From owner-freebsd-security@FreeBSD.ORG Sat May 3 05:25:43 2014 Return-Path: Delivered-To: freebsd-security@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [8.8.178.115]) (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id D561D99D for ; Sat, 3 May 2014 05:25:43 +0000 (UTC) Received: from hergotha.csail.mit.edu (wollman-1-pt.tunnel.tserv4.nyc4.ipv6.he.net [IPv6:2001:470:1f06:ccb::2]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 8E9AB156D for ; Sat, 3 May 2014 05:25:43 +0000 (UTC) Received: from hergotha.csail.mit.edu (localhost [127.0.0.1]) by hergotha.csail.mit.edu (8.14.7/8.14.7) with ESMTP id s435Pe38026964; Sat, 3 May 2014 01:25:40 -0400 (EDT) (envelope-from wollman@hergotha.csail.mit.edu) Received: (from wollman@localhost) by hergotha.csail.mit.edu (8.14.7/8.14.4/Submit) id s435Pe6g026961; Sat, 3 May 2014 01:25:40 -0400 (EDT) (envelope-from wollman) MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Message-ID: <21348.32212.390793.959943@hergotha.csail.mit.edu> Date: Sat, 3 May 2014 01:25:40 -0400 From: Garrett Wollman To: Ian Smith Subject: Re: FreeBSD Security Advisory FreeBSD-SA-14:08.tcp In-Reply-To: <20140503133437.R11699@sola.nimnet.asn.au> References: <3867.1399059743@server1.tristatelogic.com> <5363FA70.9040100@delphij.net> <20140503133437.R11699@sola.nimnet.asn.au> X-Mailer: VM 7.17 under 21.4 (patch 22) "Instant Classic" XEmacs Lucid X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.4.3 (hergotha.csail.mit.edu [127.0.0.1]); Sat, 03 May 2014 01:25:40 -0400 (EDT) X-Spam-Status: No, score=-1.0 required=5.0 tests=ALL_TRUSTED, HEADER_FROM_DIFFERENT_DOMAINS autolearn=disabled version=3.4.0 X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on hergotha.csail.mit.edu X-Mailman-Approved-At: Sat, 03 May 2014 12:25:48 +0000 Cc: freebsd-security@freebsd.org X-BeenThere: freebsd-security@freebsd.org X-Mailman-Version: 2.1.17 Precedence: list List-Id: "Security issues \[members-only posting\]" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 03 May 2014 05:25:43 -0000 < said: > I've always allowed frags, as per the example rulesets in rc.firewall. > I only recall seeing them on DNS responses from zen.spamhaus.org, where > I see plenty of these after a resetlog before the logging limit kicks > in. I doubt I'd be getting rid of ~90% of incoming spam without; eg: Blocking inbound fragments will definitely screw you when you try to use DNSsec. -GAWollman