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detect_bluekeep.py
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#!/usr/bin/env python3
import ssl
import argparse
import sys
import traceback
import struct
import socket
import hashlib
import string
import random
import logging
import os
import sys
import concurrent.futures
from binascii import unhexlify, hexlify
from ipaddress import IPv4Network
from cryptography import x509
from cryptography.hazmat.backends import default_backend
from cryptography.hazmat.primitives.asymmetric import rsa,padding
from cryptography.hazmat.primitives import hashes
log = logging.getLogger("bluekeep")
VERSION = "0.13"
SEC_ENCRYPT = 0x08
SEC_INFO_PKT = 0x40
STATUS_VULNERABLE = "VULNERABLE"
STATUS_UNKNOWN = "UNKNOWN"
STATUS_NORDP = "NO RDP"
STATUS_SAFE = "SAFE"
NEGOTIATION_FAILURED = ["UNKNOWN_ERROR",
"SSL_REQUIRED_BY_SERVER", # 1
"SSL_NOT_ALLOWED_BY_SERVER",
"SSL_CERT_NOT_ON_SERVER",
"INCONSISTENT_FLAGS",
"HYBRID_REQUIRED_BY_SERVER", # 5
"SSL_WITH_USER_AUTH_REQUIRED_BY_SERVER"] # 6
# https://github.com/DavidBuchanan314/rc4
class RC4:
"""
This class implements the RC4 streaming cipher.
Derived from http://cypherpunks.venona.com/archive/1994/09/msg00304.html
"""
def __init__(self, key, streaming=True):
assert(isinstance(key, (bytes, bytearray)))
# key scheduling
S = list(range(0x100))
j = 0
for i in range(0x100):
j = (S[i] + key[i % len(key)] + j) & 0xff
S[i], S[j] = S[j], S[i]
self.S = S
# in streaming mode, we retain the keystream state between crypt()
# invocations
if streaming:
self.keystream = self._keystream_generator()
else:
self.keystream = None
def crypt(self, data):
"""
Encrypts/decrypts data (It's the same thing!)
"""
assert(isinstance(data, (bytes, bytearray)))
keystream = self.keystream or self._keystream_generator()
return bytes([a ^ b for a, b in zip(data, keystream)])
def _keystream_generator(self):
"""
Generator that returns the bytes of keystream
"""
S = self.S.copy()
x = y = 0
while True:
x = (x + 1) & 0xff
y = (S[x] + y) & 0xff
S[x], S[y] = S[y], S[x]
i = (S[x] + S[y]) & 0xff
yield S[i]
# https://docs.microsoft.com/en-us/openspecs/windows_protocols/ms-rdpbcgr/db6713ee-1c0e-4064-a3b3-0fac30b4037b
def pdu_connection_request(use_ssl = True):
pkt = (
b"\x03\x00" + # TPKT header
b"\x00\x2b" + # TPKT leangth
# X.224 Connection Request
b"\x26" + # length
b"\xe0" + # CR CDT
b"\x00\x00" + # DST-REF
b"\x00\x00" + # SRC-REF
b"\x00" + # CLASS OPTION = Class 0
# Cookie: mstshash=IDENTIFIER
b"\x43\x6f\x6f\x6b\x69\x65\x3a\x20\x6d\x73\x74\x73\x68\x61\x73\x68\x3d" +
''.join(random.choice(string.ascii_letters)
for i in range(5)).encode("ascii") + # "username"
b"\x0d\x0a" +
b"\x01" + # RDP_NEG_REQ
b"\x00" + # flags
b"\x08" # length
)
if not use_ssl:
pkt += b"\x00\x00\x00\x00\x00" # PROTOCOL_RDP - standard security
else:
pkt += b"\x00\x01\x00\x00\x00" # PROTOCOL_SSL - TLS security
return pkt
def rdp_connect(sock, use_ssl):
ip, port = sock.getpeername()
log.debug(f"[D] [{ip}] Verifying RDP protocol...")
res = rdp_send_recv(sock, pdu_connection_request(use_ssl))
# 0300 0013 0e d0 0000 1234 00
# 03 - response type x03 TYPE_RDP_NEG_FAILURE x02 TYPE_RDP_NEG_RSP
# 00 0800 05000000
# Issue #2: 0300 000b 06 d0 0000 1234 00
if res[0:2] == b'\x03\x00' and (res[5] & 0xf0) == 0xd0:
if len(res) < 0xc or res[0xb] == 0x2:
log.debug(f"[D] [{ip}] RDP connection accepted by the server.")
if len(res) < 0xc:
return "nossl"
else:
return None
elif res[0xb] == 0x3:
log.debug(f"[D] [{ip}] RDP connection rejected by the server.")
fc = res[0xf]
if fc > 6:
fc = 0
fcs = NEGOTIATION_FAILURED[fc]
log.debug(f"[D] [{ip}] filureCode: {fcs}")
return fcs
raise RdpCommunicationError()
def pdu_connect_initial(use_ssl):
pkt = (
#000102030405060708090A0B0C0D0E0F000102030405060708090A0B0C0D0E0F
"0300" +
"01ca" +
"02f080" +
"7f65" + # BER - Connect Initial
"8201be" + # Length
"040101" + #
"040101" + #
"0101ff" + # upwardFlag = TRUE
"3020" +
"02020022" +
"02020002" +
"02020000" +
"02020001" +
"02020000" +
"02020001" +
"0202ffff" +
"02020002" +
"3020" +
"02020001" +
"02020001" +
"02020001" +
"02020001" +
"02020000" +
"02020001" +
"02020420" +
"02020002" +
"3020" +
"0202ffff" +
"0202fc17" +
"0202ffff" +
"02020001" +
"02020000" +
"02020001" +
"0202ffff" +
"02020002" +
"0482014b" + # userData 0x4b length
"000500147c00018142000800100001c00044756361" +
"8134" +
"01c0d800" + #CS_CORE - length 0xd8
"04000800" + # RDP 5.0, 5.1, 5.2, 6.0, 6.1, 7.0, 7.1, 8.0, and 8.1 clients
# When RDP 4.0 is used it does not trigger the vulnerability detection
#"01000800" + # RDP 4.0 clients
"2003" +
"5802" +
"01ca" +
"03aa" +
"09040000" +
"280a0000" # client build
)
#000102030405060708090A0B0C0D0E0F000102030405060708090A0B0C0D0E0F
pkt += (
"7800310038003100300000000000000000000000000000000000000000000000" + # clientName
"04000000" + # keyboardType
"00000000" + # keyboardSubType
"0c000000" + # keyboardFunctionKey
"0000000000000000000000000000000000000000000000000000000000000000" +
"0000000000000000000000000000000000000000000000000000000000000000" +
"01ca" + # postBeta2ColorDepth
"0100" + # clientProductId
"00000000" +
"1800" + # highColorDepth
"0700" + # supportedColorDepths
"0100" +
"0000000000000000000000000000000000000000000000000000000000000000" +
"0000000000000000000000000000000000000000000000000000000000000000" +
"00" +
"00")
if use_ssl:
pkt += "01000000" # Server selected protocol
else:
pkt += "00000000" # Server selected protocol
pkt += (
"04c00c00" + # CS_CLUSTER
"09000000" + # CLUSTER flags
"00000000" +
"02c00c00" + # CS_SECURITY
"03000000" + # encryptionMethods
"00000000" +
"03c04400" + # CS_NET
"05000000" + # Channel count
"636c697072647200" + # cliprdr
"c0a00000" +
"4d535f5431323000" + # MS_T120
"80800000" +
"726470736e640000" + # rdpsnd
"c0000000" +
"736e646462670000" + # snddbg
"c0000000" +
"7264706472000000" + # rdpdr
"80800000")
return unhexlify(pkt)
# https://docs.microsoft.com/en-us/openspecs/windows_protocols/ms-rdpbcgr/04c60697-0d9a-4afd-a0cd-2cc133151a9c
def pdu_erect_domain_request():
pkt = (
b"\x03\x00" + # header
b"\x00\x0c" + # length
# X.224 Data TPDU (2 bytes: 0xf0 = Data TPDU, 0x80 = EOT, end of transmission)
b"\x02\xf0\x80" +
# T.125 MCS Erect Domain (PER encoding)
b"\x04\x00\x01\x00\x01")
return pkt
# https://docs.microsoft.com/en-us/openspecs/windows_protocols/ms-rdpbcgr/f5d6a541-9b36-4100-b78f-18710f39f247
def pdu_attach_user_request():
pkt = (
b"\x03\x00" + # header
b"\x00\x08" + # length
# X.224 Data TPDU (2 bytes: 0xf0 = Data TPDU, 0x80 = EOT, end of transmission)
b"\x02\xf0\x80" +
b"\x28" # PER encoded PDU contents
)
return pkt
# https://docs.microsoft.com/en-us/openspecs/windows_protocols/ms-rdpbcgr/64564639-3b2d-4d2c-ae77-1105b4cc011b
def pdu_channel_request(user1, channel_id):
log.debug(f"Channel request '{user1}' '{channel_id}'")
pkt = (
b"\x03\x00" + # header
b"\x00\x0c" + # length
b"\x02\xf0\x80" + # X.224
b"\x38" + # ChannelJoin request
# network byteorder
struct.pack('>HH', user1, channel_id)
)
return pkt
# https://docs.microsoft.com/en-us/openspecs/windows_protocols/ms-rdpbcgr/9cde84cd-5055-475a-ac8b-704db419b66f
def pdu_security_exchange(rcran, rsexp, rsmod, bitlen):
log.debug(f"Encrypting")
encrypted_rcran_bignum = rsa_encrypt(rcran, rsexp, rsmod)
log.debug(f"Encrypted {encrypted_rcran_bignum:0x}")
encrypted_rcran = int_to_bytestring(encrypted_rcran_bignum)
bitlen += 8
bitlen_hex = struct.pack("<L", bitlen)
log.debug(f"Encrypted client random: #{hexlify(encrypted_rcran)}")
userdata_length = 8 + bitlen
userdata_length_low = userdata_length & 0xFF
userdata_length_high = userdata_length >> 8
flags = 0x80 | userdata_length_high
pkt = b"\x03\x00"
pkt += struct.pack(">H", userdata_length+15) # TPKT
pkt += b"\x02\xf0\x80" # X.224
pkt += b"\x64" # sendDataRequest
pkt += b"\x00\x08" # intiator userId
pkt += b"\x03\xeb" # channelId = 1003
pkt += b"\x70" # dataPriority
pkt += struct.pack("B", flags)
pkt += struct.pack("B", userdata_length_low) # UserData length
pkt += b"\x01\x00" # securityHeader flags
pkt += b"\x00\x00" # securityHeader flagsHi
pkt += bitlen_hex # securityPkt length
pkt += encrypted_rcran # 64 bytes encrypted client random
# 8 bytes rear padding (always present)
pkt += b"\x00\x00\x00\x00\x00\x00\x00\x00"
return pkt
# https://docs.microsoft.com/en-us/openspecs/windows_protocols/ms-rdpbcgr/772d618e-b7d6-4cd0-b735-fa08af558f9d
def pdu_client_info():
pkt = (
#000102030405060708090A0B0C0D0E0F000102030405060708090A0B0C0D0E0F
"00000000" + # CodePage
"33010000" + # flags INFO_ENABLEWINDOWSKEY 0x100 | INFO_MOUSE 0x1 | INFO_DISABLECTRLALTDEL 0x2 |
# INFO_UNICODE 0x10 | INFO_MAXIMIZESHELL 0x20
"0000" + # cbDomain
"0a00" + # cbUserName
"0000" + # cbPassword
"0000" + # cbAlternateShell
"0000" + # cbWorkingDir
"0000" + # Domain
"750073006500720030000000" + # UserName
"0000" + # Password
"0000" + # AlternateShell
"0000" + # WorkingDir
"0200" + # clientAddressFamily = AF_INET (2)
"1c00" + # cbClientAddress = 0x1c = 28 bytes
"3100390032002e003100360038002e0031002e003200300038000000" + # clientAddress
"3c00" + # cbClientDir
"43003a005c00570049004e004e0054005c00530079007300740065006d003300" +
"32005c006d007300740073006300610078002e0064006c006c000000" + # clientDir
"a4010000" + # TIME_ZONE_INFORMATION::Bias
"4700540042002c0020006e006f0072006d0061006c0074006900640000000000" +
"0000000000000000000000000000000000000000000000000000000000000000" + # TIME_ZONE_INFORMATION::StandardName
"0000" + # wYear
"0a00" + # wMonth
"0000" + # wDayOfWeek
"0500" + # wDay
"0300" + # wHour
"0000" + # wMinute
"0000" + # wSecond
"0000" + # wMiliseconds
"00000000" + # TIME_ZONE_INFORMATION::StandardBias
"4700540042002c00200073006f006d006d006100720074006900640000000000" +
"0000000000000000000000000000000000000000000000000000000000000000" + # DaylightName
"0000" + # wYear ...
"0300" +
"0000" +
"0500" +
"0200" +
"0000" +
"0000" +
"0000" + # wMiliseconds
"c4ffffff" + # TIME_ZONE_INFORMATION::DaylightBias
"00000000" + # clientSessionId
"27000000" + # performanceFlags
"0000" # cbAutoReconnectCookie
)
return unhexlify(pkt)
# https://docs.microsoft.com/en-us/openspecs/windows_protocols/ms-rdpbcgr/4c3c2710-0bf0-4c54-8e69-aff40ffcde66
def pdu_client_confirm_active():
pkt = (
#000102030405060708090A0B0C0D0E0F000102030405060708090A0B0C0D0E0F
# Share Control Header
"a401" + # totalLength
"1300" + # pduType
"f103" + # pduSource
"ea030100" + # shareId
"ea03" + # originatorId
"0600" + # lengthSourceDescriptor
"8e01" + # lengthCombinedCapabilities
"4d5354534300" + # sourceDescriptor
"0e00" + # numberCapabilities
"0000" + # pad2Octets
"0100" + # capabilitySetType
"1800" + # lengthCapability
"010003000002000000000d040000000000000000" + # capabilityData
"0200" + # capabilitySetType
"1c00" + # lengthCapability
"100001000100010020035802000001000100000001000000" + #capabilityData
"0300" + # capabilitySetType
"5800" + # lengthCapability
"0000000000000000000000000000000000000000010014000000010047012a00" +
"0101010100000000010101010001010000000000010101000001010100000000" +
"a1060000000000000084030000000000e4040000" + # capabilityData
"1300" +
"2800" +
"0000000378000000780000005001000000000000000000000000000000000000" +
"00000000" +
"0800" +
"0a00" +
"010014001400" +
"0a00" +
"0800" +
"06000000" +
"0700" +
"0c00" +
"0000000000000000" +
"0500" +
"0c00" +
"0000000002000200" +
"0900" +
"0800" +
"00000000" +
"0f00" +
"0800" +
"01000000" +
"0d00" +
"5800" +
"010000000904000004000000000000000c000000000000000000000000000000" +
"0000000000000000000000000000000000000000000000000000000000000000" +
"0000000000000000000000000000000000000000" +
"0c00" +
"0800" +
"01000000" +
"0e00" +
"0800" +
"01000000" +
"1000" +
"3400" +
"fe000400fe000400fe000800fe000800fe001000fe002000fe004000fe008000" +
"fe000001400000080001000102000000")
return unhexlify(pkt)
# https://docs.microsoft.com/en-us/openspecs/windows_protocols/ms-rdpbcgr/2d122191-af10-4e36-a781-381e91c182b7
def pdu_client_persistent_key_list():
pkt = (
#000102030405060708090A0B0C0D0E0F000102030405060708090A0B0C0D0E0F
"49031700f103ea03010000013b031c0000000100000000000000000000000000" +
"0000aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa" +
"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa" +
"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa" +
"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa" +
"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa" +
"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa" +
"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa" +
"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa" +
"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa" +
"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa" +
"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa" +
"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa" +
"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa" +
"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa" +
"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa" +
"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa" +
"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa" +
"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa" +
"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa" +
"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa" +
"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa" +
"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa" +
"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa" +
"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa" +
"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa" +
"aaaaaaaaaaaaaaaaaa")
return unhexlify(pkt)
# https://docs.microsoft.com/en-us/openspecs/windows_protocols/ms-rdpbcgr/927de44c-7fe8-4206-a14f-e5517dc24b1c
def rdp_parse_serverdata(pkt, ip):
ptr = 0
rdp_pkt = pkt[0x49:] # ..pkt.length]
log.debug(f"[D] [{ip}] Parsing server data: {ptr}/{len(rdp_pkt)}")
while ptr < len(rdp_pkt):
header_type = rdp_pkt[ptr:ptr+1+1]
header_length = struct.unpack("<H", rdp_pkt[ptr+2:ptr+3+1])[0]
log.debug(f"[D] [{ip}] header: {hexlify(header_type)} len {header_length}")
if header_type == b"\x02\x0c":
log.debug(f"[D] [{ip}] security header")
encryptionMethod = struct.unpack("<L", rdp_pkt[ptr+4:ptr+8])[0]
encryptionLevel = struct.unpack("<L", rdp_pkt[ptr+8:ptr+12])[0]
serverRandomLen = struct.unpack("<L", rdp_pkt[ptr+12:ptr+16])[0]
serverCertLen = struct.unpack("<L", rdp_pkt[ptr+16:ptr+20])[0]
log.debug(f"[D] [{ip}] encryptionMethod: {encryptionMethod:02x} encryptionLevel: {encryptionLevel:02x}")
server_random = rdp_pkt[ptr+20:ptr+20+serverRandomLen]
rsran = int.from_bytes(server_random, "little")
serverCertData = rdp_pkt[ptr+20+serverRandomLen:] #ptr+20+serverRandomLen+serverCertLen]
log.debug(f"[D] [{ip}] CertChainVersion: {serverCertData[0]:02x}")
log.debug(f"[D] [{ip}] CertData: {hexlify(serverCertData)}")
if serverCertData[0] == 0x02: # magic b'0\x82\x01\x15'
log.debug(f"[D] [{ip}] Loading X.509 certificate.")
num_certs = struct.unpack("<L", serverCertData[4:8])[0]
log.debug(f"[D] [{ip}] Number of X.509 certificates: {num_certs}")
ptr = 8
while num_certs > 0:
cert_len = struct.unpack("<L", serverCertData[ptr:ptr+4])[0]
cert_data = serverCertData[ptr+4:ptr+4+cert_len]
log.debug(f"[D] [{ip}] cert #{num_certs} len: {cert_len} {hexlify(cert_data)}")
#with open(f'cert{num_certs}.crt', 'wb') as f:
# f.write(cert_data)
cert = x509.load_der_x509_certificate(cert_data, backend=default_backend())
from pyasn1_modules import pem, rfc2459,rfc4055
from pyasn1.codec.der import decoder
_cert = decoder.decode(cert_data, asn1Spec=rfc2459.Certificate())[0]
_pub_k = _cert["tbsCertificate"]["subjectPublicKeyInfo"]["subjectPublicKey"].asOctets()
_pk = decoder.decode(_pub_k, asn1Spec=rfc4055.RSAPublicKey())[0]
_mod = int(_pk['modulus'])
_exp = int(_pk['publicExponent'])
num_certs -= 1
ptr += 4 + cert_len
if _mod and _exp:
rsmod = _mod
rsexp = _exp
bitlen = _mod.bit_length() // 8
else:
log.debug(f"[D] [{ip}] Server x509 cert isn't RSA, this scenario isn't supported (yet).")
raise RdpCommunicationError()
else:
rsa_magic = rdp_pkt[ptr+68:ptr+71+1]
log.debug(f"[D] [{ip}] RSA magic: {rsa_magic}")
if rsa_magic != b"RSA1":
log.debug(f"[D] [{ip}] Server cert isn't RSA, this scenario isn't supported (yet).")
raise RdpCommunicationError()
public_exponent = rdp_pkt[ptr+84:ptr+87+1]
bitlen = struct.unpack("<L", rdp_pkt[ptr+72:ptr+75+1])[0] - 8
modulus = rdp_pkt[ptr+88:ptr+87+bitlen+1]
rsmod = int.from_bytes(modulus, "little")
rsexp = int.from_bytes(public_exponent, "little")
ptr += header_length
log.debug(f"[D] [{ip}] Parsing server data: {ptr}/{len(rdp_pkt)}")
log.debug(f"[D] [{ip}] RSA len: {bitlen} bytes {bitlen*8} bits")
log.debug(f"[D] [{ip}] SERVER_MODULUS: {rsmod:x}")
log.debug(f"[D] [{ip}] SERVER_EXPONENT: {rsexp:x}")
log.debug(f"[D] [{ip}] SERVER_RANDOM: {hexlify(server_random)}")
# log.debug(f"MODULUS = #{hexlify(modulus)} - #{rsmod.to_s}")
# log.debug(f"EXPONENT = #{hexlify(public_exponent)} - #{rsexp.to_s}")
# log.debug(f"SVRANDOM = #{hexlify(server_random)} - #{rsran.to_s}")
return rsmod, rsexp, rsran, server_random, bitlen
class RdpCommunicationError(Exception):
pass
def rdp_send(sock, data):
sock.send(data)
# sock.flush
# sleep(0.1)
# sleep(0.5)
def rdp_recv(sock):
res1 = sock.recv(4)
if res1 == b'':
raise RdpCommunicationError() # nil due to a timeout
version = res1[0]
if version == 3:
l = struct.unpack(">H", res1[2:4])[0]
else:
l = res1[1]
if l & 0x80:
l &= 0x7f
l = l * 256 + res1[2]
if l < 4:
raise RdpCommunicationError()
res2 = b''
remaining = l - 4
log.debug(f"Received: {hexlify(res1)} to_receive: {l:04x}")
while remaining:
chunk = sock.recv(remaining)
res2 += chunk
remaining -= len(chunk)
# log.debug(f"Received: {(len(res2)+4):04x}")
if res2 == b'':
raise RdpCommunicationError() # nil due to a timeout
log.debug(f"Received data: {hexlify(res1+res2)}")
return res1 + res2
def rdp_send_recv(sock, data):
rdp_send(sock, data)
return rdp_recv(sock)
def rdp_encrypted_pkt(data, rc4enckey = None, hmackey = None, flags = 0,
flagsHi=0, channelId=b"\x03\xeb"):
add_security_header = (flags & SEC_INFO_PKT) or hmackey
add_security_header1 = hmackey
userData_len = len(data)
if add_security_header:
userData_len += 4
if add_security_header1:
userData_len += 8
udl_with_flag = 0x8000 | userData_len
pkt = b"\x02\xf0\x80" # X.224
pkt += b"\x64" # sendDataRequest
pkt += b"\x00\x08" # intiator userId .. TODO: for a functional client this isn't static
pkt += channelId # channelId = 1003
pkt += b"\x70" # dataPriority
pkt += struct.pack(">H", udl_with_flag)
if add_security_header:
pkt += struct.pack("<H", flags) # {}"\x48\x00" # flags SEC_INFO_PKT | SEC_ENCRYPT
pkt += struct.pack("<H", flagsHi) # flagsHi
if add_security_header1:
pkt += rdp_hmac(hmackey, data)[0:7+1]
pkt += rdp_rc4_crypt(rc4enckey, data) if rc4enckey else data
tpkt = b"\x03\x00"
tpkt += struct.pack(">H", len(pkt) + 4)
tpkt += pkt
return tpkt
def rdp_decrypt_pkt(data, rc4deckey, ip):
# 000102030405060708090a0b0c0d0e0f1011121314151617
# 0300002202f08068000103eb701480020000ff031000070000000200000004000000
# 030001aa02f08068000103eb70819b08000000c560a0aa99ae9c07cd0e114203a53cb
# 0300000902f0802180
# 80b6fb733472f22b32a14d898a37aabd58913d001aa82451bd261
# 808323c0c394f83989eec894d7493a2577048f16e23564d084cfd
if not rc4deckey:
return
f = 0
if data[0:2] == b'\x03\x00':
t = data[0x07]
log.debug(f"[D] [{ip}] Server PDU type {t:02x} {data[0:2]}")
if t == 0x68:
if data[0x0d] & 0x80:
l = (data[0x0d] & 0x7f) * 256 + data[0x0e]
s = 0x0f
else:
l = data[0x0d]
s = 0x0e
f = struct.unpack(">H", data[s:s+2])[0]
fh = struct.unpack(">H", data[s+2:s+4])[0]
h = data[s+4:s+4+8]
enc_data = data[s+12:]
log.debug(f"[D] [{ip}] Dec: len {l} flags 0x{f:04x} hash {hexlify(h)} actlen {len(enc_data)}")
elif data[0] & 0x80: #fast-path traffic - FASTPATH_INPUT_ENCRYPTED is set
# TODO: handle FASTPATH_INPUT_SECURE_CHECKSUM
if data[1] & 0x80:
s = 11
else:
s = 10
enc_data = data[s:]
else:
return
if (data[0] & 0x80) or (f & 0x0800):
dec_data = rdp_rc4_crypt(rc4deckey, enc_data)
log.debug(f"[D] [{ip}] Cypher text lenght: {len(enc_data):04x}")
log.debug(f"[D] [{ip}] Enc: {hexlify(enc_data[:40])}")
log.debug(f"[D] [{ip}] Dec: {hexlify(dec_data[:40])}")
# if data[0] == 0x80:
# sys.exit(0)
def try_check(sock, rc4enckey, hmackey, rc4deckey, encrypt_flag):
ip, port = sock.getpeername()
try:
for i in range(5):
res = rdp_recv(sock)
rdp_decrypt_pkt(res, rc4deckey, ip)
log.debug(f"Ignoring #{hexlify(res)[:40]}")
except RdpCommunicationError as ex:
# we don't care
pass
for j in range(6):
log.debug(f"Sending challange x86 .. {j}")
# x86
pkt = rdp_encrypted_pkt(
unhexlify("100000000300000000000000020000000000000000000000"),
rc4enckey, hmackey, encrypt_flag, 0, b"\x03\xed")
rdp_send(sock, pkt)
log.debug(f"Sending challange x64 .. {j}")
# x64
pkt = rdp_encrypted_pkt(
unhexlify(
"20000000030000000000000000000000020000000000000000000000000000000000000000000000"),
rc4enckey, hmackey, encrypt_flag, 0, b"\x03\xed")
rdp_send(sock, pkt)
try:
for i in range(1):
res = rdp_recv(sock)
rdp_decrypt_pkt(res, rc4deckey, ip)
# MCS Disconnect Provider Ultimatum PDU
if unhexlify("0300000902f0802180") in res:
log.debug(f"[D] [{ip}] Received #{hexlify(res)}")
return STATUS_VULNERABLE
except socket.timeout as ex:
pass
except RdpCommunicationError as ex:
# we don't care
pass
return STATUS_SAFE
def check_rdp_vuln(ip, port, use_ssl = True):
# check if rdp is open
try:
try:
sock = tcp_connect(ip, port)
except Exception as ex:
log.debug(f"[D] [{ip}] Exception occured during TCP connect: {ex}")
return STATUS_NORDP
status = rdp_connect(sock, use_ssl)
if status in ["SSL_NOT_ALLOWED_BY_SERVER", "SSL_CERT_NOT_ON_SERVER"]:
use_ssl = False
try:
log.debug(f"[D] [{ip}] RDP reconnecting without SSL")
sock = tcp_connect(ip, port)
except Exception as ex:
log.debug(f"[D] [{ip}] Exception occured during TCP connect: {ex}")
return STATUS_NORDP
status = rdp_connect(sock, use_ssl)
if status == "nossl":
status = None
use_ssl = False
elif status:
return status
except Exception as ex:
log.debug(f"[D] [{ip}] Exception occured during RDP connect: {ex}")
return STATUS_NORDP
if use_ssl:
log.debug(f"[D] [{ip}] Starting TLS")
#context = ssl.
sock = ssl.wrap_socket(sock, ssl_version=ssl.PROTOCOL_TLSv1,
cert_reqs=ssl.CERT_NONE,)
encrypt_flag = 0
log.debug(f"[D] [{ip}] Security enabled: {sock.version()}")
else:
encrypt_flag = SEC_ENCRYPT
# send initial client data
log.debug(f"[D] [{ip}] Sending initial client data")
res = rdp_send_recv(sock, pdu_connect_initial(use_ssl))
if encrypt_flag:
rsmod, rsexp, rsran, server_rand, bitlen = rdp_parse_serverdata(res, ip)
# erect domain and attach user
log.debug(f"[D] [{ip}] Sending erect domain request")
rdp_send(sock, pdu_erect_domain_request())
log.debug(f"[D] [{ip}] Sending attach user request")
res = rdp_send_recv(sock, pdu_attach_user_request())
user1 = struct.unpack("!H", res[9: 9+2])[0]
# send channel requests
log.debug(f"[D] [{ip}] Sending channel requests")
rdp_send_recv(sock, pdu_channel_request(user1, 1009))
rdp_send_recv(sock, pdu_channel_request(user1, 1003))
rdp_send_recv(sock, pdu_channel_request(user1, 1004))
rdp_send_recv(sock, pdu_channel_request(user1, 1005))
rdp_send_recv(sock, pdu_channel_request(user1, 1006))
rdp_send_recv(sock, pdu_channel_request(user1, 1007))
rdp_send_recv(sock, pdu_channel_request(user1, 1008))
#client_rand = "\xff\xee\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xff"
if encrypt_flag:
client_rand = b"\x41" * 32
rcran = int.from_bytes(client_rand, "little")
log.debug(f"[D] [{ip}] Sending security exchange PDU")
rdp_send(sock, pdu_security_exchange(rcran, rsexp, rsmod, bitlen))
log.debug(f"[D] [{ip}] Calculating keys")
rc4encstart, rc4decstart, hmackey, sessblob = rdp_calculate_rc4_keys(
client_rand, server_rand)
log.debug(f"[D] [{ip}] RC4_ENC_KEY: #{hexlify(rc4encstart)}")
log.debug(f"[D] [{ip}] RC4_DEC_KEY: #{hexlify(rc4decstart)}")
log.debug(f"[D] [{ip}] HMAC_KEY: #{hexlify(hmackey)}")
log.debug(f"[D] [{ip}] SESS_BLOB: #{hexlify(sessblob)}")
rc4enckey = RC4(rc4encstart)
rc4deckey = RC4(rc4decstart)
else:
rc4enckey = None
rc4deckey = None
hmackey = None
log.debug(f"[D] [{ip}] Sending client info PDU")
res = rdp_send_recv(sock, rdp_encrypted_pkt(
pdu_client_info(), rc4enckey, hmackey, SEC_INFO_PKT | encrypt_flag ))
log.debug(f"[D] [{ip}] Received License packet: #{hexlify(res)}")
rdp_decrypt_pkt(res, rc4deckey, ip)
res = rdp_recv(sock)
log.debug(f"[D] [{ip}] Received Server Demand packet: #{hexlify(res)}")
rdp_decrypt_pkt(res, rc4deckey, ip)
log.debug(f"[D] [{ip}] Sending client confirm active PDU")
rdp_send(sock, rdp_encrypted_pkt(
pdu_client_confirm_active(), rc4enckey, hmackey, 0x30 | encrypt_flag))
log.debug(f"[D] [{ip}] Sending client synchronize PDU")
log.debug(f"[D] [{ip}] Sending client control cooperate PDU")
synch = rdp_encrypted_pkt(
unhexlify("16001700f103ea030100000108001f0000000100ea03"), rc4enckey, hmackey, encrypt_flag)
coop = rdp_encrypted_pkt(
unhexlify("1a001700f103ea03010000010c00140000000400000000000000"), rc4enckey, hmackey, encrypt_flag)
rdp_send(sock, synch + coop)
log.debug(f"[D] [{ip}] Sending client control request control PDU")
rdp_send(sock, rdp_encrypted_pkt(
unhexlify("1a001700f103ea03010000010c00140000000100000000000000"), rc4enckey, hmackey, encrypt_flag))
log.debug(f"[D] [{ip}] Sending client persistent key list PDU")
rdp_send(sock, rdp_encrypted_pkt(
pdu_client_persistent_key_list(), rc4enckey, hmackey, encrypt_flag))
log.debug(f"[D] [{ip}] Sending client font list PDU")
rdp_send(sock, rdp_encrypted_pkt(
unhexlify("1a001700f103ea03010000010c00270000000000000003003200"), rc4enckey, hmackey, encrypt_flag))
#log.debug("Sending base PDU")
#rdp_send(sock, rdp_encrypted_pkt(unhexlify("030000001d0002000308002004051001400a000c840000000000000000590d381001cc"), rc4enckey, hmackey))
#res = rdp_recv(sock)
# vlog.debug_good("#{hexlify(res)}")
result = try_check(sock, rc4enckey, hmackey, rc4deckey, encrypt_flag)
if result == STATUS_VULNERABLE:
# report_goods
pass
# Can't determine, but at least I know the service is running
return result
def tcp_connect(ip, port):
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.setsockopt(socket.SOL_TCP, socket.TCP_NODELAY, 1)
s.settimeout(5.0)
s.connect((ip, port))
return s
def check_host(ip, port=3389, use_ssl = True):
status = STATUS_UNKNOWN
try:
try:
status = check_rdp_vuln(ip, port, use_ssl)
except Exception as ex:
raise ex
except Exception as ex:
log.debug(f"[D] [{ip}] Exception: {ex}")
return ip, status
# https://docs.microsoft.com/en-us/openspecs/windows_protocols/ms-rdpbcgr/7c61b54e-f6cd-4819-a59a-daf200f6bf94
# mac_salt_key = "W\x13\xc58\x7f\xeb\xa9\x10*\x1e\xddV\x96\x8b[d"
# data_content = "\x12\x00\x17\x00\xef\x03\xea\x03\x02\x00\x00\x01\x04\x00$\x00\x00\x00"
# hmac = rdp_hmac(mac_salt_key, data_content) # == hexlified: "22d5aeb486994a0c785dc929a2855923"
def rdp_hmac(mac_salt_key, data_content):
sha1 = hashlib.sha1()
md5 = hashlib.md5()
pad1 = b"\x36" * 40
pad2 = b"\x5c" * 48
sha1.update(mac_salt_key)
sha1.update(pad1)
sha1.update(struct.pack("<L", len(data_content)))
sha1.update(data_content)
md5.update(mac_salt_key)
md5.update(pad2)
md5.update(sha1.digest())
return md5.digest()
# https://docs.microsoft.com/en-us/openspecs/windows_protocols/ms-rdpbcgr/705f9542-b0e3-48be-b9a5-cf2ee582607f
# SaltedHash(S, I) = MD5(S + SHA(I + S + ClientRandom + ServerRandom))
def rdp_salted_hash(s_bytes, i_bytes, clientRandom_bytes, serverRandom_bytes):
sha1 = hashlib.sha1()
md5 = hashlib.md5()
sha1.update(i_bytes)
sha1.update(s_bytes)
sha1.update(clientRandom_bytes)
sha1.update(serverRandom_bytes)
md5.update(s_bytes)
md5.update(sha1.digest())
return md5.digest()
# FinalHash(K) = MD5(K + ClientRandom + ServerRandom)
def rdp_final_hash(k, clientRandom_bytes, serverRandom_bytes):
md5 = hashlib.md5()
md5.update(k)
md5.update(clientRandom_bytes)
md5.update(serverRandom_bytes)
return md5.digest()
def rdp_calculate_rc4_keys(client_random, server_random):
# preMasterSecret = First192Bits(ClientRandom) + First192Bits(ServerRandom)
preMasterSecret = client_random[0:23+1] + server_random[0:23+1]
# PreMasterHash(I) = SaltedHash(preMasterSecret, I)
# MasterSecret = PreMasterHash(0x41) + PreMasterHash(0x4242) + PreMasterHash(0x434343)
masterSecret = rdp_salted_hash(preMasterSecret, b"A", client_random, server_random) + rdp_salted_hash(
preMasterSecret, b"BB", client_random, server_random) + rdp_salted_hash(preMasterSecret, b"CCC", client_random, server_random)
# MasterHash(I) = SaltedHash(MasterSecret, I)
# SessionKeyBlob = MasterHash(0x58) + MasterHash(0x5959) + MasterHash(0x5A5A5A)
sessionKeyBlob = rdp_salted_hash(masterSecret, b"X", client_random, server_random) + rdp_salted_hash(
masterSecret, b"YY", client_random, server_random) + rdp_salted_hash(masterSecret, b"ZZZ", client_random, server_random)
# InitialClientDecryptKey128 = FinalHash(Second128Bits(SessionKeyBlob))
initialClientDecryptKey128 = rdp_final_hash(
sessionKeyBlob[16:31+1], client_random, server_random)
# InitialClientEncryptKey128 = FinalHash(Third128Bits(SessionKeyBlob))
initialClientEncryptKey128 = rdp_final_hash(
sessionKeyBlob[32:47+1], client_random, server_random)
macKey = sessionKeyBlob[0:15+1]
log.debug(f"PreMasterSecret = #{hexlify(preMasterSecret)}")
log.debug(f"MasterSecret = #{hexlify(masterSecret)}")
log.debug(f"sessionKeyBlob = #{hexlify(sessionKeyBlob)}")
log.debug(f"macKey = #{hexlify(macKey)}")
log.debug(f"initialClientDecryptKey128 = #{hexlify(initialClientDecryptKey128)}")
log.debug(f"initialClientEncryptKey128 = #{hexlify(initialClientEncryptKey128)}")
return initialClientEncryptKey128, initialClientDecryptKey128, macKey, sessionKeyBlob
def rsa_encrypt(bignum, rsexp, rsmod):
return pow(bignum, rsexp, rsmod)
def rdp_rc4_crypt(rc4obj, data):
return rc4obj.crypt(data)
def int_to_bytestring(daInt):
return daInt.to_bytes((daInt.bit_length() + 7) // 8, byteorder='little')
def configure_logging(enable_debug, logfile):
if enable_debug:
log.setLevel(logging.DEBUG)
else:
log.setLevel(logging.INFO)
if logfile:
# create file handler
fh = logging.FileHandler(logfile)
fh.setLevel(logging.DEBUG)
# create formatter and add it to the handlers
formatter = logging.Formatter(
"%(asctime)s - %(process)d - %(name)s - %(levelname)s - %(message)r"
)
fh.setFormatter(formatter)
log.addHandler(fh)
# create console handler
ch = logging.StreamHandler()
ch.setLevel(logging.DEBUG)
formatter = logging.Formatter(
"%(asctime)s %(message)r"
)
ch.setFormatter(formatter)
log.addHandler(ch)