CVE-2023-4001

Summary

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 & exploitability

CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products we track (2)

Recommendation

Apply the vendor fix in your normal patch cycle. Open any affected product above for its exact safe version.

Additional information

• NVD record
• https://bugzilla.redhat.com/show_bug.cgi?id=2224951Advisory
• 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-2023-4001Advisory
• https://dfir.ru/2024/01/15/cve-2023-4001-a-vulnerability-in-the-downstream-grub-boot-manager/Advisory
• http://www.openwall.com/lists/oss-security/2024/01/15/3