Re: [keyassure] Objective: Restrictive versus Supplementary Models

Eric Rescorla <ekr@rtfm.com> Thu, 31 March 2011 05:05 UTC

Return-Path: <ekr@rtfm.com>
X-Original-To: keyassure@core3.amsl.com
Delivered-To: keyassure@core3.amsl.com
Received: from localhost (localhost [127.0.0.1]) by core3.amsl.com (Postfix) with ESMTP id 9133D3A6C05 for <keyassure@core3.amsl.com>; Wed, 30 Mar 2011 22:05:55 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -102.947
X-Spam-Level:
X-Spam-Status: No, score=-102.947 tagged_above=-999 required=5 tests=[AWL=0.030, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, RCVD_IN_DNSWL_LOW=-1, USER_IN_WHITELIST=-100]
Received: from mail.ietf.org ([64.170.98.32]) by localhost (core3.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id gjQwEwUjIrNI for <keyassure@core3.amsl.com>; Wed, 30 Mar 2011 22:05:54 -0700 (PDT)
Received: from mail-iw0-f172.google.com (mail-iw0-f172.google.com [209.85.214.172]) by core3.amsl.com (Postfix) with ESMTP id 4DC483A6BFA for <keyassure@ietf.org>; Wed, 30 Mar 2011 22:05:54 -0700 (PDT)
Received: by iwn39 with SMTP id 39so2278777iwn.31 for <keyassure@ietf.org>; Wed, 30 Mar 2011 22:07:33 -0700 (PDT)
MIME-Version: 1.0
Received: by 10.42.156.131 with SMTP id z3mr2428270icw.305.1301548053623; Wed, 30 Mar 2011 22:07:33 -0700 (PDT)
Received: by 10.42.217.2 with HTTP; Wed, 30 Mar 2011 22:07:33 -0700 (PDT)
In-Reply-To: <201103310038.p2V0cx49008399@fs4113.wdf.sap.corp>
References: <201103310026.p2V0QLQO007637@fs4113.wdf.sap.corp> <201103310038.p2V0cx49008399@fs4113.wdf.sap.corp>
Date: Thu, 31 Mar 2011 07:07:33 +0200
Message-ID: <AANLkTinxXhxisrNh0sE83jceQQjvYde-9cJ2L+qxW4uG@mail.gmail.com>
From: Eric Rescorla <ekr@rtfm.com>
To: mrex@sap.com
Content-Type: text/plain; charset=ISO-8859-1
Cc: keyassure@ietf.org
Subject: Re: [keyassure] Objective: Restrictive versus Supplementary Models
X-BeenThere: keyassure@ietf.org
X-Mailman-Version: 2.1.9
Precedence: list
List-Id: Key Assurance With DNSSEC <keyassure.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/listinfo/keyassure>, <mailto:keyassure-request@ietf.org?subject=unsubscribe>
List-Archive: <http://www.ietf.org/mail-archive/web/keyassure>
List-Post: <mailto:keyassure@ietf.org>
List-Help: <mailto:keyassure-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/keyassure>, <mailto:keyassure-request@ietf.org?subject=subscribe>
X-List-Received-Date: Thu, 31 Mar 2011 05:05:55 -0000

On Thu, Mar 31, 2011 at 2:38 AM, Martin Rex <mrex@sap.com> wrote:
> Martin Rex wrote:
>>
>> >
>> > I think this is an important consideration. However a relevant
>> > question for a 2119-level MUST seems to be whether we wish to have
>> > this data rejected if not DNSSEC signed.
>> > What's your view on that?
>>
>> I'm much less worried about false positives resulting in DoS, which
>> can be more easily achieved attacking at the network layer (IP, TCP).
>
> Actually, a DoS based on spoofing an DANE TLSA record with incorrect
> data and a long TTL into a DNS cache might turn out to be devastatingly
> effective when unsiged TLSA records are accepted.

How is this different from a spoofed A record with a long TTL?

-Ekr