CVE-2020-15705

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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTNIST
6.4 MEDIUM
LOCAL
HIGH
HIGH
CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
canonicalCNA
6.4 MEDIUM
LOCAL
HIGH
HIGH
CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
CVEADP
---
---
Base Score
CVSS 3.x
EPSS Score
Percentile: 5%
VendorProductVersion
gnugrub2
𝑥
≤ 2.04
redhatenterprise_linux_atomic_host
-
redhatopenshift_container_platform
4.0
canonicalubuntu_linux
14.04
canonicalubuntu_linux
16.04
canonicalubuntu_linux
18.04
canonicalubuntu_linux
20.04
debiandebian_linux
10.0
opensuseleap
15.1
opensuseleap
15.2
redhatenterprise_linux
7.0
redhatenterprise_linux
8.0
microsoftwindows_10
-
microsoftwindows_8.1
-
microsoftwindows_rt_8.1
-
microsoftwindows_server_2012
-
microsoftwindows_server_2016
-
microsoftwindows_server_2019
-
𝑥
= Vulnerable software versions
Debian logo
Debian Releases
Debian Product
Codename
grub2
bullseye (security)
2.06-3~deb11u6
fixed
bullseye
2.06-3~deb11u6
fixed
bookworm
2.06-13+deb12u1
fixed
bookworm (security)
2.06-13+deb12u1
fixed
sid
2.12-5
fixed
trixie
2.12-5
fixed
Ubuntu logo
Ubuntu Releases
Ubuntu Product
Codename
grub2
noble
not-affected
mantic
not-affected
lunar
not-affected
kinetic
not-affected
jammy
not-affected
hirsute
not-affected
groovy
not-affected
focal
Fixed 2.04-1ubuntu26.1
released
bionic
Fixed 2.02-2ubuntu8.16
released
xenial
Fixed 2.02~beta2-36ubuntu3.26
released
trusty
Fixed 2.02~beta2-9ubuntu1.20
released
grub2-signed
noble
not-affected
mantic
not-affected
lunar
not-affected
kinetic
not-affected
jammy
not-affected
hirsute
not-affected
groovy
not-affected
focal
Fixed 1.142.3
released
eoan
ignored
bionic
Fixed 1.93.18
released
xenial
Fixed 1.66.26
released
trusty
Fixed 1.34.22
released
grub2-unsigned
noble
not-affected
mantic
not-affected
lunar
not-affected
kinetic
not-affected
jammy
not-affected
focal
not-affected
bionic
not-affected
xenial
needed
trusty
dne
References