// For flags

CVE-2009-4128

Ubuntu Security Notice 868-1

Severity Score

9.8
*CVSS v3

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

1
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

-
*SSVC
Descriptions

GNU GRand Unified Bootloader (GRUB) 2 1.97 only compares the submitted portion of a password with the actual password, which makes it easier for physically proximate attackers to conduct brute force attacks and bypass authentication by submitting a password whose length is 1.

GNU GRand Unified Bootloader (GRUB) 2 v1.97 únicamente compara el fragmento enviado de una contraseña con la contraseña actual, lo que facilita que atacantes próximos realicen ataques de fuerza bruta y eviten la autenticación mediante el envío de una contraseña de longitud 1.

It was discovered that GRUB 2 did not properly validate passwords. An attacker with physical access could conduct a brute force attack and bypass authentication by submitting a 1 character password.

*Credits: N/A
CVSS Scores
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Attack Vector
Local
Attack Complexity
Low
Authentication
None
Confidentiality
Complete
Integrity
Complete
Availability
Complete
* Common Vulnerability Scoring System
SSVC
  • Decision:-
Exploitation
-
Automatable
-
Tech. Impact
-
* Organization's Worst-case Scenario
Timeline
  • 2009-11-30 CVE Reserved
  • 2009-12-01 CVE Published
  • 2024-08-07 CVE Updated
  • 2024-08-07 First Exploit
  • 2025-03-30 EPSS Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
CWE
  • CWE-287: Improper Authentication
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Gnu
Search vendor "Gnu"
 Grub 2
Search vendor "Gnu" for product "Grub 2"
 1.97
Search vendor "Gnu" for product "Grub 2" and version "1.97"
-
Affected