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I'm trying to learn some attack methods by myself and I have hit a wall where I can't find any information. I have successfully performed an ARP MiTM between 2 systems and I am able to sniff the traffic using tcpdump, driftnet, etc.

My question is: How can I actively modify the packets by injecting HTML code into the response (non SSL, of course)

  • I prefer Kali Linux, a few Alfa WiFi external-USB radios, and to `apt-get install mana-toolkit mitmf'. These last two tools provide a lot more than the MITM-focused tools I've seen in 2014 or earlier – atdre Mar 10 '15 at 18:13
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Ettercap has options to inject into an html stream. You could also use proxies.

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Specifically using Ettercap, you want to implement filters. You can write your own filters to identify specific types of traffic and replace it with your own data. Here is a SANS reading room paper that goes into a lot of detail about Ettercap, or you can just Google for "ettercap filters" and read up on it more.

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