Vulnerabilities > CVE-2021-3418 - Unspecified vulnerability in GNU Grub2

047910
CVSS 6.4 - MEDIUM
Attack vector
LOCAL
Attack complexity
HIGH
Privileges required
HIGH
Confidentiality impact
HIGH
Integrity impact
HIGH
Availability impact
HIGH
local
high complexity
gnu

Summary

If certificates that signed grub are installed into db, grub can be booted directly. It will then boot any kernel without signature validation. The booted kernel will think it was booted in secureboot mode and will implement lockdown, yet it could have been tampered. This flaw is a reintroduction of CVE-2020-15705 and only affects grub2 versions prior to 2.06 and upstream and distributions using the shim_lock mechanism.

Vulnerable Configurations

Part Description Count
Application
Gnu
8