// For flags

CVE-2021-3418

 

Severity Score

6.4
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

-
*SSVC
Descriptions

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.

Si los certificados que firmaron grub están instalados en db, grub puede ser arrancado directamente. Entonces arrancará cualquier kernel sin comprobación de firma. El kernel arrancado pensará que ha sido arrancado en modo secureboot e implementará el bloqueo, aunque podría haber sido manipulado. Este fallo es una reintroducción de CVE-2020-15705 y sólo afecta a las versiones de grbu2 anteriores a la 2.06 y a las distribuciones que usan el mecanismo shim_lock

*Credits: N/A
CVSS Scores
Attack Vector
Local
Attack Complexity
High
Privileges Required
High
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Attack Vector
Local
Attack Complexity
Medium
Authentication
None
Confidentiality
Partial
Integrity
Partial
Availability
Partial
* Common Vulnerability Scoring System
SSVC
  • Decision:-
Exploitation
-
Automatable
-
Tech. Impact
-
* Organization's Worst-case Scenario
Timeline
  • 2021-03-01 CVE Reserved
  • 2021-03-15 CVE Published
  • 2023-03-08 EPSS Updated
  • 2024-08-03 CVE Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-281: Improper Preservation of Permissions
CAPEC
References (1)
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Gnu
Search vendor "Gnu"
Grub2
Search vendor "Gnu" for product "Grub2"
< 2.06
Search vendor "Gnu" for product "Grub2" and version " < 2.06"
-
Affected