Vulnerability Details : 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.
Products affected by CVE-2021-3418
- cpe:2.3:a:gnu:grub2:*:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2021-3418
0.04%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 10 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2021-3418
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
4.4
|
MEDIUM | AV:L/AC:M/Au:N/C:P/I:P/A:P |
3.4
|
6.4
|
NIST | |
|
6.4
|
MEDIUM | CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H |
0.5
|
5.9
|
NIST |
CWE ids for CVE-2021-3418
-
The product does not preserve permissions or incorrectly preserves permissions when copying, restoring, or sharing objects, which can cause them to have less restrictive permissions than intended.Assigned by: secalert@redhat.com (Primary)
References for CVE-2021-3418
-
https://bugzilla.redhat.com/show_bug.cgi?id=1933757
1933757 – (CVE-2021-3418) CVE-2021-3418 grub2: grub 2.05 reintroduced CVE-2020-15705Issue Tracking;Third Party Advisory
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