On Mon, Oct 26, 2020 at 06:42:21PM +0100, Toerless Eckert wrote:
> Thanks, Jared
>
> Somehow everybody tries to escape answering the question asked by giving
> their correct but orthogonal pet problem space answer. Ted correctly claims
> the protocols suck security wise, and you correctly claim that there are a
> lot more
> deployment considerations in face of risky underlays.
>
> At this point in time i am just trying to get an RFC out the door, and Bens
> security review was asking for options how to operationalize the choosen
> protocol
> to be hardened. My answer was the heuristic.
>
> If the anwer of the experts is "do not harden implementations of existing
> protocols",
> but only improve protocols or eliminate security risks from underlays, i think
> that is not a good strategy to show to implementors trying to understand how
> to best harden existing protocols, but i will happily take that guidance
> and remove the text about the suggested heuristics.
I think we often forget several things about the security aspects
of devices, like physical access == root (for example), on-link or on-network
attackers will always have an advantage available to them.
Things like mDNS are only as secure as their local link, and if an
attacker
is on-link there are risks that can be controlled for and those that can't.
We have had problems elsewhere as md5/tcp-md5 provide engouh mutual peer
authentication to be of value, but can be broken with a persistent on-link or
on-path attacker.
I was also just providing examples of other protocols (dhcp, ra) that
share the same on-link risks.
- Jared
--
Jared Mauch | pgp key available via finger from ja...@puck.nether.net
clue++; | http://puck.nether.net/~jared/ My statements are only mine.
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