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dns_spoofing's Introduction

DNS Spoofing

  • 發起時間：2021/04/10
  • 功能：
    • 攻擊內網中的任意終端，阻斷其網路流量
    • 以校內宿網實測，功效如下表：（單位為Mbps）
      攻擊者使用的的網速 受害者的上傳網速 受害者的下載網速
      未攻擊 732.70 932.34
      70 10.06 184.28
      140 0.04 8.85
      > 140 break break
  • 原理：
    • 透過raw_socket偽造DNS封包，並將封包來源設為受害者的ip位置，使DNS server回傳大量的回應封包給受害者，達成堵塞受害者網路的目的
    • 設法使攻擊者的流量放大，亦即使用攻擊者盡量少的流量，阻塞被攻擊者盡量多的流量
      • edns0：擴增UDP payload的限制，原本一個封包只允許512 bytes的payload，edns0可擴展到4096 bytes
      • type：在DNS query封包內，將回傳值的type設為any，使得DNS server回傳盡量多的資訊
      • 以上兩個做法，大約可使放大率達到十多倍
  • 使用方式：
    • 格式： 
      test:~$ sudo .dns_spoofing victim's_ip port dns_server's_ip
    • 範例：經8.8.8.8的DNS server跳轉，通過111端口攻擊ip為192.168.52.131主機 
      test:~$ sudo .dns_spoofing 192.168.52.131 111 8.8.8.8

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