CVE-2020-15705CWE-347

GRUB2: avoid loading unsigned kernels when GRUB is booted directly under secureboot without shim

Medium · published July 29, 2020

CVSS v3.1
6.4
EPSS
1%
Percentile
72.1
In the wild
Unconfirmed
What it is

GRUB2 fails to validate kernel signature when booted directly without shim, allowing secure boot to be bypassed. This only affects systems where the kernel signing certificate has been imported directly into the secure boot database and the GRUB image is booted directly without the use of shim. This issue affects GRUB2 version 2.04 and prior versions.

The record
Technical detail
CVSS v3.1
6.4 · MEDIUM
Vector
CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.01392 · 72.1th percentile
Weakness
CWE-347 · Improper Verification of Cryptographic Signature
Published
2020-07-29T17:45Z
EPSS history
Timeline
  • 29 JUL 17:45Z
    GRUB2: avoid loading unsigned kernels when GRUB is booted directly under secureboot without shim
    cvelistv5