CVE-2020-14372
grub2 - security update
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.
How to fix CVE-2020-14372
To remediate CVE-2020-14372, upgrade the affected package to a fixed version below.
- —upgrade to 2.06-r0 or later
- —upgrade to 2.04-16 or later
- —upgrade to 2.02+dfsg1-20+deb10u4 or later
Is CVE-2020-14372 being exploited?
Low — EPSS is 1.5%, meaning exploitation activity has not been observed at scale.
Affected packages (3)
- from 0, < 2.06-r0
- from 0, < 2.04-16
- from 0, < 2.02+dfsg1-20+deb10u4
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH7.5 | CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H |