CVE-2023-49792

Bruteforce protection can be bypassed with misconfigured proxy

Severity Score

9.8

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

Attend

*SSVC

Descriptions

Nextcloud Server provides data storage for Nextcloud, an open source cloud platform. In Nextcloud Server prior to versions 26.0.9 and 27.1.4; as well as Nextcloud Enterprise Server prior to versions 23.0.12.13, 24.0.12.9, 25.0.13.4, 26.0.9, and 27.1.4; when a (reverse) proxy is configured as trusted proxy the server could be tricked into reading a wrong remote address for an attacker, allowing them executing authentication attempts than intended. Nextcloud Server versions 26.0.9 and 27.1.4 and Nextcloud Enterprise Server versions 23.0.12.13, 24.0.12.9, 25.0.13.4, 26.0.9, and 27.1.4 contain a patch for this issue. No known workarounds are available.

Nextcloud Server proporciona almacenamiento de datos para Nextcloud, una plataforma en la nube de código abierto. En Nextcloud Server anteriores a las versiones 26.0.9 y 27.1.4; así como Nextcloud Enterprise Server anteriores a las versiones 23.0.12.13, 24.0.12.9, 25.0.13.4, 26.0.9 y 27.1.4; cuando un proxy (inverso) se configura como proxy confiable, se podría engañar al servidor para que lea una dirección remota incorrecta para un atacante, permitiéndole ejecutar intentos de autenticación de los previstos. Las versiones 26.0.9 y 27.1.4 de Nextcloud Server y las versiones 23.0.12.13, 24.0.12.9, 25.0.13.4, 26.0.9 y 27.1.4 de Nextcloud Enterprise Server contienen un parche para este problema. No hay workarounds disponibles.

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

Low

* Common Vulnerability Scoring System

SSVC

Decision:Attend

Exploitation

None

Automatable

Yes

Tech. Impact

Partial

* Organization's Worst-case Scenario

Timeline

2023-11-30 CVE Reserved
2023-12-22 CVE Published
2024-01-04 EPSS Updated
2024-08-27 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-307: Improper Restriction of Excessive Authentication Attempts

CAPEC

References (2)

URL	Tag	Source

URL	Date	SRC

URL	Date	SRC
https://github.com/nextcloud/server/pull/41526	2024-01-03

URL	Date	SRC
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-5j2p-q736-hw98	2024-01-03

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"				>= 23.0.0 < 23.0.12.13 Search vendor "Nextcloud" for product "Nextcloud Server" and version " >= 23.0.0 < 23.0.12.13"		enterprise		Affected
Nextcloud Search vendor "Nextcloud"		Nextcloud Server Search vendor "Nextcloud" for product "Nextcloud Server"				>= 24.0.0 < 24.0.12.9 Search vendor "Nextcloud" for product "Nextcloud Server" and version " >= 24.0.0 < 24.0.12.9"		enterprise		Affected
Nextcloud Search vendor "Nextcloud"		Nextcloud Server Search vendor "Nextcloud" for product "Nextcloud Server"				>= 25.0.0 < 25.0.13.4 Search vendor "Nextcloud" for product "Nextcloud Server" and version " >= 25.0.0 < 25.0.13.4"		enterprise		Affected
Nextcloud Search vendor "Nextcloud"		Nextcloud Server Search vendor "Nextcloud" for product "Nextcloud Server"				>= 26.0.0 < 26.0.9 Search vendor "Nextcloud" for product "Nextcloud Server" and version " >= 26.0.0 < 26.0.9"		-		Affected
Nextcloud Search vendor "Nextcloud"		Nextcloud Server Search vendor "Nextcloud" for product "Nextcloud Server"				>= 26.0.0 < 26.0.9 Search vendor "Nextcloud" for product "Nextcloud Server" and version " >= 26.0.0 < 26.0.9"		enterprise		Affected
Nextcloud Search vendor "Nextcloud"		Nextcloud Server Search vendor "Nextcloud" for product "Nextcloud Server"				>= 27.0.0 < 27.1.4 Search vendor "Nextcloud" for product "Nextcloud Server" and version " >= 27.0.0 < 27.1.4"		-		Affected
Nextcloud Search vendor "Nextcloud"		Nextcloud Server Search vendor "Nextcloud" for product "Nextcloud Server"				>= 27.0.0 < 27.1.4 Search vendor "Nextcloud" for product "Nextcloud Server" and version " >= 27.0.0 < 27.1.4"		enterprise		Affected