CVE-2024-38520

SoftEther VPN with L2TP - 2.75x Amplification

Severity Score

5.3

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

Track*

*SSVC

Descriptions

SoftEtherVPN is a an open-source cross-platform multi-protocol VPN Program. When SoftEtherVPN is deployed with L2TP enabled on a device, it introduces the possibility of the host being used for amplification/reflection traffic generation because it will respond to every packet with two response packets that are larger than the request packet size. These sorts of techniques are used by external actors who generate spoofed source IPs to target a destination on the internet. This vulnerability has been patched in version 5.02.5185.

SoftEtherVPN es un programa VPN multiprotocolo, multiplataforma y de código abierto. Cuando SoftEtherVPN se implementa con L2TP habilitado en un dispositivo, presenta la posibilidad de que el host se utilice para la generación de tráfico de amplificación/reflexión porque responderá a cada paquete con dos paquetes de respuesta que son más grandes que el tamaño del paquete de solicitud. Este tipo de técnicas son utilizadas por actores externos que generan IP de origen falsificadas para apuntar a un destino en Internet. Esta vulnerabilidad ha sido parcheada en la versión 5.02.5185.

*Credits: N/A

CVSS Scores

GitHubv3.1 5.3

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:Track*

Exploitation

Poc

Automatable

Tech. Impact

Partial

* Organization's Worst-case Scenario

Timeline

2024-06-18 CVE Reserved
2024-06-26 CVE Published
2024-06-27 EPSS Updated
2024-08-02 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-400: Uncontrolled Resource Consumption

CAPEC

References (3)

URL	Tag	Source
https://github.com/SoftEtherVPN/SoftEtherVPN/commit/c2a7aa548137dc80c6aafdc645cf4dc34e0dc764	X_refsource_misc
https://github.com/SoftEtherVPN/SoftEtherVPN/releases/tag/5.02.5185	X_refsource_misc
https://github.com/SoftEtherVPN/SoftEtherVPN/security/advisories/GHSA-j35p-p8pj-vqxq	X_refsource_confirm

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
SoftEtherVPN Search vendor "SoftEtherVPN"		SoftEtherVPN Search vendor "SoftEtherVPN" for product "SoftEtherVPN"				<= 5.02.5183 Search vendor "SoftEtherVPN" for product "SoftEtherVPN" and version " <= 5.02.5183"		en		Affected