CVE-2016-9463

Severity Score

8.1

*CVSS v3

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

Nextcloud Server before 9.0.54 and 10.0.1 & ownCloud Server before 9.1.2, 9.0.6, and 8.2.9 suffer from SMB User Authentication Bypass. Nextcloud/ownCloud include an optional and not by default enabled SMB authentication component that allows authenticating users against an SMB server. This backend is implemented in a way that tries to connect to a SMB server and if that succeeded consider the user logged-in. The backend did not properly take into account SMB servers that have any kind of anonymous auth configured. This is the default on SMB servers nowadays and allows an unauthenticated attacker to gain access to an account without valid credentials. Note: The SMB backend is disabled by default and requires manual configuration in the Nextcloud/ownCloud config file. If you have not configured the SMB backend then you're not affected by this vulnerability.

Nextcloud Server en versiones anteriores a 9.0.54 y 10.0.1 y ownCloud Server en versiones anteirores a 9.1.2, 9.0.6 y 8.2.9 sufren de Bypass de autenticación de usuario SMB. Nextcloud/ownCloud Incluye un componente de autenticación SMB opcional y no predeterminado que permite autenticar a los usuarios en un servidor SMB. Este backend se implementa de una manera que intenta conectarse a un servidor SMB y si eso sucede considerar al usuario conectado. El backend no tomó correctamente en cuenta los servidores SMB que tienen cualquier tipo de configuración anónima. Este es el valor predeterminado en los servidores SMB en la actualidad y permite a un atacante no autenticado acceder a una cuenta sin credenciales válidas. Nota: El servidor SMB está deshabilitado de forma predeterminada y requiere una configuración manual en el archivo de configuración Nextcloud/ownCloud. Si no has configurado el servidor SMB, no te verás afectado por esta vulnerabilidad.

*Credits: N/A

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Network

Attack Complexity

Medium

Authentication

None

Confidentiality

Partial

Integrity

Partial

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2016-11-19 CVE Reserved
2017-03-28 CVE Published
2024-08-06 CVE Updated
2024-08-06 First Exploit
2024-09-07 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date

CWE

CWE-287: Improper Authentication
CWE-303: Incorrect Implementation of Authentication Algorithm

CAPEC

References (9)

URL	Tag	Source

URL	Date	SRC
https://hackerone.com/reports/148151	2024-08-06
https://rhinosecuritylabs.com/2016/10/operation-ownedcloud-exploitation-post-exploitation-persistence	2024-08-06

URL	Date	SRC
https://github.com/nextcloud/apps/commit/b85ace6840b8a6704641086bc3b8eb8e81cb2274	2019-10-09
https://github.com/nextcloud/apps/commit/decb91fd31f4ffab191cbf09ce4e5c55c67a4087	2019-10-09
https://github.com/owncloud/apps/commit/16cbccfc946c8711721fa684d78135ca1fb64791	2019-10-09
https://github.com/owncloud/apps/commit/5d47e7b52646cf79edadd78ce10c754290cbb732	2019-10-09
https://github.com/owncloud/apps/commit/a0e07b7ddd5a5fd850a6e07f8457d05b76a300b3	2019-10-09
https://nextcloud.com/security/advisory/?id=nc-sa-2016-006	2019-10-09
https://owncloud.org/security/advisory/?id=oc-sa-2016-017	2019-10-09

URL	Date	SRC

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"				< 9.0.54 Search vendor "Nextcloud" for product "Nextcloud Server" and version " < 9.0.54"		-		Affected
Nextcloud Search vendor "Nextcloud"		Nextcloud Server Search vendor "Nextcloud" for product "Nextcloud Server"				>= 10.0.0 < 10.0.1 Search vendor "Nextcloud" for product "Nextcloud Server" and version " >= 10.0.0 < 10.0.1"		-		Affected
Owncloud Search vendor "Owncloud"		Owncloud Search vendor "Owncloud" for product "Owncloud"				>= 8.2.0 < 8.2.9 Search vendor "Owncloud" for product "Owncloud" and version " >= 8.2.0 < 8.2.9"		-		Affected
Owncloud Search vendor "Owncloud"		Owncloud Search vendor "Owncloud" for product "Owncloud"				>= 9.0.0 < 9.0.4 Search vendor "Owncloud" for product "Owncloud" and version " >= 9.0.0 < 9.0.4"		-		Affected
Owncloud Search vendor "Owncloud"		Owncloud Search vendor "Owncloud" for product "Owncloud"				>= 9.1.0 < 9.1.2 Search vendor "Owncloud" for product "Owncloud" and version " >= 9.1.0 < 9.1.2"		-		Affected