$$ Red40 $$

• The VM needed for this challenge can be downloaded here.
  • The unzip password is: RED39
• You’ll need Kali Linux.

Lab Objectives:

• Exploit an XXE condition on the target VM to find the flag
• The flag is of the form Flag-SOMEVALUE

First Steps:

• You will not have the login credentials to the machine.

• Before you power it on, go to the machine settings and give the network adapter a custom MAC address.

  • This way you will be able to locate it with the arp-scan utility within Kali.
  • Don’t use the MAC address I have below. Everyone in the class needs something different.
    • Manually randomize the MAC Address you give your machine!

  

Once you have started the CTF machine, launch a root shell in Kali and do the following:

• use the *arp-scan* utility to scan the entire subnet and report back on MAC addresses that are present.
  • Your Kali Linux machine must be on the same subnet as the CTF machine.
• Use grep to filter for the MAC address that you gave the CTF Machine.
• NOTE: I only grep for the OUI of the MAC address. You should grep for the entire MAC Address!
  • Use all 6 Hex characters in your grep

An initial NMAP scan shows that we have a website on port 80.

nmap -sC -sV IP_OF_TARGET_VM

The front page looks like this.

• We’ll start by looking into the ‘approved notes’ link.