CVE-2023-4001
Published: 15 January 2024
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.
Notes
| Author | Note |
|---|---|
| eslerm | CVE-2023-4001 has no impact Ubuntu or Secure Boot, ignoring. grub2-unsigned contains Secure Boot security fixes the grub2 package unlikely affects Ubuntu's Secure Boot grub2 and grub2-unsigned should have same major version Ubuntu Secure Boot and ESM do not cover i386 trusty's GA kernel cannot handle new versions of grub Note that key revocation is required to protect against evil housekeeper attacks (such as BlackLotus) |
Priority
Status
| Package | Release | Status |
|---|---|---|
|
grub2 Launchpad, Ubuntu, Debian |
bionic |
Not vulnerable
(does not affect Secure Boot)
|
| focal |
Not vulnerable
(does not affect Secure Boot)
|
|
| jammy |
Not vulnerable
(does not affect Secure Boot)
|
|
| lunar |
Not vulnerable
(does not affect Secure Boot)
|
|
| mantic |
Not vulnerable
(does not affect Secure Boot)
|
|
| noble |
Not vulnerable
(does not affect Secure Boot)
|
|
| trusty |
Not vulnerable
(does not affect Secure Boot)
|
|
| upstream |
Not vulnerable
(debian: Specific to a downstream patch in Red Hat)
|
|
| xenial |
Not vulnerable
(does not affect Secure Boot)
|
|
|
grub2-signed Launchpad, Ubuntu, Debian |
bionic |
Not vulnerable
(does not affect Secure Boot)
|
| focal |
Not vulnerable
(does not affect Secure Boot)
|
|
| jammy |
Not vulnerable
(does not affect Secure Boot)
|
|
| lunar |
Not vulnerable
(does not affect Secure Boot)
|
|
| mantic |
Not vulnerable
(does not affect Secure Boot)
|
|
| noble |
Not vulnerable
(does not affect Secure Boot)
|
|
| trusty |
Ignored
(update incompatible with kernel)
|
|
| upstream |
Not vulnerable
(debian: Specific to a downstream patch in Red Hat)
|
|
| xenial |
Not vulnerable
(does not affect Secure Boot)
|
|
|
grub2-unsigned Launchpad, Ubuntu, Debian |
bionic |
Not vulnerable
(does not affect Secure Boot)
|
| focal |
Not vulnerable
(does not affect Secure Boot)
|
|
| jammy |
Not vulnerable
(does not affect Secure Boot)
|
|
| lunar |
Not vulnerable
(does not affect Secure Boot)
|
|
| mantic |
Not vulnerable
(does not affect Secure Boot)
|
|
| noble |
Not vulnerable
(does not affect Secure Boot)
|
|
| trusty |
Ignored
(end of standard support)
|
|
| upstream |
Not vulnerable
(debian: Specific to a downstream patch in Red Hat)
|
|
| xenial |
Not vulnerable
(does not affect Secure Boot)
|
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 6.8 |
| Attack vector | Physical |
| Attack complexity | Low |
| Privileges required | None |
| User interaction | None |
| Scope | Unchanged |
| Confidentiality | High |
| Integrity impact | High |
| Availability impact | High |
| Vector | CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |