MEDIUM 6.4 Microsoft
CVE-2021-3418
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.
Microsoft Security Update 2021-Mar: 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.
Affected Products
- cbl2 grub2 2.06~rc1-7 on CBL Mariner 2.0
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-3418
- https://nvd.nist.gov/vuln/detail/CVE-2021-3418
This medium severity vulnerability with a CVSS score of 6.4 was published on 2021-03-09 via Microsoft. Affected: cbl2 grub2 2.06~rc1-7 on CBL Mariner 2.0.
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