Thread (27 messages) 27 messages, 12 authors, 2004-04-23

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
Keyboard shortcuts
hback out one level
jnext message in thread
kprevious message in thread
ldrill in
Escclose help / fold thread tree
?toggle this help