CVE-2021-3418
Published: 02 March 2021
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.
Priority
Medium
CVSS 3 base score: 6.4
Status
| Package | Release | Status |
|---|---|---|
|
grub2 Launchpad, Ubuntu, Debian |
Upstream |
Needs triage
|
| Ubuntu 21.04 (Hirsute Hippo) |
Not vulnerable
|
|
| Ubuntu 20.10 (Groovy Gorilla) |
Not vulnerable
|
|
| Ubuntu 20.04 LTS (Focal Fossa) |
Not vulnerable
|
|
| Ubuntu 18.04 LTS (Bionic Beaver) |
Not vulnerable
|
|
| Ubuntu 16.04 ESM (Xenial Xerus) |
Not vulnerable
|
|
| Ubuntu 14.04 ESM (Trusty Tahr) |
Not vulnerable
|
|
|
grub2-signed Launchpad, Ubuntu, Debian |
Upstream |
Needs triage
|
| Ubuntu 21.04 (Hirsute Hippo) |
Not vulnerable
|
|
| Ubuntu 20.10 (Groovy Gorilla) |
Not vulnerable
|
|
| Ubuntu 20.04 LTS (Focal Fossa) |
Not vulnerable
|
|
| Ubuntu 18.04 LTS (Bionic Beaver) |
Not vulnerable
|
|
| Ubuntu 16.04 ESM (Xenial Xerus) |
Not vulnerable
|
|
| Ubuntu 14.04 ESM (Trusty Tahr) |
Not vulnerable
|
|
|
grub2-unsigned Launchpad, Ubuntu, Debian |
Upstream |
Needs triage
|
| Ubuntu 21.04 (Hirsute Hippo) |
Not vulnerable
|
|
| Ubuntu 20.10 (Groovy Gorilla) |
Not vulnerable
|
|
| Ubuntu 20.04 LTS (Focal Fossa) |
Not vulnerable
|
|
| Ubuntu 18.04 LTS (Bionic Beaver) |
Not vulnerable
|
|
| Ubuntu 16.04 ESM (Xenial Xerus) |
Not vulnerable
|
|
| Ubuntu 14.04 ESM (Trusty Tahr) |
Not vulnerable
|