// For flags

CVE-2021-37617

Untrusted Search Path in Nextcloud Desktop Client

Severity Score

7.3
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

-
*SSVC
Descriptions

The Nextcloud Desktop Client is a tool to synchronize files from Nextcloud Server with a computer. The Nextcloud Desktop Client invokes its uninstaller script when being installed to make sure there are no remnants of previous installations. In versions 3.0.3 through 3.2.4, the Client searches the `Uninstall.exe` file in a folder that can be written by regular users. This could lead to a case where a malicious user creates a malicious `Uninstall.exe`, which would be executed with administrative privileges on the Nextcloud Desktop Client installation. This issue is fixed in Nextcloud Desktop Client version 3.3.0. As a workaround, do not allow untrusted users to create content in the `C:\` system folder and verify that there is no malicious `C:\Uninstall.exe` file on the system.

Nextcloud Desktop Client es una herramienta para sincronizar archivos del servidor Nextcloud con un ordenador. El cliente de escritorio Nextcloud invoca su script de desinstalación cuando es instalado para asegurarse de que no se presentan restos de instalaciones anteriores. En versiones 3.0.3 hasta 3.2.4, el Cliente busca el archivo "Uninstall.exe" en una carpeta que puede ser escrita por usuarios habituales. Esto podría conllevar a un caso en el que un usuario malicioso creara un "Uninstall.exe" malicioso, que se ejecutaría con privilegios administrativos en la instalación de Nextcloud Desktop Client. Este problema es corregido en Nextcloud Desktop Client versión 3.3.0. Como solución, no permita que usuarios que no son confiables crear contenido en la carpeta del sistema "C:\" y verifique que no presente ningún archivo malicioso "C:\Uninstall.exe" en el sistema.

*Credits: N/A
CVSS Scores
Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
Required
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
  • 2021-07-29 CVE Reserved
  • 2021-08-18 CVE Published
  • 2023-03-11 EPSS Updated
  • 2024-08-04 CVE Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-426: Untrusted Search Path
  • CWE-427: Uncontrolled Search Path Element
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Nextcloud
Search vendor "Nextcloud"
 Desktop
Search vendor "Nextcloud" for product "Desktop"
 >= 3.0.3 < 3.3.0
Search vendor "Nextcloud" for product "Desktop" and version " >= 3.0.3 < 3.3.0"
-
Affected