CVE-2021-20233

EUVD-2021-7672
A flaw was found in grub2 in versions prior to 2.06. Setparam_prefix() in the menu rendering code performs a length calculation on the assumption that expressing a quoted single quote will require 3 characters, while it actually requires 4 characters which allows an attacker to corrupt memory by one byte for each quote in the input. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
8.2 HIGH
LOCAL
LOW
HIGH
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
Base Score
CVSS 3.x
EPSS Score
Percentile: 32%
Affected Products (NVD)
VendorProductVersion
gnugrub2
𝑥
< 2.06
redhatenterprise_linux
7.0
redhatenterprise_linux
8.0
redhatenterprise_linux_server_aus
7.2
redhatenterprise_linux_server_aus
7.3
redhatenterprise_linux_server_aus
7.4
redhatenterprise_linux_server_aus
7.6
redhatenterprise_linux_server_aus
7.7
redhatenterprise_linux_server_aus
8.2
redhatenterprise_linux_server_eus
7.6
redhatenterprise_linux_server_eus
7.7
redhatenterprise_linux_server_eus
8.1
redhatenterprise_linux_server_tus
7.4
redhatenterprise_linux_server_tus
7.6
redhatenterprise_linux_server_tus
7.7
redhatenterprise_linux_server_tus
8.2
redhatenterprise_linux_workstation
7.0
netappontap_select_deploy_administration_utility
-
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
stretch
ignored
trixie
2.12-5
fixed
Ubuntu logo
Ubuntu Releases
Ubuntu Product
Codename
grub2
bionic
not-affected
focal
not-affected
jammy
not-affected
kinetic
not-affected
lunar
not-affected
mantic
not-affected
noble
not-affected
trusty
not-affected
xenial
not-affected
grub2-signed
bionic
Fixed 1.167~18.04.5
released
focal
Fixed 1.167.2
released
groovy
Fixed 1.167.2
released
hirsute
Fixed 1.164
released
impish
Fixed 1.169
released
jammy
not-affected
kinetic
not-affected
lunar
not-affected
mantic
not-affected
noble
not-affected
trusty
needed
xenial
Fixed 1.164
released
grub2-unsigned
bionic
Fixed 2.04-1ubuntu44.1.2
released
focal
Fixed 2.04-1ubuntu44.2
released
groovy
Fixed 2.04-1ubuntu44.2
released
hirsute
Fixed 2.04-1ubuntu42
released
impish
Fixed 2.04-1ubuntu45
released
jammy
not-affected
kinetic
not-affected
lunar
not-affected
mantic
not-affected
noble
not-affected
trusty
dne
xenial
Fixed 2.04-1ubuntu42
released
Common Weakness Enumeration
References
https://bugzilla.redhat.com/show_bug.cgi?id=1926263
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZWZ36QK4IKU6MWDWNOOWKPH3WXZBHT2R/
https://security.gentoo.org/glsa/202104-05
https://security.netapp.com/advisory/ntap-20220325-0001/
https://bugzilla.redhat.com/show_bug.cgi?id=1926263
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZWZ36QK4IKU6MWDWNOOWKPH3WXZBHT2R/
https://security.gentoo.org/glsa/202104-05
https://security.netapp.com/advisory/ntap-20220325-0001/