[dane] SMTP STARTTLS stripping in the wild
Paul Wouters <paul@nohats.ca> Thu, 13 November 2014 19:59 UTC
Return-Path: <paul@nohats.ca>
X-Original-To: dane@ietfa.amsl.com
Delivered-To: dane@ietfa.amsl.com
Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 31D9C1ACF09 for <dane@ietfa.amsl.com>; Thu, 13 Nov 2014 11:59:08 -0800 (PST)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -2.594
X-Spam-Level:
X-Spam-Status: No, score=-2.594 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, RP_MATCHES_RCVD=-0.594] autolearn=ham
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 5a0RlmZ8jZoe for <dane@ietfa.amsl.com>; Thu, 13 Nov 2014 11:59:06 -0800 (PST)
Received: from bofh.nohats.ca (bofh.nohats.ca [76.10.157.69]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 0085C1ACE30 for <dane@ietf.org>; Thu, 13 Nov 2014 11:59:05 -0800 (PST)
Received: from bofh.nohats.ca (bofh.nohats.ca [127.0.0.1]) by bofh.nohats.ca (Postfix) with ESMTP id 2438E817C1 for <dane@ietf.org>; Thu, 13 Nov 2014 14:59:05 -0500 (EST)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=nohats.ca; s=default; t=1415908745; bh=3j0xgMnOGNJxIdT4I9KHj8c/ggouAyuFg2NsRyLFOoU=; h=Date:From:To:Subject; b=iWZf5/SlEeqlOO5GQWUj6DWfiEGSpI1r9P4y7eqKWf+oWpd+JgY3X3p/5Vo3aj7V7 3nSUxR31xMgfG1Oe7ddkwYJJKCB4mNgi56n9YaRFgc5tK4q83KqqiH8vDDkXRP0Wie +e9SIAaZKklv5+79nNNfhErE+0ehOOKZQr2FjlFY=
Received: from localhost (paul@localhost) by bofh.nohats.ca (8.14.7/8.14.7/Submit) with ESMTP id sADJx4ki026624 for <dane@ietf.org>; Thu, 13 Nov 2014 14:59:04 -0500
X-Authentication-Warning: bofh.nohats.ca: paul owned process doing -bs
Date: Thu, 13 Nov 2014 14:59:04 -0500
From: Paul Wouters <paul@nohats.ca>
To: dane WG list <dane@ietf.org>
Message-ID: <alpine.LFD.2.10.1411131457140.25815@bofh.nohats.ca>
User-Agent: Alpine 2.10 (LFD 1266 2009-07-14)
MIME-Version: 1.0
Content-Type: TEXT/PLAIN; format="flowed"; charset="UTF-8"
Content-Transfer-Encoding: 8bit
Archived-At: http://mailarchive.ietf.org/arch/msg/dane/s2bEh8WlQFinBNghCh1YOOKkAqQ
Subject: [dane] SMTP STARTTLS stripping in the wild
X-BeenThere: dane@ietf.org
X-Mailman-Version: 2.1.15
Precedence: list
List-Id: DNS-based Authentication of Named Entities <dane.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/dane>, <mailto:dane-request@ietf.org?subject=unsubscribe>
List-Archive: <http://www.ietf.org/mail-archive/web/dane/>
List-Post: <mailto:dane@ietf.org>
List-Help: <mailto:dane-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/dane>, <mailto:dane-request@ietf.org?subject=subscribe>
X-List-Received-Date: Thu, 13 Nov 2014 19:59:08 -0000
https://www.eff.org/deeplinks/2014/11/starttls-downgrade-attacks "In recent months, researchers have reported ISPs in the US and Thailand intercepting their customers' data to strip a security flag—called STARTTLS—from email traffic." Thanks to Viktor, properly configured postfix clients deployed with DANE should detect this and refuse to send the email unencrypted. Paul
- [dane] SMTP STARTTLS stripping in the wild Paul Wouters
- Re: [dane] SMTP STARTTLS stripping in the wild Viktor Dukhovni
- Re: [dane] SMTP STARTTLS stripping in the wild John Levine
- Re: [dane] SMTP STARTTLS stripping in the wild Paul Wouters
- Re: [dane] SMTP STARTTLS stripping in the wild John R Levine
- Re: [dane] SMTP STARTTLS stripping in the wild Chris Newman
- Re: [dane] SMTP STARTTLS stripping in the wild Viktor Dukhovni
- Re: [dane] SMTP STARTTLS stripping in the wild Michael Richardson
- Re: [dane] SMTP STARTTLS stripping in the wild Viktor Dukhovni