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fragattack: use injection workarounds in all modes

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Mathy 2020-05-22 18:28:49 +00:00 committed by Mathy Vanhoef
parent 3b6e997a2e
commit a2991e3b3c
1 changed files with 17 additions and 26 deletions
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43
research/fragattack.py
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@ -786,24 +786,14 @@ class Station():
self.daemon.inject_mon(frame)
log(STATUS, "[Injected fragment] " + repr(frame))
if self.options.inject_mf_workaround and frame.FCfield & 0x4 != 0:
self.daemon.inject_mon(Dot11(addr1="ff:ff:ff:ff:ff:ff"))
log(DEBUG, "[Injected packet] Prevented bug after fragment injection")
# Stop processing actions if requested
if act.wait: break
# With ath9k_htc devices, there's a bug when injecting a frame with the
# More Fragments (MF) field *and* operating the interface in AP mode
# while the target is connected. For some reason, after injecting the
# frame, it halts the transmission of all other normal frames (this even
# includes beacons). Injecting a dummy packet like below avoid this,
# and assures packets keep being sent normally (when the last fragment
# had the MF flag set).
#
# Note: when the device is only operating in monitor mode, this does
# not seem to be a problem.
#
if self.options.inject_mf_workaround and frame != None and frame.FCfield & 0x4 != 0:
self.daemon.inject_mon(Dot11(addr1="ff:ff:ff:ff:ff:ff"))
log(STATUS, "[Injected packet] Prevented ath9k_htc bug after fragment injection")
return result
def update_keys(self):
@ -928,24 +918,25 @@ class Daemon(metaclass=abc.ABCMeta):
subprocess.call(["iw", self.nic_mon, "del"], stdout=subprocess.PIPE, stdin=subprocess.PIPE)
subprocess.check_output(["iw", self.nic_iface, "interface", "add", self.nic_mon, "type", "monitor"])
# Remember whether to need to perform a workaround.
driver = get_device_driver(self.nic_iface)
if driver == None:
log(WARNING, "Unable to detect driver of interface!")
log(WARNING, "Injecting fragments may be unreliable.")
elif driver in ["ath9k_htc", "iwlwifi"]:
options.inject_mf_workaround = True
log(STATUS, f"Detected {driver}, using injection bug workarounds")
log(WARNING, "Remember to use a modified backports and ath9k_htc firmware!")
# 2. Enable monitor mode
# 2. Remember whether to need to use injection workarounds.
driver = get_device_driver(self.nic_mon)
if driver == None:
log(WARNING, "Unable to detect driver of interface!")
log(WARNING, "Injecting fragments may be unreliable.")
elif driver in ["ath9k_htc", "iwlwifi"]:
# We use this workaround in more cases than required. See DEVICES.md for more info.
options.inject_mf_workaround = True
log(STATUS, f"Detected {driver}, using injection bug workarounds")
# 3. Enable monitor mode
set_monitor_mode(self.nic_mon)
log(STATUS, f"Using interface {self.nic_mon} to inject frames.")
if self.nic_hwsim:
set_monitor_mode(self.nic_hwsim)
# 3. Configure test interface if used
# 4. Configure test interface if used
if self.options.inject_test:
set_monitor_mode(self.options.inject_test)