From owner-freebsd-security@freebsd.org Thu Dec 10 14:53:07 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 327B64ADC32 for ; Thu, 10 Dec 2020 14:53:07 +0000 (UTC) (envelope-from markjdb@gmail.com) Received: from mail-qt1-x835.google.com (mail-qt1-x835.google.com [IPv6:2607:f8b0:4864:20::835]) (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (2048 bits) client-digest SHA256) (Client CN "smtp.gmail.com", Issuer "GTS CA 1O1" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4CsH361jLBz4YQ4; Thu, 10 Dec 2020 14:53:06 +0000 (UTC) (envelope-from markjdb@gmail.com) Received: by mail-qt1-x835.google.com with SMTP id u21so3779078qtw.11; Thu, 10 Dec 2020 06:53:06 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=sender:date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to; bh=3EPMiSVX9AJXw85b+fcU3toDseGTJegxIwtRQm1Yomg=; b=Tt/tVfwak65vsFBPBjYumrc7L26YRRCXN2j7luwmvtw2ZXwDJK8wYgskgZFdJEx4Kx IrVnKipNdAdNvFn6MWVtQU0yeCu1+DToE34rClID5o5K57HQdpTaAaiGFMuZ4/iIScII H4iajXNK6amejC1BUg6sgJhCD+yzCweUQ223WqG/BfrCrEDT/Bj+sxsIazl3h+wZyLsn r6Itz4ie7uXYGO58CYAsvLvyQB+K9XglkafS524BKmoGFnONjWhE+j1rf0ibAkKeRU/e 4GFtLWRr3LdIXbSIO8T1UZA7xsigMKo1jlDTr1vvRlP6fSu+fwpbq+6NU7/OBbOrOcGh 5bCQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:date:from:to:cc:subject:message-id :references:mime-version:content-disposition:in-reply-to; bh=3EPMiSVX9AJXw85b+fcU3toDseGTJegxIwtRQm1Yomg=; b=a/cMRSsGuItAJcPcqtyrQSHbZPBLOSomQKlq8SJpaeWcnoBHzwdSZEI0xTf0Vt8LoF FNSPqZl0VBlV82+aWVNAbpX9c1rDe+bzp7NGw4LEwfQYCV5NPZnx6NiZwsZhcSP+j8Wl zrtOLywNewjgjCdqmaOCDQZuocAa3NcPdZX6zyZ47+G0mmq4ybuEtgrr90wO09nIWX9K unIhmjJSepF1HwI3ug2M+Dp/dTxVUAB/B+w5411CkhycIz1P5pNpc9uFMZ3qX0+dGQ3Q 5y2zKqIw1EHZAFmv+nZesWv+qi/ekLSdy5x2qTRyVg6oD5Xe9y5pSRDtKqOKFv+kiksQ QNUw== X-Gm-Message-State: AOAM533rg1C5WNJslCC9S4W6BvgEcXTQoGObGEWkx4qfx1hzn2z5LRhh yl3h1o8eLWuYiQaRiz9Ju+zjbHK6usI= X-Google-Smtp-Source: ABdhPJxtcpkoU9ZybYs2jxeuuHxEjndqw5cfDxDQKgs1zdsS89cYz9PmI8XJIUBWVl5vuaS80UUTKg== X-Received: by 2002:ac8:53c2:: with SMTP id c2mr9744363qtq.245.1607611985341; Thu, 10 Dec 2020 06:53:05 -0800 (PST) Received: from raichu ([142.126.164.150]) by smtp.gmail.com with ESMTPSA id b3sm3662648qkf.74.2020.12.10.06.53.04 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 10 Dec 2020 06:53:04 -0800 (PST) Sender: Mark Johnston Date: Thu, 10 Dec 2020 09:53:02 -0500 From: Mark Johnston To: "Wall, Stephen" Cc: FreeBSD Security Advisories , "freebsd-security@freebsd.org" Subject: Re: FreeBSD Security Advisory FreeBSD-SA-20:31.icmp6 Message-ID: References: <20201201204619.F3A3B19D2F@freefall.freebsd.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Rspamd-Queue-Id: 4CsH361jLBz4YQ4 X-Spamd-Bar: -- Authentication-Results: mx1.freebsd.org; dkim=pass header.d=gmail.com header.s=20161025 header.b=Tt/tVfwa; dmarc=none; spf=pass (mx1.freebsd.org: domain of markjdb@gmail.com designates 2607:f8b0:4864:20::835 as permitted sender) smtp.mailfrom=markjdb@gmail.com X-Spamd-Result: default: False [-2.70 / 15.00]; TO_DN_EQ_ADDR_SOME(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; TO_DN_SOME(0.00)[]; R_SPF_ALLOW(-0.20)[+ip6:2607:f8b0:4000::/36:c]; RCVD_COUNT_THREE(0.00)[3]; DKIM_TRACE(0.00)[gmail.com:+]; NEURAL_HAM_SHORT(-1.00)[-1.000]; FORGED_SENDER(0.30)[markj@freebsd.org,markjdb@gmail.com]; MIME_TRACE(0.00)[0:+]; RBL_DBL_DONT_QUERY_IPS(0.00)[2607:f8b0:4864:20::835:from]; FREEMAIL_ENVFROM(0.00)[gmail.com]; ASN(0.00)[asn:15169, ipnet:2607:f8b0::/32, country:US]; FROM_NEQ_ENVFROM(0.00)[markj@freebsd.org,markjdb@gmail.com]; ARC_NA(0.00)[]; NEURAL_HAM_MEDIUM(-1.00)[-1.000]; R_DKIM_ALLOW(-0.20)[gmail.com:s=20161025]; FROM_HAS_DN(0.00)[]; RCPT_COUNT_THREE(0.00)[3]; NEURAL_HAM_LONG(-1.00)[-1.000]; MIME_GOOD(-0.10)[text/plain]; DMARC_NA(0.00)[freebsd.org]; SPAMHAUS_ZRD(0.00)[2607:f8b0:4864:20::835:from:127.0.2.255]; TO_MATCH_ENVRCPT_SOME(0.00)[]; RCVD_IN_DNSWL_NONE(0.00)[2607:f8b0:4864:20::835:from]; MID_RHS_NOT_FQDN(0.50)[]; RCVD_TLS_ALL(0.00)[]; MAILMAN_DEST(0.00)[freebsd-security] X-BeenThere: freebsd-security@freebsd.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: "Security issues \[members-only posting\]" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 10 Dec 2020 14:53:07 -0000 On Wed, Dec 09, 2020 at 03:45:13PM +0000, Wall, Stephen wrote: > This advisory states "Systems with IPv6 disabled are not affected." What constitutes disabling IPv6 in this context? Would it require disabling it when building the kernel, or is `ipv6_enable="NO"` in `rc.conf` sufficient? The latter should be sufficient. The kernel will drop IPv6 packets received on an interface with the IFDISABLED flag set, and they won't reach the affected code.