CVE-2023-43652

Non-MFA account takeover via using only SSH public key to login in jumpserver

Severity Score

9.1

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

JumpServer is an open source bastion host. As an unauthenticated user, it is possible to authenticate to the core API with a username and an SSH public key without needing a password or the corresponding SSH private key. An SSH public key should be considered public knowledge and should not used as an authentication secret alone. JumpServer provides an API for the KoKo component to validate user private key logins. This API does not verify the source of requests and will generate a personal authentication token. Given that public keys can be easily leaked, an attacker can exploit the leaked public key and username to authenticate, subsequently gaining access to the current user's information and authorized actions. This issue has been addressed in versions 2.28.20 and 3.7.1. Users are advised to upgrade. There are no known workarounds for this vulnerability.

JumpServer es un host de bastionado de código abierto. Como usuario no autenticado, es posible autenticarse en la API principal con un nombre de usuario y una clave pública SSH sin necesidad de una contraseña o la clave privada SSH correspondiente. Una clave pública SSH debe considerarse de conocimiento público y no debe utilizarse únicamente como secreto de autenticación. JumpServer proporciona una API para que el componente KoKo valide los inicios de sesión con clave privada del usuario. Esta API no verifica el origen de las solicitudes y generará un token de autenticación personal. Dado que las claves públicas se pueden filtrar fácilmente, un atacante puede explotar la clave pública y el nombre de usuario filtrados para autenticarse, obteniendo posteriormente acceso a la información del usuario actual y a las acciones autorizadas. Este problema se solucionó en las versiones 2.28.20 y 3.7.1. Se recomienda a los usuarios que actualicen. No se conocen workarounds para esta vulnerabilidad.

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

None

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

Low

Availability

None

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2023-09-20 CVE Reserved
2023-09-27 CVE Published
2024-08-02 CVE Updated
2024-08-02 First Exploit
2024-08-27 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date

CWE

CWE-862: Missing Authorization

CAPEC

References (1)

URL	Tag	Source

URL	Date	SRC
https://github.com/jumpserver/jumpserver/security/advisories/GHSA-fr8h-xh5x-r8g9	2024-08-02

URL	Date	SRC

URL	Date	SRC

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Fit2cloud Search vendor "Fit2cloud"		Jumpserver Search vendor "Fit2cloud" for product "Jumpserver"				>= 2.0.0 < 2.28.20 Search vendor "Fit2cloud" for product "Jumpserver" and version " >= 2.0.0 < 2.28.20"		-		Affected
Fit2cloud Search vendor "Fit2cloud"		Jumpserver Search vendor "Fit2cloud" for product "Jumpserver"				>= 3.0.0 < 3.7.1 Search vendor "Fit2cloud" for product "Jumpserver" and version " >= 3.0.0 < 3.7.1"		-		Affected