GRUB2: avoid loading unsigned kernels when GRUB is booted directly under secureboot without shim
13Vexday Risk Score
Sin señal de explotación. Ningún artefacto público de explotación conocido hasta ahora.
ssvc Trackcvss 6.4epss 1.4%
probabilidad de explotación
1.4%top 30% de las CVE
explotación observada
noninguna fuente lo 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
Productos afectados
Ubuntu · grub2 in UbuntuReferencias
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