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6.4 Medium

CVE-2020-15705 GRUB2 fails to validate kernel signature when booted directly without shim, allowing secure boot to be bypassed

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 and versions

Product Affected versions Fixed in
grub2 in Ubuntu 2.04 earliest → < 2.04-1ubuntu26.1 2.04-1ubuntu26.1
grub2 in Ubuntu 2.02 earliest → < 2.02-2ubuntu8.16 2.02-2ubuntu8.16

References

Timeline

  1. Published
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The 3 CVEs of grub2 in Ubuntu →
CVE-2020-15707 Integer overflows were discovered in the functions grub_cmd_initrd and grub_initrd_init in the efilinux component of… 5.7 Medium CVE-2020-15706 GRUB2 contains a race condition in grub_script_function_create() leading to a use-after-free vulnerability which can… 6.4 Medium
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