories and patch information. Affected products include: Gnu Grub2, Redhat Enterprise Linux, Fedoraproject Fedora.