// For flags

CVE-2021-32766

Nextcloud Text app can disclose existence of folders in "File Drop" link share

Severity Score

5.3
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

-
*SSVC
Descriptions

Nextcloud Text is an open source plaintext editing application which ships with the nextcloud server. In affected versions the Nextcloud Text application returned different error messages depending on whether a folder existed in a public link share. This is problematic in case the public link share has been created with "Upload Only" privileges. (aka "File Drop"). A link share recipient is not expected to see which folders or files exist in a "File Drop" share. Using this vulnerability an attacker is able to enumerate folders in such a share. Exploitation requires that the attacker has access to a valid affected "File Drop" link share. It is recommended that the Nextcloud Server is upgraded to 20.0.12, 21.0.4 or 22.0.1. Users who are unable to upgrade are advised to disable the Nextcloud Text application in the app settings.

Nextcloud Text es una aplicación de edición de texto plano de código abierto que se suministra con el servidor nextcloud. En las versiones afectadas la aplicación Nextcloud Text devolvía diferentes mensajes de error dependiendo de si una carpeta existía en un enlace público compartido. Esto es problemático en el caso de que el recurso compartido de enlace público haya sido creado con privilegios "Upload Only". (también se conoce como "File Drop"). No se espera que un destinatario de un enlace compartido vea qué carpetas o archivos existen en un recurso compartido "File Drop". Usando esta vulnerabilidad un atacante es capaz de enumerar las carpetas en dicho recurso compartido. La explotación requiere que el atacante tenga acceso a un recurso compartido de enlace "File Drop" válido y afectado. Se recomienda actualizar el servidor Nextcloud a la versión 20.0.12, 21.0.4 o 22.0.1. Los usuarios que no puedan actualizar se les aconseja deshabilitar la aplicación Nextcloud Text en la configuración de la aplicación

*Credits: N/A
CVSS Scores
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None
Attack Vector
Network
Attack Complexity
Low
Authentication
None
Confidentiality
Partial
Integrity
None
Availability
None
* Common Vulnerability Scoring System
SSVC
  • Decision:-
Exploitation
-
Automatable
-
Tech. Impact
-
* Organization's Worst-case Scenario
Timeline
  • 2021-05-12 CVE Reserved
  • 2021-09-07 CVE Published
  • 2024-05-23 EPSS Updated
  • 2024-08-03 CVE Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-209: Generation of Error Message Containing Sensitive Information
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"
 Nextcloud Server
Search vendor "Nextcloud" for product "Nextcloud Server"
 < 20.0.12
Search vendor "Nextcloud" for product "Nextcloud Server" and version " < 20.0.12"
-
Affected
Nextcloud
Search vendor "Nextcloud"
 Nextcloud Server
Search vendor "Nextcloud" for product "Nextcloud Server"
 >= 21.0.0 < 21.0.4
Search vendor "Nextcloud" for product "Nextcloud Server" and version " >= 21.0.0 < 21.0.4"
-
Affected
Nextcloud
Search vendor "Nextcloud"
 Nextcloud Server
Search vendor "Nextcloud" for product "Nextcloud Server"
 >= 22.0.0 < 22.1.0
Search vendor "Nextcloud" for product "Nextcloud Server" and version " >= 22.0.0 < 22.1.0"
-
Affected