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
EPSS: 0.005 (39.7th percentile) — read the EPSS interpretation.
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.
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
- Redhat Enterprise_linux — versions 8.0, 9.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- secalert@redhat.com (x_refsource_REDHAT, vendor-advisory)
- secalert@redhat.com (x_refsource_REDHAT, vendor-advisory)
- secalert@redhat.com (x_refsource_REDHAT, Third Party Advisory, vdb-entry)
- secalert@redhat.com (x_refsource_REDHAT, issue-tracking, Third Party Advisory, Issue Tracking)
- secalert@redhat.com (Exploit, Third Party Advisory)
- secalert@redhat.com (Mailing List)
- secalert@redhat.com (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.