Description
GRUB2 fails to validate kernel signature when booted directly without shim, allowing secure boot to be bypassed. This only affects systems where the kernel signing certificate has been imported directly into the secure boot database and the GRUB image is booted directly without the use of shim. This issue affects GRUB2 version 2.04 and prior versions.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Ubuntu grub2 in Ubuntu
20.04 LTS to < 2.04-1ubuntu26.1affected18.04 LTS to < 2.02-2ubuntu8.16affected16.04 LTS to < 2.02~beta2-36ubuntu3.26affected14.04 ESM to < 2.02~beta2-9ubuntu1.20affected
References
- https://www.eclypsium.com/2020/07/29/theres-a-hole-in-the-boot/ ↗
- https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/GRUB2SecureBootBypass ↗
- http://ubuntu.com/security/notices/USN-4432-1 ↗
- https://www.debian.org/security/2020-GRUB-UEFI-SecureBoot ↗
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/ADV200011 ↗
- https://access.redhat.com/security/vulnerabilities/grub2bootloader ↗
- https://www.suse.com/c/suse-addresses-grub2-secure-boot-issue/ ↗
- https://www.suse.com/support/kb/doc/?id=000019673 ↗
- https://www.openwall.com/lists/oss-security/2020/07/29/3 ↗
- https://lists.gnu.org/archive/html/grub-devel/2020-07/msg00034.html ↗
- http://www.openwall.com/lists/oss-security/2020/07/29/3 ↗
- https://security.netapp.com/advisory/ntap-20200731-0008/ ↗
- https://usn.ubuntu.com/4432-1/ ↗
- http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00067.html ↗
- http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00069.html ↗
- http://www.openwall.com/lists/oss-security/2021/03/02/3 ↗
- https://security.gentoo.org/glsa/202104-05 ↗
- http://www.openwall.com/lists/oss-security/2021/09/17/2 ↗
- http://www.openwall.com/lists/oss-security/2021/09/17/4 ↗
- http://www.openwall.com/lists/oss-security/2021/09/21/1 ↗