CVE-2023-4001: Grub2: bypass the grub password protection feature
First published: Mon Jul 24 2023(Updated: )
<a class="bz_bug_link bz_secure " title="" href="show_bug.cgi?id=2223437">https://bugzilla.redhat.com/show_bug.cgi?id=2223437</a> The "/boot/efi/EFI/fedora/grub.cfg" configuration file allows an unprivileged user with physical access to a computer to bypass the GRUB password protection feature on many (but not all) UEFI-based systems.
Credit: secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| CentOS Grub2-pc-modules | ||
| Red Hat Enterprise Linux | =9.0 | |
| Fedora | =38 | |
| Fedora | =39 |
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Reference Links
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2223437
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2258096
- https://access.redhat.com/errata/RHSA-2024:0437
- https://access.redhat.com/errata/RHSA-2024:0468
- https://access.redhat.com/errata/RHSA-2024:0456
- https://bugzilla.redhat.com/show_bug.cgi?id=2224951
- https://access.redhat.com/security/cve/CVE-2023-4001
- https://dfir.ru/2024/01/15/cve-2023-4001-a-vulnerability-in-the-downstream-grub-boot-manager/
Frequently Asked Questions
What is the impact of CVE-2023-4001?
CVE-2023-4001 allows an unprivileged user with physical access to bypass the GRUB password protection.
What versions are affected by CVE-2023-4001?
CVE-2023-4001 affects GRUB2 and specific versions of Red Hat Enterprise Linux 9.0, Fedora 38, and Fedora 39.
How can I mitigate CVE-2023-4001?
To mitigate CVE-2023-4001, restrict physical access to servers and update your GRUB configuration file to strengthen security.
Is CVE-2023-4001 easy to exploit?
Yes, CVE-2023-4001 is considered easy to exploit because it requires only physical access to the machine.
Are there any updates available for CVE-2023-4001?
Yes, patches and updates addressing CVE-2023-4001 have been released and should be applied promptly.
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