Auth bypass in Gnu Grub2
CVE-2020-27779
A flaw was found in grub2 in versions prior to 2.06. The cutmem command does not honor secure boot locking allowing an privileged attacker to remove address ranges from memory creating an opportunity to circumvent SecureBoot protections af…
EPSS: 0.004 (31.4th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H.
Affected products
- Gnu Grub2
- Netapp Ontap_select_deploy_administration_utility
- Fedoraproject Fedora — versions 33, 34
- Redhat Enterprise_linux — versions 7.0, 8.0
- Redhat Enterprise_linux_server_aus — versions 7.2, 7.3, 7.4
- Redhat Enterprise_linux_server_eus — versions 7.6, 7.7, 8.1
- Redhat Enterprise_linux_server_tus — versions 7.4, 7.6, 7.7
- Redhat Enterprise_linux_workstation — versions 7.0
- N/a Grub2 — versions grub 2.06
Weakness classification (CWE)
Public proof-of-concept exploits
References
- secalert@redhat.com (Third Party Advisory, x_refsource_MISC, Issue Tracking)
- secalert@redhat.com (x_refsource_FEDORA, vendor-advisory)
- secalert@redhat.com (vendor-advisory, Third Party Advisory, x_refsource_GENTOO)
- secalert@redhat.com (x_refsource_CONFIRM, Third Party Advisory)
Frequently asked questions
- What is CVE-2020-27779?
- CVE-2020-27779 is a high-severity vulnerability in Gnu Grub2, classified under Improper Authorization. CVSS score: 7.5/10. Published 2021-03-03.
- How severe is CVE-2020-27779?
- High severity. CVSS v3 base score is 7.5 out of 10.
- Is CVE-2020-27779 known to be exploited?
- 26 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.