CVE-2021-3418CWE-281

If certificates that signed grub are installed into db, grub can be booted directly

published March 15, 2021

CVSS
—
EPSS
0%
Percentile
39.4
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS
Not scored
CVSS v4.0
Not supplied
EPSS
0.00466 · 39.4th percentile
Weakness
CWE-281 · Improper Preservation of Permissions
Published
2021-03-15T21:17Z
EPSS history
Timeline
  • 15 MAR 21:17Z
    If certificates that signed grub are installed into db, grub can be booted directly
    cvelistv5