From owner-freebsd-security@freebsd.org Tue Jun 18 14:57:19 2019 Return-Path: Delivered-To: freebsd-security@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 35E2215C0056 for ; Tue, 18 Jun 2019 14:57:19 +0000 (UTC) (envelope-from hiren@strugglingcoder.info) Received: from mail.strugglingcoder.info (mail.strugglingcoder.info [104.236.146.68]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "www.strugglingcoder.info", Issuer "StartCom Class 1 DV Server CA" (not verified)) by mx1.freebsd.org (Postfix) with ESMTPS id 2E3E181544 for ; Tue, 18 Jun 2019 14:57:18 +0000 (UTC) (envelope-from hiren@strugglingcoder.info) Received: from localhost (unknown [10.2.1.3]) (Authenticated sender: hiren@strugglingcoder.info) by mail.strugglingcoder.info (Postfix) with ESMTPA id C013F71D0C; Tue, 18 Jun 2019 07:57:09 -0700 (PDT) Date: Tue, 18 Jun 2019 07:57:09 -0700 From: hiren To: mike tancsa Cc: "freebsd-security@freebsd.org" Subject: Re: TCP SACK (CVE-2019-5599) Message-ID: <20190618145709.GI52008@strugglingcoder.info> References: <29d6e221-e88a-f828-0e5b-ac235691ed86@sentex.net> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="huBJOJF9BsF479P6" Content-Disposition: inline In-Reply-To: <29d6e221-e88a-f828-0e5b-ac235691ed86@sentex.net> User-Agent: Mutt/1.11.4 (2019-03-13) X-Rspamd-Queue-Id: 2E3E181544 X-Spamd-Bar: ------ X-Spamd-Result: default: False [-6.03 / 15.00]; ARC_NA(0.00)[]; TO_DN_EQ_ADDR_SOME(0.00)[]; R_DKIM_ALLOW(-0.20)[strugglingcoder.info:s=dkim]; RCVD_VIA_SMTP_AUTH(0.00)[]; FROM_HAS_DN(0.00)[]; TO_DN_SOME(0.00)[]; R_SPF_ALLOW(-0.20)[+mx]; NEURAL_HAM_LONG(-1.00)[-1.000,0]; MIME_GOOD(-0.20)[multipart/signed,text/plain]; IP_SCORE(-1.75)[ip: (-9.29), ipnet: 104.236.128.0/18(-0.52), asn: 14061(1.12), country: US(-0.06)]; NEURAL_HAM_MEDIUM(-1.00)[-1.000,0]; TO_MATCH_ENVRCPT_SOME(0.00)[]; MX_GOOD(-0.01)[mail.strugglingcoder.info]; DKIM_TRACE(0.00)[strugglingcoder.info:+]; RCPT_COUNT_TWO(0.00)[2]; SUBJ_ALL_CAPS(1.80)[24]; DMARC_POLICY_ALLOW(-0.50)[strugglingcoder.info,reject]; SIGNED_PGP(-2.00)[]; NEURAL_HAM_SHORT(-0.97)[-0.966,0]; FROM_EQ_ENVFROM(0.00)[]; MIME_TRACE(0.00)[0:+,1:+]; RCVD_TLS_LAST(0.00)[]; ASN(0.00)[asn:14061, ipnet:104.236.128.0/18, country:US]; MID_RHS_MATCH_FROM(0.00)[]; RCVD_COUNT_TWO(0.00)[2] 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, 18 Jun 2019 14:57:19 -0000 --huBJOJF9BsF479P6 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On 06/18/19 at 10:33P, mike tancsa wrote: > Hi all, > With respect to the bugs describe in > https://github.com/Netflix/security-bulletins/blob/master/advisories/thir= d-party/2019-001.md > * > SACK Slowness (FreeBSD 12 using the RACK TCP Stack) [snip] >=20 > ** >=20 > *How does I know if this is enabled in my default kernel on RELENG_12 ? > There is some vague mention in various forums this is not the default on > FreeBSD ? Can anyone shed more light as to how this does/does not impact > FreeBSD ? RACK is one of the tcp stacks ($src/sys/netinet/tcp_stacks) and not enabled by default. So, by default, FreeBSD is not affected, afaict. This advisory is for when you do use RACK. Cheers, Hiren --huBJOJF9BsF479P6 Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQGTBAABCgB9FiEEpOIPodh4jz8X5m8Ci5JQ4VY+3+UFAl0I+8JfFIAAAAAALgAo aXNzdWVyLWZwckBub3RhdGlvbnMub3BlbnBncC5maWZ0aGhvcnNlbWFuLm5ldEE0 RTIwRkExRDg3ODhGM0YxN0U2NkYwMjhCOTI1MEUxNTYzRURGRTUACgkQi5JQ4VY+ 3+VCwggApQi+zNlHF9fjbzHi+ksRQYB1HgdiQNVD8cCr2MqJ5PuNzR02fVPYNHWy HfluMRMQZdRiflaoRHs+oxVe/G1icIuepAIvjDFX1DSfy+EtwBm8SySDWRzrTyFf SypUigOs/EplPx0E2DfMSHDNbJzOf7WtYggE8e0KjHh2IVKTBFVg3q3300xQoNv1 abS0r9fsF2aldLul2Lns80nfwfR8rZ9tLXs8IxTGJ0FV4QXqAeuJMq6Dtm6e85en jgKqZyrXX6fecB2IDX04u/HmSQjTKzjbf3zI5mboYNgnQH5U052deve2zXUc+Igp 62dg7g0VYrgnQ+2Yb7vsxf+SE92x+g== =LTTn -----END PGP SIGNATURE----- --huBJOJF9BsF479P6--