full-disclosure - (AUSCERT AA-2004.02) AUSCERT Advisory - Denial of Service Vulnerability in IEEE 802.11 Wireless Devices (fwd)

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From: exibar at thelair.com (Exibar)
Subject: (AUSCERT AA-2004.02) AUSCERT Advisory - Denial of Service Vulnerability in IEEE 802.11 Wireless Devices (fwd) 

I've seen the same thing with a 3com NIC that went bad, brought down an
entire subnet and it was plugged into a docking station that wasn't powered
up.

----- Original Message ----- 
From: "Ng, Kenneth (US)" <kenng@...g.com>
To: <Valdis.Kletnieks@...edu>; "Sean Batt" <sean@...mbs.anu.edu.au>
Cc: <full-disclosure@...ts.netsys.com>
Sent: Thursday, May 13, 2004 12:36 PM
Subject: RE: [Full-Disclosure] (AUSCERT AA-2004.02) AUSCERT Advisory -
Denial of Service Vulnerability in IEEE 802.11 Wireless Devices (fwd)


> I've been around long enough to remember having an AUI NIC that would take
> down a segment even when the NIC WAS NOT PLUGGED INTO THE PC.  Suspicion
was
> that there was a short in the transceiver that was causing massive
> reflections back into the segment.
>
> -----Original Message-----
> From: full-disclosure-admin@...ts.netsys.com
> [mailto:full-disclosure-admin@...ts.netsys.com]On Behalf Of
> Valdis.Kletnieks@...edu
> Sent: Thursday, May 13, 2004 11:21 AM
> To: Sean Batt
> Cc: full-disclosure@...ts.netsys.com
> Subject: Re: [Full-Disclosure] (AUSCERT AA-2004.02) AUSCERT Advisory -
> Denial of Service Vulnerability in IEEE 802.11 Wireless Devices (fwd)
>
>
> On Thu, 13 May 2004 15:22:19 +1000, Sean Batt <sean@...mbs.anu.edu.au>
> said:
> >
>
===========================================================================
> > AA-2004.02                     AUSCERT Advisory
> >
> >       Denial of Service Vulnerability in IEEE 802.11 Wireless Devices
> >                                 13 May 2004
> ....
> > The vulnerability is related to the medium access control (MAC)
> > function of the IEEE 802.11 protocol.  WLAN devices perform Carrier
> > Sense Multiple Access with Collision Avoidance (CSMA/CA), which
> "Protocols that work by listening for silence to know when it's OK to
> start sending will lock up if something transmits continuous non-silence".
> Am I the only person around who's been in this business long enough to
> remember
> how one jabbering transciever can take down an entire Ethernet thinwire or
> thickwire segment??
> This is right up there with the recent "Wow, RFC793 says an RST only has
> to be in the window, not right on it" TCP "hole".
>
>
>
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