CVE-2023-48239

Nextcloud Server users can make external storage mount points inaccessible for other users

Severity Score

7.1

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

Nextcloud Server provides data storage for Nextcloud, an open source cloud platform. Starting in version 25.0.0 and prior to versions 25.0.13, 26.0.8, and 27.1.3 of Nextcloud Server and starting in version 20.0.0 and prior to versions 20.0.14.16, 21.0.9.13, 22.2.10.15, 23.0.12.12, 24.0.12.8, 25.0.13, 26.0.8, and 27.1.3 of Nextcloud Enterprise Server, a malicious user could update any personal or global external storage, making them inaccessible for everyone else as well. Nextcloud Server 25.0.13, 26.0.8, and 27.1.3 and Nextcloud Enterprise Server is upgraded to 20.0.14.16, 21.0.9.13, 22.2.10.15, 23.0.12.12, 24.0.12.8, 25.0.13, 26.0.8, and 27.1.3 contain a patch for this issue. As a workaround, disable app files_external. This workaround also makes the external storage inaccessible but retains the configurations until a patched version has been deployed.

Nextcloud Server proporciona almacenamiento de datos para Nextcloud, una plataforma en la nube de código abierto. A partir de la versión 25.0.0 y anteriores a las versiones 25.0.13, 26.0.8 y 27.1.3 de Nextcloud Server y a partir de la versión 20.0.0 y anteriores a las versiones 20.0.14.16, 21.0.9.13, 22.2.10.15, 23.0. 12.12, 24.0.12.8, 25.0.13, 26.0.8 y 27.1.3 de Nextcloud Enterprise Server, un usuario malintencionado podría actualizar cualquier almacenamiento externo personal o global, haciéndolo inaccesible para todos los demás también. Nextcloud Server 25.0.13, 26.0.8 y 27.1.3 y Nextcloud Enterprise Server se actualizan a 20.0.14.16, 21.0.9.13, 22.2.10.15, 23.0.12.12, 24.0.12.8, 25.0.13, 26.0.8 y 27.1.3 contiene un parche para este problema. Como workaround, deshabilite la aplicación files_external. Este workaround también hace que el almacenamiento externo sea inaccesible, pero conserva las configuraciones hasta que se implemente una versión parcheada.

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

Low

Availability

High

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Changed

Confidentiality

None

Integrity

Low

Availability

High

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2023-11-13 CVE Reserved
2023-11-21 CVE Published
2023-11-29 EPSS Updated
2024-08-02 CVE Updated
2024-08-02 First Exploit
---------- Exploited in Wild
---------- KEV Due Date

CWE

CWE-284: Improper Access Control

CAPEC

References (3)

URL	Tag	Source

URL	Date	SRC
https://hackerone.com/reports/2212627	2024-08-02

URL	Date	SRC
https://github.com/nextcloud/server/pull/41123	2023-11-29

URL	Date	SRC
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-f962-hw26-g267	2023-11-29

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"				>= 20.0.0 < 20.0.14.16 Search vendor "Nextcloud" for product "Nextcloud Server" and version " >= 20.0.0 < 20.0.14.16"		enterprise		Affected
Nextcloud Search vendor "Nextcloud"		Nextcloud Server Search vendor "Nextcloud" for product "Nextcloud Server"				>= 21.0.0 < 21.0.9.13 Search vendor "Nextcloud" for product "Nextcloud Server" and version " >= 21.0.0 < 21.0.9.13"		enterprise		Affected
Nextcloud Search vendor "Nextcloud"		Nextcloud Server Search vendor "Nextcloud" for product "Nextcloud Server"				>= 22.0.0 < 22.2.10.15 Search vendor "Nextcloud" for product "Nextcloud Server" and version " >= 22.0.0 < 22.2.10.15"		enterprise		Affected
Nextcloud Search vendor "Nextcloud"		Nextcloud Server Search vendor "Nextcloud" for product "Nextcloud Server"				>= 23.0.0 < 23.0.12.12 Search vendor "Nextcloud" for product "Nextcloud Server" and version " >= 23.0.0 < 23.0.12.12"		enterprise		Affected
Nextcloud Search vendor "Nextcloud"		Nextcloud Server Search vendor "Nextcloud" for product "Nextcloud Server"				>= 24.0.0 < 24.0.12.8 Search vendor "Nextcloud" for product "Nextcloud Server" and version " >= 24.0.0 < 24.0.12.8"		enterprise		Affected
Nextcloud Search vendor "Nextcloud"		Nextcloud Server Search vendor "Nextcloud" for product "Nextcloud Server"				>= 25.0.0 < 25.0.13 Search vendor "Nextcloud" for product "Nextcloud Server" and version " >= 25.0.0 < 25.0.13"		-		Affected
Nextcloud Search vendor "Nextcloud"		Nextcloud Server Search vendor "Nextcloud" for product "Nextcloud Server"				>= 25.0.0 < 25.0.13 Search vendor "Nextcloud" for product "Nextcloud Server" and version " >= 25.0.0 < 25.0.13"		enterprise		Affected
Nextcloud Search vendor "Nextcloud"		Nextcloud Server Search vendor "Nextcloud" for product "Nextcloud Server"				>= 26.0.0 < 26.0.8 Search vendor "Nextcloud" for product "Nextcloud Server" and version " >= 26.0.0 < 26.0.8"		-		Affected
Nextcloud Search vendor "Nextcloud"		Nextcloud Server Search vendor "Nextcloud" for product "Nextcloud Server"				>= 26.0.0 < 26.0.8 Search vendor "Nextcloud" for product "Nextcloud Server" and version " >= 26.0.0 < 26.0.8"		enterprise		Affected
Nextcloud Search vendor "Nextcloud"		Nextcloud Server Search vendor "Nextcloud" for product "Nextcloud Server"				>= 27.0.0 < 27.1.3 Search vendor "Nextcloud" for product "Nextcloud Server" and version " >= 27.0.0 < 27.1.3"		-		Affected
Nextcloud Search vendor "Nextcloud"		Nextcloud Server Search vendor "Nextcloud" for product "Nextcloud Server"				>= 27.0.0 < 27.1.3 Search vendor "Nextcloud" for product "Nextcloud Server" and version " >= 27.0.0 < 27.1.3"		enterprise		Affected