Auth bypass in Fedora Project Coreos
CVE-2022-3675
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.
Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)
EPSS: 0.002 (6.9th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 2.6 (Low). Vector: CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N.
Affected products
- Fedora Project Coreos — versions testing 36.20220906.2.0 and later, next 36.20220906.1.0 and later, stable 36.20220820.3.0 and later
- Redhat Fedora_coreos
Weakness classification (CWE)
References
- patrick@puiterwijk.org (issue-tracking, Third Party Advisory, Issue Tracking)
- patrick@puiterwijk.org (release-notes, Mailing List, Vendor Advisory)
- patrick@puiterwijk.org (related, Vendor Advisory)
Frequently asked questions
- What is CVE-2022-3675?
- CVE-2022-3675 is a low-severity vulnerability in Fedora Project Coreos, classified under Improper Input Validation. CVSS score: 2.6/10. Published 2022-11-03.
- How severe is CVE-2022-3675?
- Low severity. CVSS v3 base score is 2.6 out of 10.