From owner-freebsd-announce@freebsd.org Wed Aug 5 17:54:25 2020 Return-Path: Delivered-To: freebsd-announce@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 3FD9537D09A for ; Wed, 5 Aug 2020 17:54:25 +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 4BMK4x12sQz3fH7; Wed, 5 Aug 2020 17:54:25 +0000 (UTC) (envelope-from security-advisories@freebsd.org) Received: by freefall.freebsd.org (Postfix, from userid 945) id 1277F1B787; Wed, 5 Aug 2020 17:54:25 +0000 (UTC) From: FreeBSD Security Advisories To: FreeBSD Security Advisories Reply-To: freebsd-security@freebsd.org Precedence: bulk Message-Id: <20200805175425.1277F1B787@freefall.freebsd.org> Date: Wed, 5 Aug 2020 17:54:25 +0000 (UTC) Subject: [FreeBSD-Announce] FreeBSD Security Advisory FreeBSD-SA-20:21.usb_net X-BeenThere: freebsd-announce@freebsd.org X-Mailman-Version: 2.1.33 List-Id: "Project Announcements \[moderated\]" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 05 Aug 2020 17:54:25 -0000 -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 ============================================================================= FreeBSD-SA-20:21.usb_net Security Advisory The FreeBSD Project Topic: Potential memory corruption in USB network device drivers Category: core Module: kernel Announced: 2020-08-05 Credits: Ilja van Sprundel, IOActive Affects: All supported versions of FreeBSD. Corrected: 2020-06-14 05:25:06 UTC (stable/12, 12.1-STABLE) 2020-08-05 17:11:18 UTC (releng/12.1, 12.1-RELEASE-p8) 2020-06-14 05:27:37 UTC (stable/11, 11.4-STABLE) 2020-08-05 17:11:18 UTC (releng/11.4, 11.4-RELEASE-p2) 2020-08-05 17:11:18 UTC (releng/11.3, 11.3-RELEASE-p12) CVE Name: CVE-2020-7459 For general information regarding FreeBSD Security Advisories, including descriptions of the fields above, security branches, and the following sections, please visit . I. Background FreeBSD includes a number of USB Ethernet network interface device drivers, including: - smsc(4), supporting SMSC (now Microchip) devices - muge(4), supporting Microchip devices - cdceem(4), supporting USB Communication Device Class compatible devices II. Problem Description A missing length validation code common to these three drivers means that a malicious USB device could write beyond the end of an allocated network packet buffer. III. Impact An attacker with physical access to a USB port and the ability to bring a network interface up may be able to use a specially crafted USB device to gain kernel or user-space code execution. IV. Workaround No workaround is available. Systems with no active (i.e., UP) interface supported by any of the smsc(4), muge(4), and cdceem(4) drivers are not vulnerable. Exploitation likely requires malicious USB hardware that emulates hardware supported by one of these device drivers. 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.x] # fetch https://security.FreeBSD.org/patches/SA-20:21/usb_net.12.patch # fetch https://security.FreeBSD.org/patches/SA-20:21/usb_net.12.patch.asc # gpg --verify usb_net.12.patch.asc [FreeBSD 11.x] # fetch https://security.FreeBSD.org/patches/SA-20:21/usb_net.11.patch # fetch https://security.FreeBSD.org/patches/SA-20:21/usb_net.11.patch.asc # gpg --verify usb_net.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/ r362166 releng/12.1/ r363921 stable/11/ r362167 releng/11.4/ r363921 releng/11.3/ r363921 - ------------------------------------------------------------------------- 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/A6HiuWv54gCjWNV05eS9J6n5cIFAl8q63dfFIAAAAAALgAo aXNzdWVyLWZwckBub3RhdGlvbnMub3BlbnBncC5maWZ0aGhvcnNlbWFuLm5ldEZD MEU4NzhBRTVBRkU3ODgwMjhENjM1NUQzOTc5MkY0OUVBN0U1QzIACgkQ05eS9J6n 5cIp7g//ZGKbxNKWsYEFXwNbBVbtkWMCQbj0V0TG2NReOsbYYhOolfkErZBpeTHt iFJr5m3WY21a6ks/8up02HJyZ5oZwFFeMOMF/CKibZuym/8L8XgoU0uh/eHLiTvZ qRf3p43xegcKgatFPggKA0yewNxMNETHI7BeO6+pkwYFQgb7f9GhM4JzC+DmaX6i kyGcrnYoZzgKo2BGt65VRbvzucw/Su7wL4JutKhZlXDz7kxFv1gxB8Dqk9BBW9QM EHejzhMCo6T0doYKLuZnz+SI2a/LOcTuNgR+5RnnxsVziLx+8csMNYy3YVw6JNXe XC+8aJ7Un8BLKDoNJjoZ/J9IygJoaWgUa9+SH0pAtOeWhrfRUgd74ZZWfhiZkK5U AXgY46c6Ce28TbEHTWgOAQgXRNB7iJgxVo6mTSnDt8t3YWh4t3g/rjHPKHagTNYC aCd6gcJewb1Pw/8X/7H1FXRtUleHgMaxQ7ec8V5BwcXSexo4xZfq8qQTUbCuRmDg 4GaF8SondVb1TJxHwfq2wWvFhiwMWnRxwwjY6jkxiIjecc5vtrb2bwRq7nmKWciT uV0jRj9ttP73ftE/zO94avXCbpCfHXMSpwaJMcs8PH+sHYXNhy0awuIped1ANXlh E2jrNBW85gyKpnjfcAgECFid3Cu1V1xWo1BCTOWJXQjKi2Gaoa0= =xbKP -----END PGP SIGNATURE-----