IETF Logo Mail Archive

[quicwg/base-drafts] Optimistic ACK in early handshake (#2192)

MikkelFJ <notifications@github.com> Sat, 15 December 2018 10:49 UTC

Return-Path: <noreply@github.com>
X-Original-To: quic-issues@ietfa.amsl.com
Delivered-To: quic-issues@ietfa.amsl.com
Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 5AB0112958B for <quic-issues@ietfa.amsl.com>; Sat, 15 Dec 2018 02:49:56 -0800 (PST)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -7.842
X-Spam-Level:
X-Spam-Status: No, score=-7.842 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIMWL_WL_HIGH=-1.46, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, HTML_IMAGE_ONLY_24=1.618, HTML_MESSAGE=0.001, MAILING_LIST_MULTI=-1, RCVD_IN_DNSWL_HI=-5, SPF_PASS=-0.001] autolearn=ham autolearn_force=no
Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=github.com
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 lndyaUT8gYtL for <quic-issues@ietfa.amsl.com>; Sat, 15 Dec 2018 02:49:55 -0800 (PST)
Received: from out-7.smtp.github.com (out-7.smtp.github.com [192.30.252.198]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 047A512872C for <quic-issues@ietf.org>; Sat, 15 Dec 2018 02:49:55 -0800 (PST)
Date: Sat, 15 Dec 2018 02:49:53 -0800
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=github.com; s=pf2014; t=1544870994; bh=fbo7elxTH66rklCdVbhk6rGe0PzPGwzALJPvcVnqPX8=; h=Date:From:Reply-To:To:Cc:Subject:List-ID:List-Archive:List-Post: List-Unsubscribe:From; b=Iat8kcATY2hVy/i3PT9LLgx4W9joPDsqFqiuPqZDMvwWLr2pQhBXKsA215MTzAs3l nrng4GsNmf/IAb5SnXYb/6oNypReE7nZpQckXBA+4RXJnhHOz1U+qzL4RLV6FNWh+t JPm7hspaVH9nmZ/e7p0PzJDWa3MF+WRr30U4YUYg=
From: MikkelFJ <notifications@github.com>
Reply-To: quicwg/base-drafts <reply+0166e4ab8672d923c29d1634ec57c9b21c4efc957333667392cf00000001182c9e5192a169ce1753c928@reply.github.com>
To: quicwg/base-drafts <base-drafts@noreply.github.com>
Cc: Subscribed <subscribed@noreply.github.com>
Message-ID: <quicwg/base-drafts/issues/2192@github.com>
Subject: [quicwg/base-drafts] Optimistic ACK in early handshake (#2192)
Mime-Version: 1.0
Content-Type: multipart/alternative; boundary="--==_mimepart_5c14dc51f2db2_49d63fe8dacd45bc783868"; charset="UTF-8"
Content-Transfer-Encoding: 7bit
Precedence: list
X-GitHub-Sender: mikkelfj
X-GitHub-Recipient: quic-issues
X-GitHub-Reason: subscribed
X-Auto-Response-Suppress: All
X-GitHub-Recipient-Address: quic-issues@ietf.org
Archived-At: <https://mailarchive.ietf.org/arch/msg/quic-issues/jCWaqLvniq-OJHrqnebgCiHVnWc>
X-BeenThere: quic-issues@ietf.org
X-Mailman-Version: 2.1.29
List-Id: Notification list for GitHub issues related to the QUIC WG <quic-issues.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/quic-issues>, <mailto:quic-issues-request@ietf.org?subject=unsubscribe>
List-Archive: <https://mailarchive.ietf.org/arch/browse/quic-issues/>
List-Post: <mailto:quic-issues@ietf.org>
List-Help: <mailto:quic-issues-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/quic-issues>, <mailto:quic-issues-request@ietf.org?subject=subscribe>
X-List-Received-Date: Sat, 15 Dec 2018 10:49:56 -0000

An endpoint might want to increase bandwidth by performing optimistic ACK's. The protection is to create gaps in the PN space. If such gaps are created in early handshake, a man on the side can inject ACKs where there are gaps causing the connection to fail.

A recommendation could be to only create gaps when this attack is no longer possible, but this would give the optimistic ACK attacker an advantage.

-- 
You are receiving this because you are subscribed to this thread.
Reply to this email directly or view it on GitHub:
https://github.com/quicwg/base-drafts/issues/2192

v2.23.0 | Report a Bug | By Email