// For flags

CVE-2019-18684

 

Severity Score

7.0
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

1
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

-
*SSVC
Descriptions

Sudo through 1.8.29 allows local users to escalate to root if they have write access to file descriptor 3 of the sudo process. This occurs because of a race condition between determining a uid, and the setresuid and openat system calls. The attacker can write "ALL ALL=(ALL) NOPASSWD:ALL" to /proc/#####/fd/3 at a time when Sudo is prompting for a password. NOTE: This has been disputed due to the way Linux /proc works. It has been argued that writing to /proc/#####/fd/3 would only be viable if you had permission to write to /etc/sudoers. Even with write permission to /proc/#####/fd/3, it would not help you write to /etc/sudoers

** EN DISPUTA ** Sudo versiones hasta 1.8.29, permite a los usuarios locales escalar a root si poseen acceso de escritura al descriptor de archivo 3 del proceso sudo. Esto se presenta debido a una condición de carrera entre la determinación de un uid y las llamadas al sistema setresuid y openat. El atacante puede escribir "ALL ALL=(ALL) NOPASSWD:ALL" en /proc/#####/fd/3 en un momento cuando Sudo solicita una contraseña. NOTA: Esto se ha disputado debido a la forma en que funciona Linux /proc. Se ha argumentado que escribir en /proc/#####/fd/3 solo sería viable si tuviera permiso para escribir en /etc/sudoers. Incluso con permiso de escritura en /proc/#####/fd/3, no le ayudaría a escribir en /etc/sudoers.

*Credits: N/A
CVSS Scores
Attack Vector
Local
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Attack Vector
Local
Attack Complexity
Medium
Authentication
None
Confidentiality
Complete
Integrity
Complete
Availability
Complete
* Common Vulnerability Scoring System
SSVC
  • Decision:-
Exploitation
-
Automatable
-
Tech. Impact
-
* Organization's Worst-case Scenario
Timeline
  • 2019-11-04 CVE Reserved
  • 2019-11-04 CVE Published
  • 2023-03-08 EPSS Updated
  • 2024-08-05 CVE Updated
  • 2024-08-05 First Exploit
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
CWE
  • CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
CAPEC
References (1)
URL Tag Source
URL Date SRC
https://gist.github.com/oxagast/51171aa161074188a11d96cbef884bbd 2024-08-05
URL Date SRC
URL Date SRC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Sudo Project
Search vendor "Sudo Project"
 Sudo
Search vendor "Sudo Project" for product "Sudo"
 <= 1.8.29
Search vendor "Sudo Project" for product "Sudo" and version " <= 1.8.29"
-
Affected