North American Network Operators Group

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RE: Cisco vulnerability and dangerous filtering techniques

  • From: McBurnett, Jim
  • Date: Tue Jul 22 10:11:35 2003

Company A fired the wrong person. DDoS internally.
Company B has a Business partner that has VPN access, 
that get's infected.
Company C has a home user that uses VPN on a cable modem.
	he gets infected....

Virus writers will see this and use it... 
What better DDoS method is there than to take down
the network equipment.... 

I see this as a make or break.... If someone does not upgrade, 
well think of this as a roll-coaster.
Remember the sign?  This ride is not advised for 
people with bad backs, pregnant ladies......

This will be a long year of patches and learning experiences...


-----Original Message-----
From: [email protected] [mailto:[email protected]]
Sent: Tuesday, July 22, 2003 9:55 AM
To: Niels Bakker
Cc: [email protected]
Subject: Re: Cisco vulnerability and dangerous filtering techniques 

On Tue, 22 Jul 2003 15:40:02 +0200, Niels Bakker
<[email protected]>  said:
> * [email protected] (Adam Maloney) [Tue 22 Jul 2003, 15:33 CEST]:
> > The next worm taking advantage of the latest Windows'
> > is more or less inevitable.  Someone somewhere has to be writing it.
> > So why not include the cisco exploit in the worm payload?
> Why would a worm disable a vital component on its path to new

It's not part of the spread-the-worm code, it's part of the DDoS engine
that it
leaves behind.  If you get lucky, one of your 20K zombies is the other
of a router along with whoever you're pissed at and want to DDoS, so you
the command, and the zombie sprays 76 packets, goes to sleep for 30
sprays another 76.. lather rinse repeat.

I'm going to go out on a limb and say that at least 30% of Ciscos are
in places that would, if hit with this, have NO CLUE why their router
needs to be
power cycled every 30 mins.....