Re: [TLS] Last Call: <draft-ietf-tls-downgrade-scsv-03.txt> (TLS Fallback Signaling Cipher Suite Value (SCSV) for Preventing Protocol Downgrade Attacks) to Proposed Standard

Jeffrey Walton <noloader@gmail.com> Sat, 17 January 2015 05:07 UTC

Return-Path: <noloader@gmail.com>
X-Original-To: tls@ietfa.amsl.com
Delivered-To: tls@ietfa.amsl.com
Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 63EB11B2AE8; Fri, 16 Jan 2015 21:07:48 -0800 (PST)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: 0.3
X-Spam-Level:
X-Spam-Status: No, score=0.3 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_FROM=0.001, MANGLED_BACK=2.3, SPF_PASS=-0.001] autolearn=no
Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id oQVZTFpGcwXz; Fri, 16 Jan 2015 21:07:45 -0800 (PST)
Received: from mail-ie0-x232.google.com (mail-ie0-x232.google.com [IPv6:2607:f8b0:4001:c03::232]) (using TLSv1 with cipher ECDHE-RSA-RC4-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 601BB1A9167; Fri, 16 Jan 2015 21:07:45 -0800 (PST)
Received: by mail-ie0-f178.google.com with SMTP id vy18so24119690iec.9; Fri, 16 Jan 2015 21:07:44 -0800 (PST)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:reply-to:in-reply-to:references:date:message-id :subject:from:to:cc:content-type:content-transfer-encoding; bh=bG0bpDxCLzgLfzZpuE2QT/1iWOBhoUlOnH9+7wf35Ds=; b=NdHW1xHhyHaYCS5ZZAnsBU6Ky6LiwapQv8NqFMxiaVPyfCazZD7Y3NVe7WGqGosFH8 6T8SvIGKArsrDFBc14PC9RyynrEAEwV0BpG6Bkm/afaCiKgFWF+XFROAJqVCsAE5N3ph zJOuSAyNjb7EOdenZU2GPoiLUUVBu2IM/yOXISmB2t14KzLrqmwXIGpgBGTCPwQMP461 gLz5ljEu/GReJV471BGWVftjICM0GN7UFnldtvVI/gijkJ68CKoxUayRfiBi/WEMFZZ7 1yZEB3rlC3R9FzxOcBRzY6FigNsVwEjraEfGGLJftK/EMw+uaz1aVenyVF1+Wgg4YR1w hhag==
MIME-Version: 1.0
X-Received: by 10.42.54.5 with SMTP id p5mr17949128icg.37.1421471264512; Fri, 16 Jan 2015 21:07:44 -0800 (PST)
Received: by 10.107.134.170 with HTTP; Fri, 16 Jan 2015 21:07:44 -0800 (PST)
In-Reply-To: <CADMpkcKkdhiEpJSUzsk-rEtCLhYgfMSzcFAwtVzYb96EK2hhZQ@mail.gmail.com>
References: <20150109180539.22231.7270.idtracker@ietfa.amsl.com> <20150116210327.61046788@pc> <CADMpkcKkdhiEpJSUzsk-rEtCLhYgfMSzcFAwtVzYb96EK2hhZQ@mail.gmail.com>
Date: Sat, 17 Jan 2015 00:07:44 -0500
Message-ID: <CAH8yC8k+H0P=R4nRMnf+G=B4wTjPmvGGeBvPwfiozauk+-ZxAw@mail.gmail.com>
From: Jeffrey Walton <noloader@gmail.com>
To: Bodo Moeller <bmoeller@acm.org>
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable
Archived-At: <http://mailarchive.ietf.org/arch/msg/tls/8pKJY6kmHBwEzuwJmSkblr-HVqc>
Cc: ietf@ietf.org, "tls@ietf.org" <tls@ietf.org>
Subject: Re: [TLS] Last Call: <draft-ietf-tls-downgrade-scsv-03.txt> (TLS Fallback Signaling Cipher Suite Value (SCSV) for Preventing Protocol Downgrade Attacks) to Proposed Standard
X-BeenThere: tls@ietf.org
X-Mailman-Version: 2.1.15
Precedence: list
Reply-To: noloader@gmail.com
List-Id: "This is the mailing list for the Transport Layer Security working group of the IETF." <tls.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/tls>, <mailto:tls-request@ietf.org?subject=unsubscribe>
List-Archive: <http://www.ietf.org/mail-archive/web/tls/>
List-Post: <mailto:tls@ietf.org>
List-Help: <mailto:tls-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/tls>, <mailto:tls-request@ietf.org?subject=subscribe>
X-List-Received-Date: Sat, 17 Jan 2015 05:07:49 -0000

On Fri, Jan 16, 2015 at 4:04 PM, Bodo Moeller <bmoeller@acm.org> wrote:
> Hanno Böck <hanno@hboeck.de>:
>
>> I think this adds further evidence that adding another workaround layer
>> (SCSV) is the wrong thing to do. Instead browsers should just stop
>> doing weird things with protocols that compromise security and drop
>> the protocol dance completely.
>
> Also, quite clearly, we can't yet know how the TLS 1.3 (1.4, 1.5, ...)
> rollout will work out.
>
The WG should be solving problems that do exist; and not manufactured
problems or theoretical future problems that don't exist.

Jeff