Out-of-bounds Read in GNU Grub2
CVE-2023-4693
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.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.005 (40.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 40th percentile — 40.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000
Affected products
- GNU Grub2
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8 — versions 1:2.02-156.el8
- Red Hat Enterprise Linux 9 — versions 1:2.06-77.el9
- Red Hat Enterprise Linux — versions 8.0, 9.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- access.redhat.com/errata/RHSA-2024:2456 (vendor-advisory)
- access.redhat.com/errata/RHSA-2024:3184 (vendor-advisory)
- access.redhat.com/security/cve/CVE-2023-4693 (Third Party Advisory, vdb-entry)
- bugzilla.redhat.com/show_bug.cgi (issue-tracking, Third Party Advisory, Issue Tracking)
- dfir.ru/2023/10/03/cve-2023-4692-cve-2023-4693-vulnerabilities-in-the-grub-boot… (Exploit, Third Party Advisory)
- lists.gnu.org/archive/html/grub-devel/2023-10/msg00028.html (Mailing List)
- seclists.org/oss-sec/2023/q4/37 (Mailing List, Third Party Advisory)
- af854a3a-2127-422b-91ae-364da2661108
- af854a3a-2127-422b-91ae-364da2661108
- af854a3a-2127-422b-91ae-364da2661108
Frequently asked questions
- What is CVE-2023-4693?
- CVE-2023-4693 is a medium-severity vulnerability in GNU Grub2, classified under Out-of-bounds Read. CVSS score: 5.3/10. Published 2023-10-25.
- How severe is CVE-2023-4693?
- Medium severity. CVSS v3 base score is 5.3 out of 10.
- Is CVE-2023-4693 known to be exploited?
- 11 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.