// For flags

CVE-2021-32655

Files Drop public link can be added as federated share

Severity Score

3.5
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

-
*SSVC
Descriptions

Nextcloud Server is a Nextcloud package that handles data storage. In versions prior to 19.0.11, 20.0.10, and 21.0.2, an attacker is able to convert a Files Drop link to a federated share. This causes an issue on the UI side of the sharing user. When the sharing user opens the sharing panel and tries to remove the "Create" privileges of this unexpected share, Nextcloud server would silently grant the share read privileges. The vulnerability is patched in versions 19.0.11, 20.0.10 and 21.0.2. No workarounds are known to exist.

Nextcloud Server es un paquete de Nextcloud que maneja el almacenamiento de datos. En versiones anteriores a 19.0.11, 20.0.10 y 21.0.2, un atacante es capaz de convertir un enlace de Drop de archivos en un recurso compartido federado. Esto causa un problema en el lado de la Interfaz de Usuario del usuario que comparte. Cuando el usuario que comparte abre el panel para compartir y trata de eliminar los privilegios "Create" de este recurso compartido inesperado, el servidor de Nextcloud concede silenciosamente al recurso compartido privilegios de lectura. La vulnerabilidad está parcheada en versiones 19.0.11, 20.0.10 y 21.0.2. No se sabe que existan soluciones alternativas

*Credits: N/A
CVSS Scores
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
Required
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None
Attack Vector
Network
Attack Complexity
Medium
Authentication
Single
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
  • 2021-06-01 CVE Published
  • 2023-04-18 EPSS Updated
  • 2024-08-03 CVE Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-241: Improper Handling of Unexpected Data Type
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"
 < 19.0.11
Search vendor "Nextcloud" for product "Nextcloud Server" and version " < 19.0.11"
-
Affected
Nextcloud
Search vendor "Nextcloud"
 Nextcloud Server
Search vendor "Nextcloud" for product "Nextcloud Server"
 >= 20.0.0 < 20.0.10
Search vendor "Nextcloud" for product "Nextcloud Server" and version " >= 20.0.0 < 20.0.10"
-
Affected
Nextcloud
Search vendor "Nextcloud"
 Nextcloud Server
Search vendor "Nextcloud" for product "Nextcloud Server"
 >= 21.0.0 < 21.0.2
Search vendor "Nextcloud" for product "Nextcloud Server" and version " >= 21.0.0 < 21.0.2"
-
Affected