From owner-freebsd-security@freebsd.org Fri Jan 29 02:28:31 2021 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 AA4B94F640A for ; Fri, 29 Jan 2021 02:28:31 +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 "R3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4DRh8v3sR3z3MlX; Fri, 29 Jan 2021 02:28:31 +0000 (UTC) (envelope-from security-advisories@freebsd.org) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=freebsd.org; s=dkim; t=1611887311; h=from:from:reply-to:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc; bh=2qR1rAmjXqjyz1CR0nsdYkPVc+P2t2AZHPC+DZrKX6A=; b=ZAXyG6x30vRzlOVmfjRhVFsDxjikmYXo4WpFhGquAy1afBc1WMi9EJIRJEaglADwdy55N7 +MyM4A0YkK93c16NPG8gb31nY14oJK4NqxTSTNNy3WXy2QiGA2rrBd9kxZ9IEbt7/L8KLo NymqV3bEX+QUuHWUk3gG5Fr2WSmS84C0f0w+Rx/8Xa8sZ8EonZDZWo/AH9eC3Ls/RpUqLa ERVUoPqf3TqSN9bbjS+nnI5zOK+YtdVephevgiT83tiMCxX+ddgGZyBENGnKAsMH+3jrgL HdtJ/S5SNjJW75B449VgEtCwhKdldCb8KNph+NJusbLWCKoZHNUrWuGNDGql1A== Received: by freefall.freebsd.org (Postfix, from userid 945) id 6EE1A1DBB4; Fri, 29 Jan 2021 02:28:31 +0000 (UTC) From: FreeBSD Security Advisories To: FreeBSD Security Advisories Subject: FreeBSD Security Advisory FreeBSD-SA-21:02.xenoom Reply-To: freebsd-security@freebsd.org Precedence: bulk Message-Id: <20210129022831.6EE1A1DBB4@freefall.freebsd.org> Date: Fri, 29 Jan 2021 02:28:31 +0000 (UTC) ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=freebsd.org; s=dkim; t=1611887311; h=from:from:reply-to:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc; bh=2qR1rAmjXqjyz1CR0nsdYkPVc+P2t2AZHPC+DZrKX6A=; b=LukRbfH+OG9CDj5X0Adr1oRQZg405ZOHPJiujqoMLxW/nqbcAn2areBoeCsjY5tVD38H1F QviIFysZ8sKjZaA8F9SoCcIwMbhHHGxZ5GglDVnE/p3hF98P7O5GXpnkMrTVSS3HmZF4eg i4ALhWK74RTIiDBguXaXyJcD1uWtEf5rTEFecYVUr7MPFxNWR9lqsy2lqKFd0IAGXPPIZ/ r9epYLvvnvqzh55YOVa3k7pkDcd0LZLHRRlcjscYg/s4jKrDi1NlGJDoS736/FH8Sf46ak 9qjPBNxqmtoP/HaAAwXgypM2o7rCjW+gpvP4bS7bJJwjgkGLTuI8T9t04irmmA== ARC-Seal: i=1; s=dkim; d=freebsd.org; t=1611887311; a=rsa-sha256; cv=none; b=XopUCn6zFWgKdSV5rgkyXkfrEWCENd8q4eqKHI9dRb+NNZ5cQFnG2EGDvl/jNLERQaNQTu oY73TZM+kcrzPSWu1lH/WDqpmEjqoVKb9ke65r0+y7tUvYd8gdRbHu2nEp8AUmMj9XQtc0 7gxbvfFTSutW7KqF8QrUV7APVd5m5KEm/nWqQINtOpaMNARiPqlPfQPaZih/fvxa6omjrL Punz4CPlFVM4wYEbJigxAC9uowsxdcBGI2dW4NV5RiJLZzcCVxSOEjEzlNAvUjqasfZlUO +lV+O7lO+DCZHUhwvEul0ohhp86jEKkZ7Cw7SPzT3rEl8DMqjbFU9bAjgBzHNg== ARC-Authentication-Results: i=1; mx1.freebsd.org; none X-BeenThere: freebsd-security@freebsd.org X-Mailman-Version: 2.1.34 List-Id: "Security issues \[members-only posting\]" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 29 Jan 2021 02:28:31 -0000 -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 ============================================================================= FreeBSD-SA-21:02.xenoom Security Advisory The FreeBSD Project Topic: Xen guests can triger backend Out Of Memory Category: contrib Module: Xen Announced: 2021-01-29 Credits: See Xen XSA-349 for details Affects: All supported versions of FreeBSD. Corrected: 2021-01-18 16:26:36 UTC (stable/12, 12.2-STABLE) 2021-01-29 01:21:04 UTC (releng/12.2, 12.2-RELEASE-p3) 2021-01-29 01:06:16 UTC (releng/12.1, 12.1-RELEASE-p13) 2021-01-21 09:14:50 UTC (stable/11, 11.4-STABLE) 2021-01-29 00:20:16 UTC (releng/11.4, 11.4-RELEASE-p7) CVE Name: CVE-2020-29568 For general information regarding FreeBSD Security Advisories, including descriptions of the fields above, security branches, and the following sections, please visit . I. Background Xen is a type-1 hypervisor which supports FreeBSD as a Dom0 (or host domain). II. Problem Description Some OSes (including Linux, FreeBSD, and NetBSD) are processing watch events using a single thread. If the events are received faster than the thread is able to handle, they will get queued. As the queue is unbound, a guest may be able to trigger a OOM in the backend. III. Impact A malicious guest can trigger an OOM in backends. IV. Workaround No workaround is available. FreeBSD systems not using Xen are not affected. 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-21:02/xenoom.12.patch # fetch https://security.FreeBSD.org/patches/SA-21:02/xenoom.12.patch.asc # gpg --verify xenoom.12.patch.asc [FreeBSD 11.x] # fetch https://security.FreeBSD.org/patches/SA-21:02/xenoom.11.patch # fetch https://security.FreeBSD.org/patches/SA-21:02/xenoom.11.patch.asc # gpg --verify xenoom.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/ r369038 releng/12.2/ r369177 releng/12.1/ r369167 stable/11/ r369072 releng/11.4/ r369158 - ------------------------------------------------------------------------- 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/A6HiuWv54gCjWNV05eS9J6n5cIFAmATbjNfFIAAAAAALgAo aXNzdWVyLWZwckBub3RhdGlvbnMub3BlbnBncC5maWZ0aGhvcnNlbWFuLm5ldEZD MEU4NzhBRTVBRkU3ODgwMjhENjM1NUQzOTc5MkY0OUVBN0U1QzIACgkQ05eS9J6n 5cJjmhAAloDel7j9rgyDK8Ozk5wPJQlUM/1Ddc4e5Q5vdzT29mNdWKfXjH5SEkGq Jx7w4fUronf8vsXn+bNXwn1u5PWGVTVX/Y4ljQ4JVwJ+NdxhxTuhNsbg7j2AZmdO PsfI+eFX1xq8wr3oDUl3GTHHcUI1Ol259tsOgJE7ISriazgbRk8/QVowMgS3jdHA OYJS8ADFWSO6d4TC2B5pvgC6NAiZjhgTDtjxzTnaWoUb0157JyhRh3Z2FQTBxoxU 3OQcTj7x7KBtbsiAI/Iq8Qu7JXyxtscVQfbXsk4Jt1uOskgsr8n9F+UGiP+GRIKb 0IsgNUlsPavINlNJjAwQWHtB8VJqH7LpG9t3/EMizUXjZAuRLxEjAFiHV8ju1U++ O9Xf9nB9auVrBn1WMYgH23bZ5D15W1HosEywifBw64R7CLDliD/HpJ3QaDEe3lCn pB0jgxuoE5RCbTppgUZM7tLUrtwgih+lOiZcLcA5xS9hQo8TWBLIJNBf5rRjJA6q /3vh5lOv/w8AHyBgA5395QIkkgw9dxy2o+LbtuVhdD/NbLX4GnNVMkQDsTF79PMT 8rl0Zn6Ldo0ypHAwPAVHektl+izuMftNQuQXSbEjkw/Xr1VCjIjllJET3K2e9X6z 4nPmq6t/0kuHWYSSDQAKdq/8Dosn3HLw1uQdst4ka7wf1Eon7Ow= =3L3L -----END PGP SIGNATURE-----