Python Ethical Hacking - MAC Address & How to Change(1)

MAC ADDRESS

• Media Access Control
  • Permanent
  • Physical
  • Unique
• Assigned by manufacturer

WHY CHANGE THE MAC ADDRESS

1.Increase anonymity

2.Impersonate other devices

3.Bypass filters

Change the MAC Address manually.

ifconfig

ifconfig eth0 down

ifconfig eth0 hw ether :::::

ifconfig eth0 up

ifconfig

MAC_CHANGER USING A PYTHON MODULE TO EXECUTE SYSTEM COMMANDS

• The subprocess module contains a number of functions.
• These functions allow us to execute system commands.
• Commands depend on the OS which executes the script.

Refer to the Python Documentation: https://docs.python.org/3/library/subprocess.html

Simple sample:

#!/usr/bin/env python

import subprocess

subprocess.call("ifconfig", shell=True)

The Python script to change the MAC Address:

#!/usr/bin/env python

import subprocess

subprocess.call("ifconfig eth0 down", shell=True)
subprocess.call("ifconfig eth0 hw ether 00:11:22:33:44:66", shell=True)
subprocess.call("ifconfig eth0 up", shell=True)

It works.

The updated Python script to change the MAC address using variables.

#!/usr/bin/env python

import subprocess

interface = "eth0"
new_mac = "00:11:22:33:44:77"

print("[+] Changing MAC address for " + interface + " to " + new_mac)

subprocess.call("ifconfig " + interface + " down", shell=True)
subprocess.call("ifconfig " + interface + " hw ether " + new_mac, shell=True)
subprocess.call("ifconfig " + interface + " up", shell=True)

Run the script successfully.

The updated Python script using the user's input.

#!/usr/bin/env python

import subprocess

interface = input("interface > ")
new_mac = input("new MAC > ")

print("[+] Changing MAC address for " + interface + " to " + new_mac)

subprocess.call("ifconfig " + interface + " down", shell=True)
subprocess.call("ifconfig " + interface + " hw ether " + new_mac, shell=True)
subprocess.call("ifconfig " + interface + " up", shell=True)

Run the new scripts successfully.

Enhance the security of the Python script by changing the use of the call function.

#!/usr/bin/env python

import subprocess

interface = raw_input("interface > ")
new_mac = raw_input("new MAC > ")

print("[+] Changing MAC address for " + interface + " to " + new_mac)

subprocess.call(["ifconfig", interface, "down"])
subprocess.call(["ifconfig", interface, "hw", "ether", new_mac])
subprocess.call(["ifconfig", interface, "up"])

Run the script successfully and more secure.

Update the Python script to handle command-line arguments.

Use the module Parser: https://docs.python.org/2/library/optparse.html

#!/usr/bin/env python

import subprocess
import optparse

parser = optparse.OptionParser()

parser.add_option("-i", "--interface", dest="interface", help="Interface to change its MAC address")

parser.parse_args()

interface = raw_input("interface > ")
new_mac = raw_input("new MAC > ")

print("[+] Changing MAC address for " + interface + " to " + new_mac)

subprocess.call(["ifconfig", interface, "down"])
subprocess.call(["ifconfig", interface, "hw", "ether", new_mac])
subprocess.call(["ifconfig", interface, "up"])

Initializing the variables based on the command arguments.

#!/usr/bin/env python

import subprocess
import optparse

parser = optparse.OptionParser()

parser.add_option("-i", "--interface", dest="interface", help="Interface to change its MAC address")
parser.add_option("-m", "--mac", dest="new_mac", help="New MAC address")

(options, arguments) = parser.parse_args()

interface = options.interface
new_mac = options.new_mac

print("[+] Changing MAC address for " + interface + " to " + new_mac)

subprocess.call(["ifconfig", interface, "down"])
subprocess.call(["ifconfig", interface, "hw", "ether", new_mac])
subprocess.call(["ifconfig", interface, "up"])

Execute the following commands.

python mac_changer.py --interface eth0 --mac :::::

or 

python mac_changer.py -i eth0 -m :::::