CVEvulnerability

CVE-2021-3418

6.4 MEDIUM Published 2021-03-15 Modified 2026-06-17 Official page ↗
Status
Modified
Published
2021-03-15
Last modified
2026-06-17
Assigner
[email protected]
CVSS 3.1 ([email protected])
6.4 MEDIUM — CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
CVSS 2.0 ([email protected])
4.4 MEDIUM — AV:L/AC:M/Au:N/C:P/I:P/A:P
Weaknesses
CWE-281

Description

If certificates that signed grub are installed into db, grub can be booted directly. It will then boot any kernel without signature validation. The booted kernel will think it was booted in secureboot mode and will implement lockdown, yet it could have been tampered. This flaw is a reintroduction of CVE-2020-15705 and only affects grub2 versions prior to 2.06 and upstream and distributions using the shim_lock mechanism.

Affected configurations

• gnu grub2 (< 2.06)

Related

Weakness · CWE (1)

  • CWE-281 Improper Preservation of Permissions weakness

References