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MITM-VM

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Written by Kelby Ludwig (@kelbyludwig)

Description

This is an easy-to-deploy virtual machine that can provide flexible man-in-the-middle capabilities. This project will require little configuration, require little additional hardware, and provide many utilites and tools to accomplish common (and not so common) man-in-the-middle scenarios.

Setup

Virtual Machine Setup

Note: Almost all of the documentation assumes you are using a Macbook and OS X. Setup is possible via Linux distros but has not been documented. Furthermore, you will need two physical connections to the Internet (e.g. one wired, one wireless) for MitM-VM to route traffic properly.

git clone https://github.com/praetorian-inc/mitm-vm.git

cd mitm-vm

vagrant up

When prompted, select the interface that will be the gateway interface. In other words, the "gateway interface" is the interface that will connect the virtual machine to the Internet. For example, in use case 1 (see below) you want to act as a proxy for a device that connects to a WiFi network. You will want to configure your Macbook to share its connection to the Internet (over Ethernet) to the target device over WiFi. In this scenario, the "gateway interface" is the Ethernet interface.

You will need to install VirutalBox Extensions for your version of VirtualBox.

If you do not plan on using trudy (Which this box was built for!) then remove the iptables commands for trudy from route.sh.

Host Setup

This is dependent on the use case. The following use-cases should cover most situations.

Use Case 1: The device you want to man-in-the-middle connects to the Internet over Wi-Fi.

  1. I have made a diagram for this use case. Check it out under the diagrams folder if anything seems unclear.

  2. Update the INTERNET_ROUTER_IP environment variable in route.sh to match the IP address of your gateway interface router.

  3. Spin-up the mitm-vm using vagrant up. During initializiation you will be prompted to select an interface for bridging in the vm. Select the interface that will go from the virtual machine to the Internet. In this use-case, it will be your Ethernet interface.

  4. Route all traffic on your Macbook through the VM.

    • This can be done via your Network System Preferences in OS X. System Preferences → Network → Ethernet → Configure IPv4 → Manually → Set Static IP to a valid static IP, set the subnet to 0.0.0.0, and set Router to the ip address of the mitm-vm.

  5. Confirm that you have Internet access on the host, and that traffic is routing through the VM.

  6. Turn your Macbook into a Wireless Access Point

  7. Confirm that the device you want to mitm can access the internet. I typically test this by pinging 8.8.8.8 on my host. If I actually get a response, I will check that it is filtering through the VM. To confirm this, run tcpdump on the VM (make sure you specify the correct interface!).

  8. Run vagrant ssh to get on the mitm-vm and do all your sniffing/modifying/etc.

Use Case 2: The device you want to man-in-the-middle connects to the Internet over Ethernet.

  1. This is roughly the same setup as use case 1. The primary difference is how you share your Macbook's Internet (Step 2 - 4). Instead of sharing Ethernet connectivity over WiFi, you would share WiFi over Ethernet.

Use Case 3: You want to sniff / proxy bluetooth using OS X's built-in hardware.

  1. Install the VirtualBox Extension Pack. You need the most recent version of VirtualBox to do this (don't trust the "Check For Updates" mechanism in VirtualBox).

  2. Add a USB filter for the OS X bluetooth device. VirtualBox -> Mitmvm -> Settings -> Ports -> USB -> Little USB with a "+".

  3. Before booting the vm, you will need to convince OS X to relinquish control of the bluetooth hardware. I have provided scripts to automate disabled and re-enabled host control of the bluetooth hardware (bt-down.sh and bt-up.sh). Run bt-down as sudo. This will create a file of the modules that were disabled. Re-enabling the modules needs this file so please don't delete it.

  4. Boot the vagrant vm. Test that you have access to the bluetooth module by running hcitool dev. You should see a device! This same utility can be used to sniff and attach to devices.

  5. For bluetooth mitm please refer to btproxy's documentation.

Use Case 4: You want to sniff / modify Zigbee traffic using a peripheral Zigbee USB device.

  1. Follow the steps for the bluetooth use case.

Includes the following tools