CVE-2023-4692
Publication date 3 October 2023
Last updated 24 July 2024
Ubuntu priority
Cvss 3 Severity Score
An out-of-bounds write flaw was found in grub2's NTFS filesystem driver. This issue may allow an attacker to present a specially crafted NTFS filesystem image, leading to grub's heap metadata corruption. In some circumstances, the attack may also corrupt the UEFI firmware heap metadata. As a result, arbitrary code execution and secure boot protection bypass may be achieved.
From the Ubuntu Security Team
It was discovered that a specially crafted file system image could cause a heap-based out-of-bounds write. An attacker could potentially use this to perform arbitrary code execution bypass and bypass secure boot protections.
Status
Package | Ubuntu Release | Status |
---|---|---|
grub2 | 24.10 oracular |
Not affected
|
24.04 LTS noble |
Not affected
|
|
22.04 LTS jammy |
Not affected
|
|
20.04 LTS focal |
Not affected
|
|
18.04 LTS bionic |
Not affected
|
|
16.04 LTS xenial |
Not affected
|
|
14.04 LTS trusty |
Not affected
|
|
grub2-signed | 24.10 oracular |
Fixed 1.197
|
24.04 LTS noble |
Fixed 1.197
|
|
22.04 LTS jammy |
Fixed 1.187.6
|
|
20.04 LTS focal |
Fixed 1.187.6~20.04.1
|
|
18.04 LTS bionic |
Needs evaluation
|
|
16.04 LTS xenial |
Needs evaluation
|
|
14.04 LTS trusty | Ignored end of ESM support, was ignored [update incompatible with kernel] | |
grub2-unsigned | 24.10 oracular |
Fixed 2.12~rc1-10ubuntu4
|
24.04 LTS noble |
Fixed 2.12~rc1-10ubuntu4
|
|
22.04 LTS jammy |
Fixed 2.06-2ubuntu14.4
|
|
20.04 LTS focal |
Fixed 2.06-2ubuntu14.4
|
|
18.04 LTS bionic |
Needs evaluation
|
|
16.04 LTS xenial |
Needs evaluation
|
|
14.04 LTS trusty | Ignored end of standard support |
Notes
eslerm
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
eslerm
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)
eslerm
CWE-122
Severity score breakdown
Parameter | Value |
---|---|
Base score | 7.8 · High |
Attack vector | Local |
Attack complexity | Low |
Privileges required | Low |
User interaction | None |
Scope | Unchanged |
Confidentiality | High |
Integrity impact | High |
Availability impact | High |
Vector | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
References
Related Ubuntu Security Notices (USN)
- USN-6410-1
- GRUB2 vulnerabilities
- 4 October 2023