North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: TCP RST attack (the cause of all that MD5-o-rama)
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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