Medium severity · published Oct 25, 2023
CVE-2023-4693
An out-of-bounds read flaw was found on grub2's NTFS filesystem driver
4.6
CVSS
0.5%
EPSS
No
On KEV
Description
An out-of-bounds read flaw was found on grub2's NTFS filesystem driver. This issue may allow a physically present attacker to present a specially crafted NTFS file system image to read arbitrary memory locations. A successful attack allows sensitive data cached in memory or EFI variable values to be leaked, presenting a high Confidentiality risk.
CVSS vector
CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Attack vector
Physical
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 42% 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-2023-4693
CVE.org
https://www.cve.org/CVERecord?id=CVE-2023-4693
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-2023-4693
Issue Tracking
https://bugzilla.redhat.com/show_bug.cgi?id=2238343
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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