CVE & CISA-KEV Catalog

CVE-2020-14372

HIGHEPSS 75th pctl
7.5
CVSS v3
NVD

Description

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.

CWE-184

How to fix

Remediation Available
grub2Debian
Fixed in:2.04-16CVE-2020-14372
Fixed in:2.04-16CVE-2020-14372
Fixed in:2.04-16CVE-2020-14372
Fixed in:2.04-16CVE-2020-14372
grub-efi-amd64-binUbuntu
Fixed in:2.04-1ubuntu44.1.2USN-4992-1
Fixed in:2.04-1ubuntu44.2USN-4992-1
grub-efi-amd64-signedUbuntu
Fixed in:1.167~18.04.5+2.04-1ubuntu44.1.2USN-4992-1
Fixed in:1.167.2+2.04-1ubuntu44.2USN-4992-1
grub-efi-arm64-binUbuntu
Fixed in:2.04-1ubuntu44.1.2USN-4992-1
Fixed in:2.04-1ubuntu44.2USN-4992-1
grub-efi-arm64-signedUbuntu
Fixed in:1.167~18.04.5+2.04-1ubuntu44.1.2USN-4992-1
Fixed in:1.167.2+2.04-1ubuntu44.2USN-4992-1
grub2-signedUbuntu
Fixed in:1.167~18.04.5USN-4992-1
Fixed in:1.167.2USN-4992-1
grub2-unsignedUbuntu
Fixed in:2.04-1ubuntu44.1.2USN-4992-1
Fixed in:2.04-1ubuntu44.2USN-4992-1

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorLocal
Attack ComplexityHigh
Privileges RequiredHigh
User InteractionNone
ScopeChanged

Impact

ConfidentialityHigh
IntegrityHigh
AvailabilityHigh

CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H

Exploit Intelligence

1.74%probability of exploitation in 30 days
75thpercentile

Elevated risk: more likely to be exploited than 75% of all known CVEs.

References

Other references1
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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.