description: Fedora CoreOS supports setting a GRUB bootloader password
using a Butane config. When this feature is enabled, GRUB requires a password to access the
GRUB command-line, modify kernel command-line arguments, or boot
non-default OSTree deployments.  Recent Fedora CoreOS releases have a
misconfiguration which allows booting non-default OSTree deployments
without entering a password.  This allows someone with access to the
GRUB menu to boot into an older version of Fedora CoreOS, reverting
any security fixes that have recently been applied to the machine.  A
password is still required to modify kernel command-line arguments and
to access the GRUB command line.
problem types: CWE-20 Improper Input Validation
affected:
{
defaultStatus: unaffected
packageName: coreos-assembler
product: CoreOS
vendor: Fedora Project
versions:
lessThan: testing 36.20221030.2.0 , status: affected, version: testing 36.20220906.2.0 and later, versionType: fix
lessThan: next 37.20221031.1.0, status: affected, version: next 36.20220906.1.0 and later, versionType: fix
lessThan: stable 36.20221014.3.0, status: affected, version: stable 36.20220820.3.0 and later, versionType: fix
}
metrics:
cvssV3_1: [
attackComplexity: LOW
attackVector: PHYSICAL
availabilityImpact: NONE
baseScore: 2.6
baseSeverity: LOW
confidentialityImpact: NONE
integrityImpact: LOW
privilegesRequired: NONE
scope: CHANGED
userInteraction: NONE
vectorString: CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
version: 3.1
]
format: CVSS
scenarios: GENERAL