CVE-2020-15705

EUVD-2020-7691
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
NISTPrimary
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
Base Score
CVSS 3.x
EPSS Score
Percentile: 9%
Affected Products (NVD)
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
bookworm
2.06-13+deb12u1
fixed
bookworm (security)
2.06-13+deb12u1
fixed
bullseye
2.06-3~deb11u6
fixed
bullseye (security)
2.06-3~deb11u6
fixed
sid
2.12-5
fixed
trixie
2.12-5
fixed
Ubuntu logo
Ubuntu Releases
Ubuntu Product
Codename
grub2
bionic
Fixed 2.02-2ubuntu8.16
released
focal
Fixed 2.04-1ubuntu26.1
released
groovy
not-affected
hirsute
not-affected
jammy
not-affected
kinetic
not-affected
lunar
not-affected
mantic
not-affected
noble
not-affected
trusty
Fixed 2.02~beta2-9ubuntu1.20
released
xenial
Fixed 2.02~beta2-36ubuntu3.26
released
grub2-signed
bionic
Fixed 1.93.18
released
eoan
ignored
focal
Fixed 1.142.3
released
groovy
not-affected
hirsute
not-affected
jammy
not-affected
kinetic
not-affected
lunar
not-affected
mantic
not-affected
noble
not-affected
trusty
Fixed 1.34.22
released
xenial
Fixed 1.66.26
released
grub2-unsigned
bionic
not-affected
focal
not-affected
jammy
not-affected
kinetic
not-affected
lunar
not-affected
mantic
not-affected
noble
not-affected
trusty
dne
xenial
needed
References