Interception I (MetaCTF Writeup)

by Violet Owens

Step 1 : SSH into the server

First we will SSH into the server.

Step 2 : Check Tools

We will then go to the /bin directory to see what tools we have access to.

Step 3 : BusyBox is installed

BusyBox is installed which has Netcat and ifconfig (Two of my favorite tools)

Step 4 : Check IP Address

The next step is to check what IP address we have been registered and look at the adapter name.

Step 5 : Mask/Override IP Address

We are able to do a manual IP address override with ifconfig. Then we will make sure the IP mask has taken affect.

Step 6 : Ping Server for IP Change

If we try to listen for the packet it will not work because the server does know about the IP change. Therefore, we will ping 192.168.0.1 and then listen for the flag.

Step 7 : Listen for Flag

The tool I chose to listen for the packet is Netcat. I selected the commands -l to listen and -u for UDP protocol on port 8000. After four seconds you will receive the flag.

Thank you to the staff at https://metactf.com for making this event possible.

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