Buffer overflow in GNU Grub2
CVE-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, 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.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.005 (44.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 44th percentile — 44.3% 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-2023-4692 (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-2023-4692?
- CVE-2023-4692 is a high-severity vulnerability in GNU Grub2, classified under Heap-based Buffer Overflow. CVSS score: 7.5/10. Published 2023-10-25.
- How severe is CVE-2023-4692?
- High severity. CVSS v3 base score is 7.5 out of 10.
- Is CVE-2023-4692 known to be exploited?
- 11 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.