CVE-2022-3675
Recent Fedora CoreOS releases have a misconfiguration which allows booting non-default OSTree deployments without entering a password.
Does this matter?
Lower severity and a low EPSS score (0.18%). Track it; it rarely justifies an emergency change on its own.
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.
- CVSS 3.1
- 5.5 MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
- EPSS
- 0.18% probability · 7th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-20, CWE-306
- Affected
- redhat/fedora coreos
- Source
- patrick@puiterwijk.org
References
- https://docs.fedoraproject.org/en-US/fedora-coreos/grub-password/Vendor Advisory
- https://github.com/coreos/fedora-coreos-tracker/issues/1333Issue Tracking, Third Party Advisory
- https://lists.fedoraproject.org/archives/list/coreos-status@lists.fedoraproject.org/thread/NHUCNH5Y4UH5DPUCXISYXXVA563TLFEJ/Mailing List, Vendor Advisory
- https://docs.fedoraproject.org/en-US/fedora-coreos/grub-password/Vendor Advisory
- https://github.com/coreos/fedora-coreos-tracker/issues/1333Issue Tracking, Third Party Advisory
- https://lists.fedoraproject.org/archives/list/coreos-status@lists.fedoraproject.org/thread/NHUCNH5Y4UH5DPUCXISYXXVA563TLFEJ/Mailing List, Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.