CVE-2024-2312

2024-04-0500:00:00

ubuntu.com

grub2

uefi

system table

use-after-free

secure boot

bypass

bug

ubuntu

debian

peimage

6.7 Medium

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

HIGH

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

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

0.0004 Low

EPSS

Percentile

15.5%

JSON

GRUB2 does not call the module fini functions on exit, leading to
Debian/Ubuntu’s peimage GRUB2 module leaving UEFI system table hooks after
exit. This lead to a use-after-free condition, and could possibly lead to
secure boot bypass.

Bugs

<https://bugs.launchpad.net/ubuntu/+source/grub2-unsigned/+bug/2054127>

Notes

Author	Note
eslerm	the grub2 package does not affect Ubuntu’s Secure Boot grub2-unsigned contains Secure Boot security fixes 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)
mdeslaur	this is fixed in grub2-unsigned (2.12~rc1-10ubuntu4.2) and grub2-signed (1.197.2) in mantic-proposed.

OSVersionArchitecturePackageVersionFilename
ubuntu23.10noarchgrub2-signed< anyUNKNOWN
ubuntu24.04noarchgrub2-signed< 1.202UNKNOWN
ubuntu23.10noarchgrub2-unsigned< anyUNKNOWN
ubuntu24.04noarchgrub2-unsigned< 2.12-1ubuntu7UNKNOWN

OS	Version	Architecture	Package	Version	Filename
ubuntu	23.10	noarch	grub2-signed	< any	UNKNOWN
ubuntu	24.04	noarch	grub2-signed	< 1.202	UNKNOWN
ubuntu	23.10	noarch	grub2-unsigned	< any	UNKNOWN
ubuntu	24.04	noarch	grub2-unsigned	< 2.12-1ubuntu7	UNKNOWN