CVE Vulnerability

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.

4.4 /10

CVSS v2.0 :

V3 Legend

Vector :

Exploitability : 3.4 / Impact : 6.4

Attack Vector

Attack Complexity

Privileges Required

User Interaction

Confidentiality Impact PARTIAL

Integrity Impact PARTIAL

Availability Impact PARTIAL

Scope

6.4 /10

CVSS v3.0 : MEDIUM

V3 Legend

Vector :

Exploitability : 0.5 / Impact : 5.9

Attack Vector LOCAL

Attack Complexity HIGH

Privileges Required HIGH

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References
Link Resource
https://bugzilla.redhat.com/show_bug.cgi?id=1933757 Issue Tracking Third Party Advisory
Configurations

Configuration 1

cpe:2.3:a:gnu:grub2:*:*:*:*:*:*:*:*
Information

Published : 2021-03-15 10:15

Updated : 2021-03-22 04:45

NVD link : CVE-2021-3418

Mitre link : CVE-2021-3418

Products Affected
No products.
CWE
CWE-281

Improper Preservation of Permissions