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Fix SMB Session Setup 3 MessageID detection

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This is a fix idea for issue https://github.com/lgandx/Responder/issues/158
Details are provided in the issue.
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Pixis 2021-05-06 09:59:19 +02:00 • committed by GitHub
commit 327319ab36
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1 changed files with 3 additions and 1 deletions
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4
servers/SMB.py
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@ -209,6 +209,7 @@ class SMB1(BaseRequestHandler): # SMB1 & SMB2 Server class, NTLMSSP
raise
pass
setup2MessageId = None
##Negotiate proto answer SMBv2.
if data[8:10] == b"\x72\x00" and re.search(b"SMB 2.\?\?\?", data):
head = SMB2Header(CreditCharge="\x00\x00",Credits="\x01\x00")
@ -230,6 +231,7 @@ class SMB1(BaseRequestHandler): # SMB1 & SMB2 Server class, NTLMSSP
data = self.request.recv(1024)
## Session Setup 2 answer SMBv2.
if data[16:18] == b"\x01\x00" and data[4:5] == b"\xfe":
setup2MessageId = GrabMessageID(data)[0:1]
head = SMB2Header(Cmd="\x01\x00", MessageId=GrabMessageID(data).decode('latin-1'), PID="\xff\xfe\x00\x00", CreditCharge=GrabCreditCharged(data).decode('latin-1'), Credits=GrabCreditRequested(data).decode('latin-1'), SessionID=GrabSessionID(data).decode('latin-1'),NTStatus="\x16\x00\x00\xc0")
t = SMB2Session1Data(NTLMSSPNtServerChallenge=NetworkRecvBufferPython2or3(Challenge))
t.calculate()
@ -238,7 +240,7 @@ class SMB1(BaseRequestHandler): # SMB1 & SMB2 Server class, NTLMSSP
self.request.send(NetworkSendBufferPython2or3(buffer1))
data = self.request.recv(1024)
## Session Setup 3 answer SMBv2.
if data[16:18] == b'\x01\x00' and GrabMessageID(data)[0:1] == b'\x02' and data[4:5] == b'\xfe':
if data[16:18] == b'\x01\x00' and setup2MessageId is not None and ord(GrabMessageID(data)[0:1]) == ord(setup2MessageId)+1 and data[4:5] == b'\xfe':
ParseSMBHash(data, self.client_address[0], Challenge)
head = SMB2Header(Cmd="\x01\x00", MessageId=GrabMessageID(data).decode('latin-1'), PID="\xff\xfe\x00\x00", CreditCharge=GrabCreditCharged(data).decode('latin-1'), Credits=GrabCreditRequested(data).decode('latin-1'), NTStatus="\x22\x00\x00\xc0", SessionID=GrabSessionID(data).decode('latin-1'))
t = SMB2Session2Data()