CVE-2022-36071

Recovery codes abuse in SFTPGo

Severity Score

8.1

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

SFTPGo is configurable SFTP server with optional HTTP/S, FTP/S and WebDAV support. SFTPGo WebAdmin and WebClient support login using TOTP (Time-based One Time Passwords) as a secondary authentication factor. Because TOTPs are often configured on mobile devices that can be lost, stolen or damaged, SFTPGo also supports recovery codes. These are a set of one time use codes that can be used instead of the TOTP. In SFTPGo versions from version 2.2.0 to 2.3.3 recovery codes can be generated before enabling two-factor authentication. An attacker who knows the user's password could potentially generate some recovery codes and then bypass two-factor authentication after it is enabled on the account at a later time. This issue has been fixed in version 2.3.4. Recovery codes can now only be generated after enabling two-factor authentication and are deleted after disabling it.

SFTPGo es un servidor SFTP configurable con soporte opcional HTTP/S, FTP/S y WebDAV. SFTPGo WebAdmin y WebClient admiten el inicio de sesión mediante TOTP (Time-based One Time Passwords) como factor de autenticación secundario. Debido a que los TOTPs son configurados a menudo en dispositivos móviles que pueden ser perdidos, robados o dañados, SFTPGo también soporta códigos de recuperación. Estos son un conjunto de códigos de un solo uso que pueden ser usados en lugar de la TOTP. En las versiones de SFTPGo desde la versión 2.2.0 hasta 2.3.3, los códigos de recuperación pueden generarse antes de habilitar la autenticación de dos factores. Un atacante que conozca la contraseña del usuario podría generar potencialmente algunos códigos de recuperación y luego omitir la autenticación de dos factores después de habilitarla en la cuenta en un momento posterior. Este problema ha sido corregido en versión 2.3.4. Los códigos de recuperación ahora sólo pueden generarse después de habilitar la autenticación de dos factores y sean eliminados después de deshabilitarla

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

None

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

Low

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2022-07-15 CVE Reserved
2022-09-02 CVE Published
2024-03-25 EPSS Updated
2024-08-03 CVE Updated
2024-08-03 First Exploit
---------- Exploited in Wild
---------- KEV Due Date

CWE

CWE-287: Improper Authentication
CWE-916: Use of Password Hash With Insufficient Computational Effort

CAPEC

References (2)

URL	Tag	Source
https://github.com/drakkan/sftpgo/security/advisories/GHSA-54qx-8p8w-xhg8	Mitigation

URL	Date	SRC
https://github.com/drakkan/sftpgo/issues/965	2024-08-03

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
Sftpgo Project Search vendor "Sftpgo Project"		Sftpgo Search vendor "Sftpgo Project" for product "Sftpgo"				>= 2.2.0 < 2.3.4 Search vendor "Sftpgo Project" for product "Sftpgo" and version " >= 2.2.0 < 2.3.4"		-		Affected