CVE-2021-37624
FreeSWITCH does not authenticate SIP MESSAGE requests, leading to spam and message spoofing
Severity Score
Exploit Likelihood
Affected Versions
Public Exploits
2Exploited in Wild
-Decision
Descriptions
FreeSWITCH is a Software Defined Telecom Stack enabling the digital transformation from proprietary telecom switches to a software implementation that runs on any commodity hardware. Prior to version 1.10.7, FreeSWITCH does not authenticate SIP MESSAGE requests, leading to spam and message spoofing. By default, SIP requests of the type MESSAGE (RFC 3428) are not authenticated in the affected versions of FreeSWITCH. MESSAGE requests are relayed to SIP user agents registered with the FreeSWITCH server without requiring any authentication. Although this behaviour can be changed by setting the `auth-messages` parameter to `true`, it is not the default setting. Abuse of this security issue allows attackers to send SIP MESSAGE messages to any SIP user agent that is registered with the server without requiring authentication. Additionally, since no authentication is required, chat messages can be spoofed to appear to come from trusted entities. Therefore, abuse can lead to spam and enable social engineering, phishing and similar attacks. This issue is patched in version 1.10.7. Maintainers recommend that this SIP message type is authenticated by default so that FreeSWITCH administrators do not need to be explicitly set the `auth-messages` parameter. When following such a recommendation, a new parameter can be introduced to explicitly disable authentication.
FreeSWITCH es una pila de telecomunicaciones definida por software que permite la transformación digital de los switches de telecomunicaciones propietarios a una implementación de software que se ejecuta en cualquier hardware básico. Las versiones anteriores a 1.10.7, FreeSWITCH no autenticaba las peticiones SIP MESSAGE, conllevando a spam y falsificación de mensajes. Por defecto, las peticiones SIP del tipo MESSAGE (RFC 3428) no son autenticadas en las versiones afectadas de FreeSWITCH. Las peticiones MESSAGE se retransmiten a los agentes de usuario SIP registrados en el servidor FreeSWITCH sin requerir ninguna autenticación. Aunque este comportamiento puede ser cambiado estableciendo el parámetro "auth-messages" a "true", no es la configuración predeterminada. El abuso de este problema de seguridad permite a atacantes enviar mensajes SIP MESSAGE a cualquier agente de usuario SIP que esté registrado en el servidor sin requerir autenticación. Además, como no es requerida autenticación, los mensajes de chat pueden ser falsificados para que parezcan proceder de entidades confiables. Por lo tanto, el abuso puede conllevar a spam y permitir la ingeniería social, el phishing y ataques similares. Este problema está parcheado en la versión 1.10.7. Los mantenedores recomiendan que este tipo de mensaje SIP sea autenticado por defecto para que los administradores de FreeSWITCH no necesiten establecer explícitamente el parámetro "auth-messages". Cuando se siga esta recomendación, es posible introducir un nuevo parámetro para deshabilitar explícitamente la autenticación
FreeSWITCH versions 1.10.6 and below fails to authenticate SIP MESSAGE requests, leading to spam and message spoofing vulnerabilities.
CVSS Scores
SSVC
- Decision:-
Timeline
- 2021-07-29 CVE Reserved
- 2021-10-25 CVE Published
- 2024-05-31 EPSS Updated
- 2024-08-04 CVE Updated
- 2024-08-04 First Exploit
- ---------- Exploited in Wild
- ---------- KEV Due Date
CWE
- CWE-287: Improper Authentication
- CWE-306: Missing Authentication for Critical Function
CAPEC
References (5)
| URL | Tag | Source |
|---|---|---|
| http://www.openwall.com/lists/oss-security/2021/10/25/6 | Mailing List |
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| https://github.com/signalwire/freeswitch/releases/tag/v1.10.7 | Third Party Advisory | |
| https://github.com/signalwire/freeswitch/security/advisories/GHSA-mjcm-q9h8-9xv3 | Third Party Advisory |
| URL | Date | SRC |
|---|---|---|
| http://packetstormsecurity.com/files/164628/FreeSWITCH-1.10.6-Missing-SIP-MESSAGE-Authentication.html | 2024-08-04 | |
| http://seclists.org/fulldisclosure/2021/Oct/44 | 2024-08-04 |
| URL | Date | SRC |
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| URL | Date | SRC |
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Affected Vendors, Products, and Versions
| Vendor | Product | Version | Other | Status | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Vendor | Product | Version | Other | Status | <-- --> | Vendor | Product | Version | Other | Status |
| Freeswitch Search vendor "Freeswitch" | Freeswitch Search vendor "Freeswitch" for product "Freeswitch" | < 1.10.7 Search vendor "Freeswitch" for product "Freeswitch" and version " < 1.10.7" | - |
Affected
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