From owner-freebsd-announce@freebsd.org Tue Sep 15 23:32:47 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 924E43E3DB9 for ; Tue, 15 Sep 2020 23:32:47 +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 4BrffR2lYCz3ZtK; Tue, 15 Sep 2020 23:32:47 +0000 (UTC) (envelope-from security-advisories@freebsd.org) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=freebsd.org; s=dkim; t=1600212767; h=from:from:reply-to:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc; bh=/DAJp4uq+7ADOTtZMf7fq/pFydSdSdhP6lk4LRnmjOs=; b=rZ9Wp8DZ1Dwkx6jBiFS7lTC/IxX67c/11ahdvpQIioR+PjN55mRreHrN6JTsOfKsH874gd kXjkzqX2ajXWQG5zJlv6RGpt4tpglNwEkL77deI87AsPJ46NndJW3uMORTPsM2xhaTmDiH BPVbgJG+e2Z4UhD06atiQGpqkbIJwTQGMHPJV9ffrB/iBVf7VRkZUUP5fDWhXy3hFnvDNR EhGFH4G6UfDfp4SGZKrrH+CeRGyPDxA+b+1krtSbRBzHNCIsfUnVw5x6wtKWOppNj97oxv QuJMyZ7D2WE5rb2axc/42Vn/MIcYcf1Uef5TUl2+IlsqNeEzsdQZGW2btNrJ4A== Received: by freefall.freebsd.org (Postfix, from userid 945) id 355AE10FA6; Tue, 15 Sep 2020 23:32:47 +0000 (UTC) From: FreeBSD Security Advisories To: FreeBSD Security Advisories Reply-To: freebsd-security@freebsd.org Precedence: bulk Message-Id: <20200915233247.355AE10FA6@freefall.freebsd.org> Date: Tue, 15 Sep 2020 23:32:47 +0000 (UTC) ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=freebsd.org; s=dkim; t=1600212767; h=from:from:reply-to:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc; bh=/DAJp4uq+7ADOTtZMf7fq/pFydSdSdhP6lk4LRnmjOs=; b=NBrWIVJC5UCXYgi6rRRYROZTaYQKrnWR8uAZfbuYQmBfXXYnQGIb86FLJPrKCzg8G1XwvH u6wa+qnPK2Cr9+sM/H22P6Qp3topADeQKXbHsC+mqq6S1WhTZ+nhnB6nU0IILU9t/ZbwlC UoyYERnIW6fJ5kubmigF3YJRbnQvEb3iFXQnKW/3zGvtUg2jz7art1wRvo3LRm+Hf8oP3G dkJY2Nt8e2SUPd9DzcTRGrkz4Wg9pemHmNlmrR8Zl7bPRp0EPnAblnFU5t9es76F0jCIVb YbnO8i3T1rqQDcMTf4Fq6BV2Qw0sAWnOTSw0HjaxDBkBfq8aZwYCYyWQchmPQA== ARC-Seal: i=1; s=dkim; d=freebsd.org; t=1600212767; a=rsa-sha256; cv=none; b=Q+Vk3zwhm3Y3FqsiQaKTzBsZ6GsITmv8r2jalAuFtWFmFHOgCbTCN1fuwOL3wlHJpoX+Uz 5v055jeVQAjv4DPXKlpMv7+I8ysLzeGa2JpDmb7NQOjJdm6kS7RFicr4n0t/EBEDWCFeam kddIWd76+XDF/pQPC07BPcAxYKUbgnFp7tq3Bq7aEEssGqFnR3BkrihmCBXBvuORWh92QQ w186/3z+4mkO72So60nt9lW9K6pN15SqibWKSBrhbEuT25RvfjyYSuJ2SWBIHRlCiKnuyv bI2BFueqj/a0ecrYeWR27x9/oDyOcX2Ph/yzquu15GtH9EijWityS5E9FlDG/g== ARC-Authentication-Results: i=1; mx1.freebsd.org; none Subject: [FreeBSD-Announce] FreeBSD Security Advisory FreeBSD-SA-20:29.bhyve_svm 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: Tue, 15 Sep 2020 23:32:47 -0000 -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 ============================================================================= FreeBSD-SA-20:29.bhyve_svm Security Advisory The FreeBSD Project Topic: bhyve SVM guest escape Category: core Module: bhyve Announced: 2020-09-15 Credits: Maxime Villard Affects: All supported versions of FreeBSD. Corrected: 2020-09-15 20:25:30 UTC (stable/12, 12.2-STABLE) 2020-09-15 21:46:39 UTC (releng/12.2, 12.2-BETA1-p1) 2020-09-15 21:46:39 UTC (releng/12.1, 12.1-RELEASE-p10) 2020-09-15 20:26:31 UTC (stable/11, 11.4-STABLE) 2020-09-15 21:46:39 UTC (releng/11.4, 11.4-RELEASE-p4) 2020-09-15 21:46:39 UTC (releng/11.3, 11.3-RELEASE-p14) CVE Name: CVE-2020-7467 For general information regarding FreeBSD Security Advisories, including descriptions of the fields above, security branches, and the following sections, please visit . I. Background bhyve(8) is a hypervisor that supports running a variety of guest operating systems in virtual machines on AMD and Intel CPUs. AMD and Intel provide broadly similar virtualization interfaces, but each provides its own specific instructions for manipulating virtual machine state. II. Problem Description A number of AMD virtualization instructions operate on host physical addresses, are not subject to nested page table translation, and guest use of these instructions was not trapped. III. Impact - From kernel mode a malicious guest can write to arbitrary host memory (with some constraints), affording the guest full control of the host. IV. Workaround No workaround is available. Systems not using bhyve, and systems that use bhyve with an Intel CPU, are not vulnerable. 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. # fetch https://security.FreeBSD.org/patches/SA-20:29/bhyve_svm.patch # fetch https://security.FreeBSD.org/patches/SA-20:29/bhyve_svm.patch.asc # gpg --verify bhyve_svm.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/ r365767 releng/12.2/ r365780 releng/12.1/ r365780 stable/11/ r365769 releng/11.4/ r365780 releng/11.3/ r365780 - ------------------------------------------------------------------------- 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/A6HiuWv54gCjWNV05eS9J6n5cIFAl9hOJhfFIAAAAAALgAo aXNzdWVyLWZwckBub3RhdGlvbnMub3BlbnBncC5maWZ0aGhvcnNlbWFuLm5ldEZD MEU4NzhBRTVBRkU3ODgwMjhENjM1NUQzOTc5MkY0OUVBN0U1QzIACgkQ05eS9J6n 5cJxjxAAjy783UUnVvhtiJt4p5TGMpaU+ZrLnKaOASiTDdbp6z3IFuLZ1VbkekAM aMGgZNmYkRotcTM0mbhoeRROSrYlmO2ZHNmJyxchbOaIfKXL3iTFYP5gRirN1r+Q i8+Gr5HzTL5SkvTEx0wKUp6uRqD26nf7i4KrdOWmf5ivhB66Z2vk/56aX53eSNJ5 iPZYvlFnVIcy1wKPE1RIP67H+nqqWBApavWUMK6f01cAMr5w0BE+f4RdSvzEFnuG p2Id8A3ptt0VoIdZzbJkLKog4/dlC1C+PVPPLND2gcCY2c/+gG0nNTy9Fjdvsoor AnmRvlarCCcEVOSxGk+WNUwWdQnQPFykpZxGtid53km3Yjw1smPmfOVwvNhTkzoP tPZ568wFyaBGLI+39hC0u0AtLT93MBHpxpCMpQZ9rlFauxn5OuyBFkxgCuEyq728 GcrMVggyrzOetW7GqdlOEzFDj3nxHme+08qmbLXjv5X8N1RK+TGZDAjYFqLU1NXi cyPhbGqV4SuYw3dW7E0C8eOocuVmpXTEW82R9ff1pobUZUNVGKZse1rjT344VTSc DazL/q2TIo5fyDWEaNWsPad8mdyQGWft2cfYHYrO+Y6Smn/oKS3LmX61bGC37FEF b0rqunbDdq4775q6H6KKbRgVTKGiVyC/Nt/2xkg//GymzNnuFvY= =lplz -----END PGP SIGNATURE-----