Introduction
Learn how to use MAC Flooding to sniff traffic and ARP Cache Poisoning to manipulate network traffic as a MITM.
While it’s not required, ideally, you should have a general understanding of OSI Model Layer 2 (L2) network switches work, what a MAC table is, what the Address Resolution Protocol (ARP) does, and how to use Wireshark at a basic level. If you’re not comfortable with these topics, please check out the Network and Linux Fundamentals modules and Wireshark room.
Answers to the questions
What’s the network’s CIDR prefix?
How many other live hosts are there?
What’s the hostname of the first host (lowest IP address) you’ve found?
Who keeps sending packets to eve?
What type of packets are sent?
What’s the size of their data section? (bytes)
What kind of packets is Alice continuously sending to Bob?
What’s the size of their data section? (bytes)
Would you expect a different result when attacking hosts without ARP packet validation enabled? (Yay/Nay)
Which machine has an open well-known port?
What is the port number?
Can you access the content behind the service from your current position? (Nay/Yay)
Can you see any meaningful traffic to or from that port passively sniffing on you interface eth1? (Nay/Yay)
Now launch the same ARP spoofing attack as in the previous task. Can you see some interesting traffic, now? (Nay/Yay)
Who is using that service?
What’s the hostname the requests are sent to?
Which file is being requested?
What text is in the file?
Now, stop the attack (by pressing q). What is ettercap doing in order to leave its man-in-the-middle position gracefully and undo the poisoning?
Can you access the content behind that service, now, using the obtained credentials? (Nay/Yay)
What is the user.txt flag?
You should also have seen some rather questionable kind of traffic. What kind of remote access (shell) does Alice have on the server?
What commands are being executed? Answer in the order they are being executed.
