From owner-freebsd-security@freebsd.org Tue Sep 15 23:32:33 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 6ECE03E3F7B for ; Tue, 15 Sep 2020 23:32:33 +0000 (UTC) (envelope-from security-advisories@freebsd.org) Received: from freefall.freebsd.org (freefall.freebsd.org [IPv6:2610:1c1:1:6074::16:84]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "freefall.freebsd.org", Issuer "Let's Encrypt Authority X3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4Brff92BJvz3Zbr; Tue, 15 Sep 2020 23:32:33 +0000 (UTC) (envelope-from security-advisories@freebsd.org) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=freebsd.org; s=dkim; t=1600212753; h=from:from:reply-to:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc; bh=HDEXKUBjskOUvl9pYxpNDLw07wwkmmoIabKHFOTrqUE=; b=qZEfNN3k3Qrd1oXf5Pq989CnwmIKp9WNlY60ywciHL4j0Bh9BzHCM5T66h5i66C3psVZLt q1712hkWbGumY1QYONhqVQJvj15uinjqIn9njzi0xSfEptK/wybTY5ppftngTRr68kyxF2 0SkXDRV0uYHshLCQF/DdLogfzrkAH8iTFug57BjDLPzTKL4NIFP2F/4EWM2Bq0uNl9VT1t iEpM8ctVBtSuR/wYRg6/52ZuewPohyn36TJFvmDfNU8dsIOzZx4S+YbpXOuNAhjghGMyjG eDHaUiygBasa2hTyeE3QPn1/ineaL0q1tOy3TDZiDOiIst3EQEgP9uixUVlYOA== Received: by freefall.freebsd.org (Postfix, from userid 945) id 431CD10F0C; Tue, 15 Sep 2020 23:32:33 +0000 (UTC) From: FreeBSD Security Advisories To: FreeBSD Security Advisories Subject: FreeBSD Security Advisory FreeBSD-SA-20:27.ure Reply-To: freebsd-security@freebsd.org Precedence: bulk Message-Id: <20200915233233.431CD10F0C@freefall.freebsd.org> Date: Tue, 15 Sep 2020 23:32:33 +0000 (UTC) ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=freebsd.org; s=dkim; t=1600212753; h=from:from:reply-to:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc; bh=HDEXKUBjskOUvl9pYxpNDLw07wwkmmoIabKHFOTrqUE=; b=xAvkk2nKq4q/VPr9moOkdcpJiGfXsVXyextV9CXw85voWvlefYtUtalKL8c8wP/MMvoGOE GVfZhUGCNOof96FYQYpGBSiTZub+ySefoiimxy1KNqd2iql+n0zT45GumpGB+c3Simkc5y JgEZht7jtGBApyjd2ayjJYbPcpT4Zc1OBIzchsAYnczpOKi5Aj0tY9pRumAywaPZ/8MQag WIKQjl7WF9RLqt4Zc4QSesXawkGzVNh9i/9vXefK8VY1BJ1KJVabzZX1i1A2R3w87crkqf hq/7+QjlSwRFtq3Y6hz9CI1stDnGr0NwRMlgYmuL9vk2OB5EFHFI6WVXq5qn3A== ARC-Seal: i=1; s=dkim; d=freebsd.org; t=1600212753; a=rsa-sha256; cv=none; b=elcmc0wUNtFG005GySi70TuBw9FjFUdPrri1zOSMbyGn50FrELmCcQbjW2ZcQkRDy4eNCg wfV7ZnJyq3TgrKQgMOt0eWVEYFPwcVz/mlhomQH+Ky7TkN8k0PPdy5EvDbD+lSxhUoGp0d /ajWYSJy+XB7ppMSBmyFwRdONS460qIS2oebS+MMBF1j2Vec3u2FXhMVYOjHwqf3gpDSuG QH/ndnk2my0H+NPxzceI3GQACVf2JFKOmBRFabVmlJLdQUyPK11oe4LjMGu6z+oIqqaDpp 9cpbhtLa2JHwKagMk/HIfl+whBkFW5KFTfGYqDCf7uDQ5R6hyt70MCpFTl/FxQ== ARC-Authentication-Results: i=1; mx1.freebsd.org; none X-BeenThere: freebsd-security@freebsd.org X-Mailman-Version: 2.1.33 List-Id: "Security issues \[members-only posting\]" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 15 Sep 2020 23:32:33 -0000 -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 ============================================================================= FreeBSD-SA-20:27.ure Security Advisory The FreeBSD Project Topic: ure device driver susceptible to packet-in-packet attack Category: core Module: ure Announced: 2020-09-15 Credits: John-Mark Gurney Affects: All supported versions of FreeBSD. Corrected: 2020-09-14 19:39:43 UTC (stable/12, 12.2-STABLE) 2020-09-15 21:42:05 UTC (releng/12.2, 12.2-BETA1-p1) 2020-09-15 21:42:05 UTC (releng/12.1, 12.1-RELEASE-p10) 2020-09-15 00:22:30 UTC (stable/11, 11.4-STABLE) 2020-09-15 21:42:05 UTC (releng/11.4, 11.4-RELEASE-p4) 2020-09-15 21:42:05 UTC (releng/11.3, 11.3-RELEASE-p14) CVE Name: CVE-2020-7464 For general information regarding FreeBSD Security Advisories, including descriptions of the fields above, security branches, and the following sections, please visit . I. Background The ure(4) driver provides support for USB Ethernet adapters based on the Realtek RTL8152 and RTL8153 USB Ethernet controllers. II. Problem Description A programming error in the ure(4) device driver caused some Realtek USB Ethernet interfaces to incorrectly report packets with more than 2048 bytes in a single USB transfer as having a length of only 2048 bytes. An adversary can exploit this to cause the driver to misinterpret part of the payload of a large packet as a separate packet, and thereby inject packets across security boundaries such as VLANs. III. Impact An attacker that can send large frames (larger than 2048 bytes in size) to be received by the host (be it VLAN, or non-VLAN tagged packet), can inject arbitrary packets to be received and processed by the host. This includes spoofing packets from other hosts, or injecting packets to other VLANs than the host is on. IV. Workaround No workaround is available. However, an attacker needs to be able to inject large frames. If a switch can prevent large frames (>2048 bytes) from being received, or connecting the machine to a switch that does not forward large frames will mitigate this attack. V. Solution Upgrade your vulnerable system to a supported FreeBSD stable or release / security branch (releng) dated after the correction date, and reboot. Perform one of the following: 1) To update your vulnerable system via a binary patch: Systems running a RELEASE version of FreeBSD on the i386 or amd64 platforms can be updated via the freebsd-update(8) utility: # freebsd-update fetch # freebsd-update install # shutdown -r +10min "Rebooting for a security update" 2) To update your vulnerable system via a source code patch: The following patches have been verified to apply to the applicable FreeBSD release branches. a) Download the relevant patch from the location below, and verify the detached PGP signature using your PGP utility. [FreeBSD 12.1, FreeBSD 12.2] # fetch https://security.FreeBSD.org/patches/SA-20:27/ure.12.patch # fetch https://security.FreeBSD.org/patches/SA-20:27/ure.12.patch.asc # gpg --verify ure.12.patch.asc [FreeBSD 11.3, FreeBSD 11.4] # fetch https://security.FreeBSD.org/patches/SA-20:27/ure.11.patch # fetch https://security.FreeBSD.org/patches/SA-20:27/ure.11.patch.asc # gpg --verify ure.11.patch.asc b) Apply the patch. Execute the following commands as root: # cd /usr/src # patch < /path/to/patch c) Recompile your kernel as described in and reboot the system. VI. Correction details The following list contains the correction revision numbers for each affected branch. Branch/path Revision - ------------------------------------------------------------------------- stable/12/ r365730 releng/12.2/ r365778 releng/12.1/ r365778 stable/11/ r365738 releng/11.4/ r365778 releng/11.3/ r365778 - ------------------------------------------------------------------------- To see which files were modified by a particular revision, run the following command, replacing NNNNNN with the revision number, on a machine with Subversion installed: # svn diff -cNNNNNN --summarize svn://svn.freebsd.org/base Or visit the following URL, replacing NNNNNN with the revision number: VII. References The latest revision of this advisory is available at -----BEGIN PGP SIGNATURE----- iQKTBAEBCgB9FiEE/A6HiuWv54gCjWNV05eS9J6n5cIFAl9hOIxfFIAAAAAALgAo aXNzdWVyLWZwckBub3RhdGlvbnMub3BlbnBncC5maWZ0aGhvcnNlbWFuLm5ldEZD MEU4NzhBRTVBRkU3ODgwMjhENjM1NUQzOTc5MkY0OUVBN0U1QzIACgkQ05eS9J6n 5cJY9A//Z+Rt20iUnM79er+CYF4EQNrzR8dOKr2/6L5ho5L1kJt0MdZtamN+f5Bq Jpzem060oAv+0mgAiK3VR7unlkEk+wFNvMwhgItvI8l2TME3+n/A0nsYQkP9QPPp SwHmKcIAbwkdtv913zy7AGc/vE+2+D8x84WHp6WDhRmDVgU5QAPGgP4yv0qhgkpy L8ndLDte3tXMk0eWArxWTpMfxqKGmp9Cgy88QRoIpguazS+ocSVt6h3emxQPtTc/ 7SQOEqjg4IiEXW/t2SSDqB1cvNPmN82yJt4mQg1m8v/SjFjFQ2qgFC+47cYezI1F nLuoDw16kYUu65DyePiXfCsBwSjkLU1IgpBSgmmxjMzwoVgE7/9AtRqiCwe2xkEF E6c1VWAQAw2AiZmsISv8T9RNLegLnNjyhO9iSsaeuOfLbTIeQ9zbcUL6xgZB6AxO tk/fkt+NHwuRoXNx2SC959r+hwhdnrpgxTEphjCFuuMdMGKsxm3TQGdwD6ZvQ1r2 HkVV1m4ukgpxw8ONa88Lgo+2f1HZhZKWLzp3EsTA3LMpgk+5uJjIuL/ctuddscWY Do9VapPTIGxjZqABGtxJL7NrzCz2pXE0CHzAjFWD830kujgcdihe6FbJx0cJe3m8 +CxaGBXvSINHyPwgDArnKR3Hrd57/T6RSUWqsksB7fBCpmFdQaI= =S9sW -----END PGP SIGNATURE-----