title: Grub2: bypass the grub password protection feature
description: An authentication bypass flaw was found in GRUB due to the way that GRUB uses the UUID of a device to search for the configuration file that contains the password hash for the GRUB password protection feature. An attacker capable of attaching an external drive such as a USB stick containing a file system with a duplicate UUID (the same as in the "/boot/" file system) can bypass the GRUB password protection feature on UEFI systems, which enumerate removable drives before non-removable ones. This issue was introduced in a downstream patch in Red Hat's version of grub2 and does not affect the upstream package.
problem types: Authentication Bypass by Spoofing
affected:
{
product: grub2
vendor: n/a
defaultStatus: affected
}
{
vendor: Red Hat
product: Red Hat Enterprise Linux 9
collectionURL: https://access.redhat.com/downloads/content/package-browser/
packageName: grub2
defaultStatus: affected
versions:
version: 1:2.06-70.el9_3.2, lessThan: *, versionType: rpm, status: unaffected
cpe: cpe:/o:redhat:enterprise_linux:9::baseos
}
{
vendor: Red Hat
product: Red Hat Enterprise Linux 9.0 Extended Update Support
collectionURL: https://access.redhat.com/downloads/content/package-browser/
packageName: grub2
defaultStatus: affected
versions:
version: 1:2.06-27.el9_0.16, lessThan: *, versionType: rpm, status: unaffected
cpe: cpe:/o:redhat:rhel_eus:9.0::baseos
}
{
vendor: Red Hat
product: Red Hat Enterprise Linux 9.2 Extended Update Support
collectionURL: https://access.redhat.com/downloads/content/package-browser/
packageName: grub2
defaultStatus: affected
versions:
version: 1:2.06-61.el9_2.2, lessThan: *, versionType: rpm, status: unaffected
cpe: cpe:/o:redhat:rhel_eus:9.2::baseos
}
{
vendor: Red Hat
product: Red Hat Enterprise Linux 8
collectionURL: https://access.redhat.com/downloads/content/package-browser/
packageName: grub2
defaultStatus: unaffected
cpes: cpe:/o:redhat:enterprise_linux:8
}
{
product: Fedora
vendor: Fedora
collectionURL: https://packages.fedoraproject.org/
packageName: grub2
defaultStatus: affected
}
metrics:
other: [
content: {'value': 'Moderate', 'namespace': 'https://access.redhat.com/security/updates/classification/'}
type: Red Hat severity rating
]