Grub2: bypass the grub password protection feature
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.
Impact Analysis
Refer to official advisory for detailed impact metrics.
Remediation
Ensure systems are updated to the latest vendor-supplied patch levels.
Am I Vulnerable?
Launch our assessment wizard to check if your infrastructure is exposed to • CVE-2023-4001
Credits & Attribution
The following person or organization is credited with identifying this vulnerability, as recorded in the NVD database:
- Red Hat would like to thank Maxim Suhanov for reporting this issue.
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-2023-4001
- https://bugzilla.redhat.com/show_bug.cgi?id=2224951
- https://dfir.ru/2024/01/15/cve-2023-4001-a-vulnerability-in-the-downstream-grub-boot-manager/
More from Red Hat
View All →Affected Vendor
Red Hat
View all reports →