Ubuntu.comUB:CVE-2023-4692CVE-2023-4692
7.8 High
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8 High
AI Score
Confidence
High
0.0004 Low
EPSS
Percentile
5.1%
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.
Notes
| Author | Note |
|---|---|
| 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 |
| OS | Version | Architecture | Package | Version | Filename |
|---|---|---|---|---|---|
| ubuntu | 18.04 | noarch | grub2-signed | < any | UNKNOWN |
| ubuntu | 20.04 | noarch | grub2-signed | < 1.187.6~20.04.1 | UNKNOWN |
| ubuntu | 22.04 | noarch | grub2-signed | < 1.187.6 | UNKNOWN |
| ubuntu | 23.04 | noarch | grub2-signed | < 1.193.2 | UNKNOWN |
| ubuntu | 23.10 | noarch | grub2-signed | < 1.197 | UNKNOWN |
| ubuntu | 24.04 | noarch | grub2-signed | < 1.197 | UNKNOWN |
| ubuntu | 16.04 | noarch | grub2-signed | < any | UNKNOWN |
| ubuntu | 18.04 | noarch | grub2-unsigned | < any | UNKNOWN |
| ubuntu | 20.04 | noarch | grub2-unsigned | < 2.06-2ubuntu14.4 | UNKNOWN |
| ubuntu | 22.04 | noarch | grub2-unsigned | < 2.06-2ubuntu14.4 | UNKNOWN |
Related
7.8 High
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8 High
AI Score
Confidence
High
0.0004 Low
EPSS
Percentile
5.1%