Denegación de Servicio Remoto en Módems 2Wire

Resumen

Algunos módems 2wire son vulnerables a un ataque de denegación de servicio. Un usuario no autenticado puede reiniciar el dispositivo enviando una petición a la interfaz de Administración remota.

Descripción

           ========================================
               2WIRE REMOTE DENIAL OF SERVICE
         ========================================


Device:        2wire Gateway Router/Modem
Vulnerable Software:    < 5.29.52
Vulnerable Models:    1700HG
            1701HG
            1800HW
            2071
            2700HG
            2701HG-T
Release Date:     2009-09-00
Last Update:     2009-09-00
Critical:     Moderately critical
Impact:     Denial of service
        Remote router reboot
Where:        From remote
        In the remote management interface
Solution Status:    Vendor issued firmware patches
            Providers are in charge of applying the patches
Websec Advisory:    ws10-03


  BACKGROUND
=======================

The remote management interface of some 2wire modems is enabled by default.
This interface runs over SSL on port 50001 with an untrusted issuer certificate.

++Español
Algunos módems 2wire tienen la interfaz remota habilitada por default.
La interfaz utiliza SSL con un certificado invalido en el puerto 50001.


   DESCRIPTION
=======================

Some 2wire modems are vulnerable to a remote denial of service attack.
By requesting a special url from the Remote Management interface, an unathenticated
user can remotely reboot the complete device.

++
Algunos módems 2wire son vulnerables a un ataque de denegación de servicio.
Un usuario no autenticado puede reiniciar el dispositivo enviando una petición a
la interfaz de Administración remota.


  EXPLOIT / POC
=======================

 https://<remoteIP>:50001/xslt?page=%0d%0a


  WORKAROUND
=======================

Disable Remote Management in Firewall -> Advanced Settings.

++
Deshabilitar Administración remota en Cortafuegos -> Configuración avanzada


   DISCLOSURE TIMELINE
=======================

2009/09/06 - Vulnerability discovered
2009/09/08 - Vendor contacted


                  =======================

                           h k m
                        [email protected]
                    http://www.hakim.ws

                  =======================
Greets:
preth00nker, DromoroK, mr.ebola, Javier, d0ct0r_4rz0v1zp0, ch@vez, fito, HL, Xianur0, Pr@fEs0r X, Daemon.


  REFERENCES
=======================

Preth00nker's exploit (LAN) - http://www.milw0rm.com/exploits/2246
2Wire Gateways CRLF DoS (from local network) - http://secunia.com/advisories/21583
Hakim.Ws - http://www.hakim.ws
WebVuln - http://www.webvuln.com

POC

https://:50001/xslt?page=%0d%0a