CVE-2023-4692

Grub2: out-of-bounds write at fs/ntfs.c may lead to unsigned code execution

Severity Score

7.8

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

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.

Se encontró una falla de escritura fuera de los límites en el controlador del sistema de archivos NTFS de grub2. Este problema puede permitir que un atacante presente una imagen del sistema de archivos NTFS especialmente manipulada, lo que provoca la corrupción de los metadatos del montón de grub. En algunas circunstancias, el ataque también puede dañar los metadatos del montón del firmware UEFI. Como resultado, se puede lograr la ejecución de código arbitrario y eludir la protección de arranque seguro.

*Credits: N/A

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Local

Attack Complexity

High

Privileges Required

High

User Interaction

None

Scope

Changed

Confidentiality

High

Integrity

High

Availability

High

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2023-08-31 CVE Reserved
2023-10-04 CVE Published
2023-11-02 EPSS Updated
2024-11-23 CVE Updated
2024-11-23 First Exploit
---------- Exploited in Wild
---------- KEV Due Date

CWE

CWE-122: Heap-based Buffer Overflow
CWE-787: Out-of-bounds Write

CAPEC

References (12)

URL	Tag	Source
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/FUU42E7CPYLATXOYVYNW6YTXXULAOV6L
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/OIRJ5UZRXX2KLR4IKBJEQUNGOCXMMDLY
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/PERFILCHFEUGG3OAMC6W55P6DDIBZK4Q
https://lists.gnu.org/archive/html/grub-devel/2023-10/msg00028.html	Mailing List
https://seclists.org/oss-sec/2023/q4/37	Mailing List
https://security.gentoo.org/glsa/202311-14	Third Party Advisory
https://security.netapp.com/advisory/ntap-20231208-0002	Third Party Advisory

URL	Date	SRC
https://dfir.ru/2023/10/03/cve-2023-4692-cve-2023-4693-vulnerabilities-in-the-grub-boot-manager	2024-11-23

URL	Date	SRC

URL	Date	SRC
https://access.redhat.com/errata/RHSA-2024:2456	2024-05-22
https://access.redhat.com/errata/RHSA-2024:3184	2024-05-22
https://access.redhat.com/security/cve/CVE-2023-4692	2024-05-22
https://bugzilla.redhat.com/show_bug.cgi?id=2236613	2024-05-22

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Gnu Search vendor "Gnu"		Grub2 Search vendor "Gnu" for product "Grub2"				< 2.12 Search vendor "Gnu" for product "Grub2" and version " < 2.12"		-		Affected
Redhat Search vendor "Redhat"		Enterprise Linux Search vendor "Redhat" for product "Enterprise Linux"				8.0 Search vendor "Redhat" for product "Enterprise Linux" and version "8.0"		-		Affected
Redhat Search vendor "Redhat"		Enterprise Linux Search vendor "Redhat" for product "Enterprise Linux"				9.0 Search vendor "Redhat" for product "Enterprise Linux" and version "9.0"		-		Affected