NetExec/cme/modules/spooler.py

#!/usr/bin/env python3
# -*- coding: utf-8 -*-

# https://raw.githubusercontent.com/SecureAuthCorp/impacket/master/examples/rpcdump.py
from impacket.examples import logger
from impacket import uuid, version
from impacket.dcerpc.v5 import transport, epm
from impacket.dcerpc.v5.rpch import RPC_PROXY_INVALID_RPC_PORT_ERR, \
    RPC_PROXY_CONN_A1_0X6BA_ERR, RPC_PROXY_CONN_A1_404_ERR, \
    RPC_PROXY_RPC_OUT_DATA_404_ERR

KNOWN_PROTOCOLS = {
    135: {'bindstr': r'ncacn_ip_tcp:%s[135]'},
    445: {'bindstr': r'ncacn_np:%s[\pipe\epmapper]'},
    }

class CMEModule:
    '''
        For printnightmare: detect if print spooler is enabled or not. Then use @cube0x0's project https://github.com/cube0x0/CVE-2021-1675 or Mimikatz from Benjamin Delpy
        Module by @mpgn_x64

    '''
    name = 'spooler'
    description = 'Detect if print spooler is enabled or not'
    supported_protocols = ['smb']
    opsec_safe= True
    multiple_hosts = True

    def options(self, context, module_options):
        self.port = 135
        if 'PORT' in module_options:
            self.port = int(module_options['PORT'])

    def on_login(self, context, connection):

        entries = []
        lmhash = getattr(connection, "lmhash", "")
        nthash = getattr(connection, "nthash", "")

        self.__stringbinding = KNOWN_PROTOCOLS[self.port]['bindstr'] % connection.host
        logging.debug('StringBinding %s' % self.__stringbinding)
        rpctransport = transport.DCERPCTransportFactory(self.__stringbinding)
        rpctransport.set_credentials(connection.username, connection.password, connection.domain, lmhash, nthash)
        rpctransport.setRemoteHost(connection.host)
        rpctransport.set_dport(self.port)

        try:
            entries = self.__fetchList(rpctransport)
        except Exception as e:
            error_text = 'Protocol failed: %s' % e
            logging.critical(error_text)

            if RPC_PROXY_INVALID_RPC_PORT_ERR in error_text or \
                RPC_PROXY_RPC_OUT_DATA_404_ERR in error_text or \
                RPC_PROXY_CONN_A1_404_ERR in error_text or \
                RPC_PROXY_CONN_A1_0X6BA_ERR in error_text:
                logging.critical("This usually means the target does not allow "
                                "to connect to its epmapper using RpcProxy.")
                return

        # Display results.
        endpoints = {}
        # Let's groups the UUIDS
        for entry in entries:
            binding = epm.PrintStringBinding(entry['tower']['Floors'])
            tmpUUID = str(entry['tower']['Floors'][0])
            if (tmpUUID in endpoints) is not True:
                endpoints[tmpUUID] = {}
                endpoints[tmpUUID]['Bindings'] = list()
            if uuid.uuidtup_to_bin(uuid.string_to_uuidtup(tmpUUID))[:18] in epm.KNOWN_UUIDS:
                endpoints[tmpUUID]['EXE'] = epm.KNOWN_UUIDS[uuid.uuidtup_to_bin(uuid.string_to_uuidtup(tmpUUID))[:18]]
            else:
                endpoints[tmpUUID]['EXE'] = 'N/A'
            endpoints[tmpUUID]['annotation'] = entry['annotation'][:-1].decode('utf-8')
            endpoints[tmpUUID]['Bindings'].append(binding)

            if tmpUUID[:36] in epm.KNOWN_PROTOCOLS:
                endpoints[tmpUUID]['Protocol'] = epm.KNOWN_PROTOCOLS[tmpUUID[:36]]
            else:
                endpoints[tmpUUID]['Protocol'] = "N/A"
     
        for endpoint in list(endpoints.keys()):
            if "MS-RPRN" in endpoints[endpoint]['Protocol']:
                logging.debug("Protocol: %s " % endpoints[endpoint]['Protocol'])
                logging.debug("Provider: %s " % endpoints[endpoint]['EXE'])
                logging.debug("UUID    : %s %s" % (endpoint, endpoints[endpoint]['annotation']))
                logging.debug("Bindings: ")
                for binding in endpoints[endpoint]['Bindings']:
                    logging.debug("          %s" % binding)
                logging.debug("")
                context.log.highlight('Spooler service enabled')
                break

        if entries:
            num = len(entries)
            if 1 == num:
                logging.info('Received one endpoint.')
            else:
                logging.info('Received %d endpoints.' % num)
        else:
            logging.info('No endpoints found.')


    def __fetchList(self, rpctransport):
        dce = rpctransport.get_dce_rpc()
        dce.connect()
        resp = epm.hept_lookup(None, dce=dce)
        dce.disconnect()
        return resp