High severity · published Oct 25, 2023
CVE-2023-4692
An out-of-bounds write flaw was found in grub2's NTFS filesystem driver
7.8
CVSS
0.5%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack vector
Local
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 45% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
EL
Enterprise Linux · Redhat
8.0; 9.0 · source: NVD
GR
Grub2 · Gnu
before 2.12 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2023-4692
CVE.org
https://www.cve.org/CVERecord?id=CVE-2023-4692
access.redhat.com
https://access.redhat.com/errata/RHSA-2024:2456
access.redhat.com
https://access.redhat.com/errata/RHSA-2024:3184
Third Party Advisory
https://access.redhat.com/security/cve/CVE-2023-4692
Issue Tracking
https://bugzilla.redhat.com/show_bug.cgi?id=2236613
Exploit
https://dfir.ru/2023/10/03/cve-2023-4692-cve-2023-4693-vulnerabilities-in-the-grub-boot-manager/
Mailing List
https://lists.gnu.org/archive/html/grub-devel/2023-10/msg00028.html
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