CVE-2024-37893

MFA bypass in oauth flow in Firefly III

Severity Score

5.9

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

Track

*SSVC

Descriptions

Firefly III is a free and open source personal finance manager. In affected versions an MFA bypass in the Firefly III OAuth flow may allow malicious users to bypass the MFA-check. This allows malicious users to use password spraying to gain access to Firefly III data using passwords stolen from other sources. As OAuth applications are easily enumerable using an incrementing id, an attacker could try sign an OAuth application up to a users profile quite easily if they have created one. The attacker would also need to know the victims username and password. This problem has been patched in Firefly III v6.1.17 and up. Users are advised to upgrade. Users unable to upgrade should Use a unique password for their Firefly III instance and store their password securely, i.e. in a password manager.

Firefly III es un administrador de finanzas personales gratuito y de código abierto. En las versiones afectadas, una omisión de MFA en el flujo OAuth del Firefly III puede permitir a usuarios malintencionados omitir la verificación de MFA. Esto permite a usuarios malintencionados utilizar la pulverización de contraseñas para obtener acceso a los datos de Firefly III utilizando contraseñas robadas de otras fuentes. Como las aplicaciones OAuth se pueden enumerar fácilmente utilizando una identificación incremental, un atacante podría intentar registrar una aplicación OAuth en el perfil de un usuario con bastante facilidad si ha creado uno. El atacante también necesitaría saber el nombre de usuario y la contraseña de la víctima. Este problema se solucionó en Firefly III v6.1.17 y versiones posteriores. Se recomienda a los usuarios que actualicen. Los usuarios que no puedan actualizar deben utilizar una contraseña única para su instancia de Firefly III y almacenarla de forma segura, es decir, en un administrador de contraseñas.

*Credits: N/A

CVSS Scores

GitHubv3.1 5.9

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

* Common Vulnerability Scoring System

SSVC

Decision:Track

Exploitation

None

Automatable

Tech. Impact

Partial

* Organization's Worst-case Scenario

Timeline

2024-06-10 CVE Reserved
2024-06-17 CVE Published
2024-06-18 EPSS Updated
2024-08-02 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-287: Improper Authentication
CWE-288: Authentication Bypass Using an Alternate Path or Channel

CAPEC

References (3)

URL	Tag	Source
https://github.com/firefly-iii/firefly-iii/security/advisories/GHSA-4gm4-c4mh-4p7w	X_refsource_confirm
https://owasp.org/www-community/attacks/Password_Spraying_Attack	X_refsource_misc
https://www.menlosecurity.com/what-is/highly-evasive-adaptive-threats-heat/mfa-bypass	X_refsource_misc

URL	Date	SRC

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
Firefly-iii Search vendor "Firefly-iii"		Firefly-iii Search vendor "Firefly-iii" for product "Firefly-iii"				< 6.1.17 Search vendor "Firefly-iii" for product "Firefly-iii" and version " < 6.1.17"		en		Affected