Maybe someone could explain to me or give me some extra sources about how exactly docker is translating it's ip address to host ip address on bridge network and what I can do to restore correct translation after arp-spoofing attack. I'm no iptables master so if someone have other ideas what should also check, give me hint. I've tried to add some extra iptables rules but with no effect. Picture from both wiresharks, below.Ĭhecked iptables and this rule (selected on the picture below) is translating my docker ip address to host ip address, but after the attack, this rule isn't working (pkts are not incrementing after the arp spoofing attack). Also, the weird thing is that, another container (attacker) is pinging external network with no problem (docker0 translates docker ip to host ip correctly). Before attack, when I'm pinging something from global network, the docker is translating his docker ip address to my host ip address and that's working fine, but after arpspoofing, it doesn't work correctly - host is sending packets with ip source of docker victim container (172.17.0.3). I opened 2 wiresharks on my host, one on docker0 interface one on my default wifi interface.
The MiTM attack is working because I can see this traffic on victim containers but something is blocking it. Victim's traffic is getting through attacker, but there's a problem that when victim is trying to ping there is no response. So when both images is running I'm executing ettercap(Tried with arpspoof tool too, same effect.) from attacker container with:Įttercap -T -i eth0 -M arp:remote //victim_ip/ //172.17.0.1/ I'm running the attacker container with -privileged flag, to enable using ettercap. They're both in bridged network, so the router here would be docker0 interface (default: 172.17.0.1) Victim - based on Alpine, with curl installedĪttacker - based on Ubuntu, with installed iputils-ping iproute2 curl iptables vim ettercap-text-only dsniff and tshark. That should be 1-4 iptables rules more or less. If you expect that IP address might change you.
Using the above output as an example, you could connect to your Docker host from inside of a container by using this IP address: 172.17.0.1. Everything it needs to do is a stupid NAT from the host IP address to the container IP address. There’s a couple of ways to do this, but the easiest way would be to connect over the IP address listed in your docker0 network adapter. I want to learn docker also so I've decided to do this with docker. Went to iptables to continue debugging with lsof/ncat and try to understand what the hell Docker is doing. I'm trying to create a lab environment to experiment with MiTM attacks.
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