GRUB2: avoid loading unsigned kernels when GRUB is booted directly under secureboot without shim
13Vexday Risk Score
Sem sinal de exploração. Nenhum artefato público de exploração conhecido até agora.
ssvc Trackcvss 6.4epss 1.4%
probabilidade de exploração
1.4%top 30% das CVEs
exploração observada
nãonenhuma fonte reporta
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.
CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
Produtos afetados
Ubuntu · grub2 in UbuntuReferências
http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00067.htmlhttp://lists.opensuse.org/opensuse-security-announce/2020-08/msg00069.htmlhttps://access.redhat.com/security/vulnerabilities/grub2bootloaderhttps://lists.gnu.org/archive/html/grub-devel/2020-07/msg00034.htmlhttps://portal.msrc.microsoft.com/en-US/security-guidance/advisory/ADV200011https://security.gentoo.org/glsa/202104-05https://security.netapp.com/advisory/ntap-20200731-0008/https://usn.ubuntu.com/4432-1/https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/GRUB2SecureBootBypasshttps://www.debian.org/security/2020-GRUB-UEFI-SecureBoothttps://www.eclypsium.com/2020/07/29/theres-a-hole-in-the-boot/https://www.openwall.com/lists/oss-security/2020/07/29/3