Re: [lisp] Restarting last call on LISP threats

Dino Farinacci <farinacci@gmail.com> Tue, 27 May 2014 23:18 UTC

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From: Dino Farinacci <farinacci@gmail.com>
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Date: Tue, 27 May 2014 16:18:37 -0700
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To: Ronald Bonica <rbonica@juniper.net>
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Cc: Roger Jorgensen <rogerj@gmail.com>, LISP mailing list list <lisp@ietf.org>
Subject: Re: [lisp] Restarting last call on LISP threats
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> Hi Paul,
> 
> The attack scenario that I envision is slightly different from the on that you describe below:
> 
> - LISP is widely deployed. Tens of thousands of XTRs are deployed world-wide. The mapping system data base contains hundreds of thousands of EID prefixes.
> - The attack stream is large
> - Each packet in the attack stream has a unique source LOC
> - All packets in the attack stream have the same destination LOC. This LOC represents the XTR under attack.
> - Each packet in the attack stream has a destination EID that will cause it to reach a valid destination (i.e., a destination that will respond). However, all packets in the attack stream don't have the same destination. The attack stream is spread out across multiple valid EID destinations to make it less detectable.
> - Each packet in the attack stream has a carefully chosen source EID. It is chosen to maximize the ratio of attack packets to map-requests.
> 
> One attack stream attacks an XTR. Multiple simultaneous attacks against multiple XTRs can DoS the mapping system, itself.
> 
> A PxTR probably won't generate this attack stream. However, an attack tool might.

Ignoring the unique source RLOC (which makes no difference in this attack because we are not doing a RPF check on the ETR), it is the same as if a PITR was encapsulating from the same set of source-EIDs to the same set of destination-EIDs you describe above.

That was his point.

So some clarifications:

(1) What does unique source LOC mean? I assume you mean each packet as a different source RLOC and that the address is not duplicated from multiple sites (i.e. is it not a private address like 192.168.1.1), or do you meawn something else?

(2) And what is carefully chosen mean? You might mean a scan of differnet source EIDs in each packet so the xTR that returns packets will get more map-cache misses? 

Dino