// For flags

CVE-2019-1836

Cisco Nexus 9000 Series Fabric Switches Application Centric Infrastructure Mode Symbolic Link Path Traversal Vulnerability

Severity Score

7.1
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

-
*SSVC
Descriptions

A vulnerability in the system shell for Cisco Nexus 9000 Series Fabric Switches in Application Centric Infrastructure (ACI) mode could allow an authenticated, local attacker to use symbolic links to overwrite system files. These system files may be sensitive and should not be overwritable by non-root users. The attacker would need valid device credentials. The vulnerability is due to incorrect symbolic link verification of directory paths when they are used in the system shell. An attacker could exploit this vulnerability by authenticating to the device and providing crafted user input to specific symbolic link CLI commands. Successful exploitation could allow the attacker to overwrite system files that should be restricted. This vulnerability has been fixed in software version 14.1(1i).

Una vulnerabilidad en la shell del sistema para Cisco Nexus 9000 Series Fabric Switches en modo Application Centric Infrastructure (ACI) podría permitir a un atacante local autenticado utilizar enlaces simbólicos para sobrescribir archivos de sistema. Estos archivos de sistema pueden ser sensibles y no deben ser sobrescribibles por usuarios no root. El atacante necesitaría credenciales de dispositivo válidas. La vulnerabilidad se debe a la verificación de enlaces simbólicos incorrectos de las rutas de directorio cuando se utilizan en la shell del sistema. Un atacante podría explotar esta vulnerabilidad autenticándose en el dispositivo y proporcionando una entrada de usuario diseñada para los comandos CLI de enlace simbólico específicos. Una explotación exitosa podría permitir que el atacante sobrescriba los archivos del sistema que deben ser restringidos. Esta vulnerabilidad ha sido corregida en la versión de software 14.1(1i).

*Credits: N/A
CVSS Scores
Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
High
Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
None
Attack Vector
Local
Attack Complexity
Low
Authentication
None
Confidentiality
None
Integrity
Complete
Availability
Complete
* Common Vulnerability Scoring System
SSVC
  • Decision:-
Exploitation
-
Automatable
-
Tech. Impact
-
* Organization's Worst-case Scenario
Timeline
  • 2018-12-06 CVE Reserved
  • 2019-05-03 CVE Published
  • 2023-03-08 EPSS Updated
  • 2024-09-16 CVE Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
  • CWE-59: Improper Link Resolution Before File Access ('Link Following')
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Cisco
Search vendor "Cisco"
 Nx-os
Search vendor "Cisco" for product "Nx-os"
 14.0\(3d\)
Search vendor "Cisco" for product "Nx-os" and version "14.0\(3d\)"
-
Affected
in Cisco
Search vendor "Cisco"
 Nexus 9300
Search vendor "Cisco" for product "Nexus 9300"
--
Safe
Cisco
Search vendor "Cisco"
 Nx-os
Search vendor "Cisco" for product "Nx-os"
 14.0\(3d\)
Search vendor "Cisco" for product "Nx-os" and version "14.0\(3d\)"
-
Affected
in Cisco
Search vendor "Cisco"
 Nexus 9500
Search vendor "Cisco" for product "Nexus 9500"
--
Safe