Vulnerability in GNU Grub2
CVE-2020-14372
A flaw was found in grub2 in versions prior to 2.06, where it incorrectly enables the usage of the ACPI command when Secure Boot is enabled. This flaw allows an attacker with privileged access to craft a Secondary System Description Table (SSDT) containing code to overwrite the Linux kernel lockdown variable content directly into memory. The table is further loaded and executed by the kernel, defeating its Secure Boot lockdown and allowing the attacker to load unsigned code. The highest threat from this vulnerability is to data confidentiality and integrity, as well as system availability.
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: 0.017 (77.4th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 77th percentile — 77.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.017 · newest: 0.017 · change: 0.000
Affected products
- GNU Grub2
- NetApp Cloud Backup
- NetApp Ontap Select Deploy Administration Utility
- Fedoraproject Fedora — versions 33, 34
- Red Hat Enterprise Linux — versions 7.0, 8.0
- Red Hat Enterprise Linux Server Aus — versions 7.2, 7.3, 7.4
- Red Hat Enterprise Linux Server Eus — versions 7.6, 7.7, 8.1
- Red Hat Enterprise Linux Server Tus — versions 7.4, 7.6, 7.7
- Red Hat Enterprise Linux Workstation — versions 7.0
- Grub2 — versions grub 2.06
Weakness classification (CWE)
Public proof-of-concept exploits
References
- bugzilla.redhat.com/show_bug.cgi (Third Party Advisory, Issue Tracking)
- access.redhat.com/security/vulnerabilities/RHSB-2021-003 (Patch, Third Party Advisory)
- security.netapp.com/advisory/ntap-20210416-0004/ (Third Party Advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- security.gentoo.org/glsa/202104-05 (vendor-advisory, Third Party Advisory)
Frequently asked questions
- What is CVE-2020-14372?
- CVE-2020-14372 is a high-severity vulnerability in GNU Grub2, classified under Incomplete List of Disallowed Inputs. CVSS score: 7.5/10. Published 2021-03-03.
- How severe is CVE-2020-14372?
- High severity. CVSS v3 base score is 7.5 out of 10.
- Is CVE-2020-14372 known to be exploited?
- 29 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.