CVE-2021-41239

User enumeration setting not respected in Nextcloud server

Severity Score

5.3

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

Nextcloud server is a self hosted system designed to provide cloud style services. In affected versions the User Status API did not consider the user enumeration settings by the administrator. This allowed a user to enumerate other users on the instance, even when user listings where disabled. It is recommended that the Nextcloud Server is upgraded to 20.0.14, 21.0.6 or 22.2.1. There are no known workarounds.

Nextcloud server es un sistema auto-alojado diseñado para proporcionar servicios de estilo en la nube. En las versiones afectadas, la API de estado de usuario no tenía en cuenta la configuración de enumeración de usuarios por parte del administrador. Esto permitía a un usuario enumerar a otros usuarios en la instancia, incluso cuando los listados de usuarios estaban deshabilitados. Es recomendado actualizar el servidor Nextcloud a versiones 20.0.14, 21.0.6 o 22.2.1. No se presentan medidas de mitigación conocidas

*Credits: N/A

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

2021-09-15 CVE Reserved
2022-03-08 CVE Published
2024-08-04 CVE Updated
2024-11-21 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-200: Exposure of Sensitive Information to an Unauthorized Actor
CWE-862: Missing Authorization

CAPEC

References (4)

URL	Tag	Source
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-g722-cm3h-8wrx	Issue Tracking

URL	Date	SRC

URL	Date	SRC
https://github.com/nextcloud/server/issues/27122	2022-10-24
https://github.com/nextcloud/server/pull/29260	2022-10-24

URL	Date	SRC
https://security.gentoo.org/glsa/202208-17	2022-10-24

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"				< 20.0.14 Search vendor "Nextcloud" for product "Nextcloud Server" and version " < 20.0.14"		-		Affected
Nextcloud Search vendor "Nextcloud"		Nextcloud Server Search vendor "Nextcloud" for product "Nextcloud Server"				>= 21.0.0 < 21.0.6 Search vendor "Nextcloud" for product "Nextcloud Server" and version " >= 21.0.0 < 21.0.6"		-		Affected
Nextcloud Search vendor "Nextcloud"		Nextcloud Server Search vendor "Nextcloud" for product "Nextcloud Server"				22.2.0 Search vendor "Nextcloud" for product "Nextcloud Server" and version "22.2.0"		-		Affected