// For flags

CVE-2021-21396

Bulk list client endpoint exposes too much metadata about a client

Severity Score

6.5
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

-
*SSVC
Descriptions

wire-server is an open-source back end for Wire, a secure collaboration platform. In wire-server from version 2021-02-16 and before version 2021-03-02, the client metadata of all users was exposed in the `GET /users/list-clients` endpoint. The endpoint could be used by any logged in user who could request client details of any other user (no connection required) as far as they can find their User ID. The exposed metadata included id, class, type, location, time, and cookie. A user on a Wire backend could use this endpoint to find registration time and location for each device for a given list of users. As a workaround, remove `/list-clients` from nginx config. This has been fixed in version 2021-03-02.

wire-server es un back-end de código abierto para Wire, una plataforma de colaboración segura. En wire-server desde la versión 16-02-2021 y versiones anteriores a 02-03-2021, los metadatos del cliente de todos los usuarios estaban expuestos en el endpoint "GET/users/list-clients". El endpoint puede ser usado por cualquier usuario con inicio de sesión y que pueda pedir los detalles del cliente de cualquier otro usuario (no se requiere conexión) en la medida en que pueda encontrar su ID de usuario. Los metadatos expuestos incluían id, clase, tipo, ubicación, hora y cookie. Un usuario en un backend Wire podría usar este endpoint para encontrar la hora y la ubicación de registro para cada dispositivo para una lista determinada de usuarios. Como solución alternativa, elimine "/list-clients" de la configuración de nginx. Esto ha sido corregido en la versión 02-03-2021.

*Credits: N/A
CVSS Scores
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None
Attack Vector
Network
Attack Complexity
Low
Authentication
Single
Confidentiality
Partial
Integrity
None
Availability
None
* Common Vulnerability Scoring System
SSVC
  • Decision:-
Exploitation
-
Automatable
-
Tech. Impact
-
* Organization's Worst-case Scenario
Timeline
  • 2020-12-22 CVE Reserved
  • 2021-03-26 CVE Published
  • 2023-03-08 EPSS Updated
  • 2024-08-03 CVE Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-200: Exposure of Sensitive Information to an Unauthorized Actor
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Wire
Search vendor "Wire"
 Wire Server
Search vendor "Wire" for product "Wire Server"
 >= 2021-02-16 < 2021-03-02
Search vendor "Wire" for product "Wire Server" and version " >= 2021-02-16 < 2021-03-02"
-
Affected