Re: tcp vulnerability? haven't seen anything on it here...
From: jamal <hidden>
Date: 2004-04-23 14:25:45
Also in:
lkml
Clarification: I think the latency of my earlier email introduced by probably netdev is creating a lot of "hostile" responses to me ;-> I feel like i am in hostile path here ;-> I sent that email a long time ago, seems like netdev or my ISP decided to deliver it now and reordered the delivery. This has happened to me a few times before with netdev thats why i prefer to cc people whenever i can (worst case they receive more than one message) Consider that message obsolete. I know you can create this problem via brute force as you explained in your later email (that showed up yesterday). cheers, jamal On Fri, 2004-04-23 at 10:15, alex@pilosoft.com wrote:
quoted
And for something like a huge download to just regular joe, this is more of a nuisance assuming some kiddie has access between you and the server. OTOH, long lived BGP sessions are affected assuming you are going across hostile path to your peer.Again - no hostile path necessary. Attack is brute-force and does not rely on MITM.quoted
So whats all this ado about nothing? Local media made it appear we are all about to die.Pretty much.quoted
Is anyone working on some fix?In networking world, there was a craze of enabling TCP-MD5 for BGP sessions reacting to this attack. There is alternative solution, "TTL hack", relying that most BGP sessions are between directly-connected routers, so if connection originator sets TTL to 255 and receiver verifies that TTL on incoming packet is 255, you can be reasonably certain that the packet was sent by someone directly connected to you. ;) -alex