From owner-freebsd-security@freebsd.org Tue Apr 21 19:29:06 2020 Return-Path: Delivered-To: freebsd-security@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id B0B312B6989 for ; Tue, 21 Apr 2020 19:29:06 +0000 (UTC) (envelope-from eugen@grosbein.net) Received: from hz.grosbein.net (hz.grosbein.net [IPv6:2a01:4f8:c2c:26d8::2]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "hz.grosbein.net", Issuer "hz.grosbein.net" (not verified)) by mx1.freebsd.org (Postfix) with ESMTPS id 496DC63KQ2z3PKj for ; Tue, 21 Apr 2020 19:29:06 +0000 (UTC) (envelope-from eugen@grosbein.net) Received: from eg.sd.rdtc.ru (eg.sd.rdtc.ru [IPv6:2a03:3100:c:13:0:0:0:5]) by hz.grosbein.net (8.15.2/8.15.2) with ESMTPS id 03LJSo2G024422 (version=TLSv1.2 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT) for ; Tue, 21 Apr 2020 19:28:51 GMT (envelope-from eugen@grosbein.net) X-Envelope-From: eugen@grosbein.net X-Envelope-To: Received: from [10.58.0.10] (dadv@dadvw [10.58.0.10]) by eg.sd.rdtc.ru (8.15.2/8.15.2) with ESMTPS id 03LJSiww070990 (version=TLSv1.2 cipher=DHE-RSA-AES128-SHA bits=128 verify=NOT) for ; Wed, 22 Apr 2020 02:28:44 +0700 (+07) (envelope-from eugen@grosbein.net) Subject: Re: [FreeBSD-Announce] FreeBSD Security Advisory FreeBSD-SA-20:10.ipfw To: freebsd-security@freebsd.org References: <20200421165514.C676C1CB78@freefall.freebsd.org> From: Eugene Grosbein Message-ID: <54bfc0f6-be4c-349d-df87-8ba507803a04@grosbein.net> Date: Wed, 22 Apr 2020 02:28:43 +0700 User-Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:45.0) Gecko/20100101 Thunderbird/45.8.0 MIME-Version: 1.0 In-Reply-To: <20200421165514.C676C1CB78@freefall.freebsd.org> Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 8bit X-Spam-Status: No, score=0.3 required=5.0 tests=BAYES_00,LOCAL_FROM, SPF_HELO_NONE,SPF_PASS autolearn=no autolearn_force=no version=3.4.2 X-Spam-Report: * -2.3 BAYES_00 BODY: Bayes spam probability is 0 to 1% * [score: 0.0000] * 0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record * -0.0 SPF_PASS SPF: sender matches SPF record * 2.6 LOCAL_FROM From my domains X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on hz.grosbein.net X-Rspamd-Queue-Id: 496DC63KQ2z3PKj X-Spamd-Bar: ----- Authentication-Results: mx1.freebsd.org; none X-Spamd-Result: default: False [-6.00 / 15.00]; NEURAL_HAM_MEDIUM(-1.00)[-1.000,0]; NEURAL_HAM_LONG(-1.00)[-1.000,0]; REPLY(-4.00)[] X-BeenThere: freebsd-security@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Security issues \[members-only posting\]" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 21 Apr 2020 19:29:06 -0000 21.04.2020 23:55, FreeBSD Security Advisories wrote: > ============================================================================= > FreeBSD-SA-20:10.ipfw Security Advisory > The FreeBSD Project > > Topic: ipfw invalid mbuf handling [skip] > IV. Workaround > > No workaround is available. Systems not using the ipfw firewall are > not vulnerable. This is not true. The problem affects only seldom used rules matching TCP packets by list of TCP options (rules with "tcpoptions" keyword) and/or by TCP MSS size (rules with matching "tcpmss" keyword, don't mix with "tcp-setmss" action keyword). Systems not using "tcpoptions" nor "tcpmss" keywords to match TCP packets are not affected. For example, system using any of default templates (open/client/simple/closed/workstation) are not affected. Please consider re-checking this and adjusting the Advisory.