IETF Logo Mail Archive

Re: [saag] [Cfrg] Further MD5 breaks: Creating a rogue CAcertificate

Paul Hoffman <paul.hoffman@vpnc.org> Sun, 04 January 2009 19:11 UTC

Return-Path: <saag-bounces@ietf.org>
X-Original-To: saag-archive@ietf.org
Delivered-To: ietfarch-saag-archive@core3.amsl.com
Received: from [127.0.0.1] (localhost [127.0.0.1]) by core3.amsl.com (Postfix) with ESMTP id 1B8A63A6974; Sun, 4 Jan 2009 11:11:33 -0800 (PST)
X-Original-To: saag@core3.amsl.com
Delivered-To: saag@core3.amsl.com
Received: from localhost (localhost [127.0.0.1]) by core3.amsl.com (Postfix) with ESMTP id 369AA3A6934; Sun, 4 Jan 2009 11:11:31 -0800 (PST)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -2.579
X-Spam-Level:
X-Spam-Status: No, score=-2.579 tagged_above=-999 required=5 tests=[AWL=0.020, BAYES_00=-2.599]
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 tugWycIrZqQm; Sun, 4 Jan 2009 11:11:30 -0800 (PST)
Received: from balder-227.proper.com (properopus-pt.tunnel.tserv3.fmt2.ipv6.he.net [IPv6:2001:470:1f04:392::2]) by core3.amsl.com (Postfix) with ESMTP id 23EAD3A689C; Sun, 4 Jan 2009 11:11:29 -0800 (PST)
Received: from [10.20.30.158] (dsl-63-249-108-169.cruzio.com [63.249.108.169]) (authenticated bits=0) by balder-227.proper.com (8.14.2/8.14.2) with ESMTP id n04JBA90047521 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Sun, 4 Jan 2009 12:11:11 -0700 (MST) (envelope-from paul.hoffman@vpnc.org)
Mime-Version: 1.0
Message-Id: <p06240804c586b9520715@[10.20.30.158]>
In-Reply-To: <230CAA22-D118-4F29-9DC8-32FDCD7D771E@checkpoint.com>
References: <495BA5E9.8040305@pobox.com> <495E3446.4070606@htt-consult.com> <230CAA22-D118-4F29-9DC8-32FDCD7D771E@checkpoint.com>
Date: Sun, 04 Jan 2009 11:11:09 -0800
To: Yoav Nir <ynir@checkpoint.com>
From: Paul Hoffman <paul.hoffman@vpnc.org>
Cc: ietf-pkix@imc.org, ietf-smime@imc.org, cfrg@irtf.org, saag@ietf.org
Subject: Re: [saag] [Cfrg] Further MD5 breaks: Creating a rogue CAcertificate
X-BeenThere: saag@ietf.org
X-Mailman-Version: 2.1.9
Precedence: list
List-Id: Security Area Advisory Group <saag.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/listinfo/saag>, <mailto:saag-request@ietf.org?subject=unsubscribe>
List-Archive: <http://www.ietf.org/pipermail/saag>
List-Post: <mailto:saag@ietf.org>
List-Help: <mailto:saag-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/saag>, <mailto:saag-request@ietf.org?subject=subscribe>
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: 7bit
Sender: saag-bounces@ietf.org
Errors-To: saag-bounces@ietf.org

At 9:02 AM +0200 1/4/09, Yoav Nir wrote:
>Best we can do is to get the CAs to
>
>(1) not issue MD5 certs anymore and
>(2) randomize the serial number and/or
>(3) and a random fluff extension that people are talking about

Just to repeat it one more time: #3 does not prevent the published attack.

>But still, I don't see Microsoft removing a root CA because one of their sub-CAs is issuing non-compliant certificates.

It is hard to see Microsoft removing or adding CAs. If anyone knows of a public interface (mailing list, web site, whatever) for when this happens, by all means please the world know.

>And if Microsoft don't, nobody else will. The Firefox/Opera/Safari/Chrome people don't want any sites that "only work with Explorer".

At least with respect to Firefox, I think that statement is false.

--Paul Hoffman, Director
--VPN Consortium
_______________________________________________
saag mailing list
saag@ietf.org
https://www.ietf.org/mailman/listinfo/saag

v2.23.0 | Report a Bug | By Email