CVE-2023-4692
published 2023-10-25CVE-2023-4692: 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…
PriorityP346high7.8CVSS 3.1
AVLACLPRLUINSUCHIHAH
EPSS
0.54%
41.6th percentile
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.
Affected
15 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| debian | grub2 | < grub2 2.06-13+deb12u1 (bookworm) | grub2 2.06-13+deb12u1 (bookworm) |
| gnu | grub2 | < 2.12 | 2.12 |
| gnu | grub2 | >= 0 < 2.06-3~deb11u6 | 2.06-3~deb11u6 |
| gnu | grub2 | >= 0 < 2.06-13+deb12u1 | 2.06-13+deb12u1 |
| gnu | grub2 | >= 0 < 2.12~rc1-11 | 2.12~rc1-11 |
| gnu | grub2 | >= 0 < 2.12~rc1-11 | 2.12~rc1-11 |
| msrc | azl3_grub2_2.06-18_on_azure_linux_3.0 | — | — |
| msrc | azl3_grub2_2.06-23_on_azure_linux_3.0 | — | — |
| msrc | azure_linux_3.0_arm | — | — |
| msrc | azure_linux_3.0_x64 | — | — |
| msrc | cbl2_grub2_2.06-13_on_cbl_mariner_2.0 | — | — |
| msrc | cbl_mariner_2.0_arm | — | — |
| msrc | cbl_mariner_2.0_x64 | — | — |
| redhat | enterprise_linux | — | — |
| redhat | enterprise_linux | — | — |
CVSS provenance
nvdv3.17.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
osv7.8HIGH
vendor_debian7.5HIGH
vendor_msrc7.5HIGH
vendor_redhat7.5HIGH
vendor_ubuntu7.5HIGH
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GHSA
GHSA-6w7h-fpm5-3ww6: An out-of-bounds write flaw was found in grub2's NTFS filesystem driver
ghsa_unreviewed·2023-10-25
CVE-2023-4692 [HIGH] CWE-122 GHSA-6w7h-fpm5-3ww6: An out-of-bounds write flaw was found in grub2's NTFS filesystem driver
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.
OSV
CVE-2023-4692: An out-of-bounds write flaw was found in grub2's NTFS filesystem driver
osv·2023-10-25·CVSS 7.8
CVE-2023-4692 [HIGH] CVE-2023-4692: An out-of-bounds write flaw was found in grub2's NTFS filesystem driver
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.
OSV
grub2-signed, grub2-unsigned vulnerabilities
osv·2023-10-04·CVSS 7.8
CVE-2023-4692 [HIGH] grub2-signed, grub2-unsigned vulnerabilities
grub2-signed, grub2-unsigned vulnerabilities
It was discovered that a specially crafted file system image could cause a
heap-based out-of-bounds write. A local attacker could potentially use this
to perform arbitrary code execution bypass and bypass secure boot
protections. (CVE-2023-4692)
It was discovered that a specially crafted file system image could cause an
out-of-bounds read. A physically-present attacker could possibly use this
to leak sensitive information to the GRUB pager. (CVE-2023-4693)
Microsoft
Grub2: out-of-bounds write at fs/ntfs.c may lead to unsigned code execution
vendor_msrc·2023-10-10·CVSS 7.5
CVE-2023-4692 [HIGH] CWE-787 Grub2: out-of-bounds write at fs/ntfs.c may lead to unsigned code execution
Grub2: out-of-bounds write at fs/ntfs.c may lead to unsigned code execution
FAQ: Is Azure Linux the only Microsoft product that includes this open-source library and is therefore potentially affected by this vulnerability?
One of the main benefits to our customers who choose to use the Azure Linux distro is the commitment to keep it up to date with the most recent and most secure versions of the open source libraries with which the distro is composed. Microsoft is committed to transparency in this work which is why we began publishing CSAF/VEX in October 2025. See this blog post for more information. If impact to additional products is identified, we will update the CVE to reflect this.
Mariner: Mariner
redhat: redhat
Customer Action Required: Yes
Remediation: CBL-Mariner Releases
Re
Ubuntu
GRUB2 vulnerabilities
vendor_ubuntu·2023-10-04·CVSS 7.5
CVE-2023-4692 [HIGH] GRUB2 vulnerabilities
Title: GRUB2 vulnerabilities
Summary: Several security issues were fixed in GRUB2.
It was discovered that a specially crafted file system image could cause a
heap-based out-of-bounds write. A local attacker could potentially use this
to perform arbitrary code execution bypass and bypass secure boot
protections. (CVE-2023-4692)
It was discovered that a specially crafted file system image could cause an
out-of-bounds read. A physically-present attacker could possibly use this
to leak sensitive information to the GRUB pager. (CVE-2023-4693)
Instructions: In general, a standard system update will make all the necessary changes.
Red Hat
grub2: Out-of-bounds write at fs/ntfs.c may lead to unsigned code execution
vendor_redhat·2023-10-03·CVSS 7.5
CVE-2023-4692 [HIGH] CWE-122 grub2: Out-of-bounds write at fs/ntfs.c may lead to unsigned code execution
grub2: Out-of-bounds write at fs/ntfs.c may lead to unsigned code execution
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.
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 pro
Debian
CVE-2023-4692: grub2 - An out-of-bounds write flaw was found in grub2's NTFS filesystem driver. This is...
vendor_debian·2023·CVSS 7.5
CVE-2023-4692 [HIGH] CVE-2023-4692: grub2 - An out-of-bounds write flaw was found in grub2's NTFS filesystem driver. This is...
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.
Scope: local
bookworm: resolved (fixed in 2.06-13+deb12u1)
bullseye: resolved (fixed in 2.06-3~deb11u6)
forky: resolved (fixed in 2.12~rc1-11)
sid: resolved (fixed in 2.12~rc1-11)
trixie: resolved (fixed in 2.12~rc1-11)
No detection rules found.
No public exploits indexed.
No writeups or analysis indexed.
https://access.redhat.com/errata/RHSA-2024:2456https://access.redhat.com/errata/RHSA-2024:3184https://access.redhat.com/security/cve/CVE-2023-4692https://bugzilla.redhat.com/show_bug.cgi?id=2236613https://dfir.ru/2023/10/03/cve-2023-4692-cve-2023-4693-vulnerabilities-in-the-grub-boot-manager/https://lists.gnu.org/archive/html/grub-devel/2023-10/msg00028.htmlhttps://seclists.org/oss-sec/2023/q4/37https://access.redhat.com/errata/RHSA-2024:2456https://access.redhat.com/errata/RHSA-2024:3184https://access.redhat.com/security/cve/CVE-2023-4692https://bugzilla.redhat.com/show_bug.cgi?id=2236613https://dfir.ru/2023/10/03/cve-2023-4692-cve-2023-4693-vulnerabilities-in-the-grub-boot-manager/https://lists.debian.org/debian-lts-announce/2023/10/msg00007.htmlhttps://lists.fedoraproject.org/archives/list/[email protected]/message/FUU42E7CPYLATXOYVYNW6YTXXULAOV6L/https://lists.fedoraproject.org/archives/list/[email protected]/message/OIRJ5UZRXX2KLR4IKBJEQUNGOCXMMDLY/https://lists.fedoraproject.org/archives/list/[email protected]/message/PERFILCHFEUGG3OAMC6W55P6DDIBZK4Q/https://lists.gnu.org/archive/html/grub-devel/2023-10/msg00028.htmlhttps://seclists.org/oss-sec/2023/q4/37https://security.gentoo.org/glsa/202311-14https://security.netapp.com/advisory/ntap-20231208-0002/
2023-10-25
Published