TCP RST attack (the cause of all that MD5-o-rama)
vijay gill
vgill at vijaygill.com
Tue Apr 20 21:37:52 UTC 2004
On Tue, Apr 20, 2004 at 02:11:02PM -0700, Dan Hollis wrote:
>
> On Tue, 20 Apr 2004, Crist Clark wrote:
> > But it has limited effectiveness for multi-hop sessions. There is the
> > appeal of a solution that does not depend of the physical layout of the
> > BGP peers.
>
> Does MD5 open the door to cpu DOS attacks on routers though? Eg can
> someone craft a DOS attack to take out the CPU on a router by forcing it
> to MD5 authenticate torrents of junk packets, using less bandwidth than
> it would take to DOS the links themselves?
Yes it does. About 5 mbit of md5 should peg a juniper at 100% according
to my friend alex. I have not verified this in the lab. I suggest
you try it out.
Also, this is why the GTSM (ttl hack) was written up ;)
/vijay
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