From owner-freebsd-security@freebsd.org Tue May 12 19:44:41 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 2BC872F908B for ; Tue, 12 May 2020 19:44:41 +0000 (UTC) (envelope-from security-advisories@freebsd.org) Received: from freefall.freebsd.org (freefall.freebsd.org [96.47.72.132]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) server-signature RSA-PSS (4096 bits) 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 49M7YN6zgDz3F3C; Tue, 12 May 2020 19:44:40 +0000 (UTC) (envelope-from security-advisories@freebsd.org) Received: by freefall.freebsd.org (Postfix, from userid 945) id 8CA83353A; Tue, 12 May 2020 19:44:40 +0000 (UTC) From: FreeBSD Security Advisories To: FreeBSD Security Advisories Subject: FreeBSD Security Advisory FreeBSD-SA-20:15.cryptodev Reply-To: freebsd-security@freebsd.org Precedence: bulk Message-Id: <20200512194440.8CA83353A@freefall.freebsd.org> Date: Tue, 12 May 2020 19:44:40 +0000 (UTC) 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, 12 May 2020 19:44:41 -0000 -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 ============================================================================= FreeBSD-SA-20:15.cryptodev Security Advisory The FreeBSD Project Topic: Use after free in cryptodev module Category: core Module: cryptodev Announced: 2020-05-12 Credits: Yuval Kanarenstein Affects: All supported versions of FreeBSD. Corrected: 2020-01-20 11:19:55 UTC (stable/12, 12.1-STABLE) 2020-05-12 16:57:47 UTC (releng/12.1, 12.1-RELEASE-p5) 2020-01-20 11:19:55 UTC (stable/11, 11.3-STABLE) 2020-05-12 16:57:47 UTC (releng/11.3, 11.3-RELEASE-p9) CVE Name: CVE-2019-15879 Note: The upcoming release of FreeBSD 11.4 was branched after the original commit to the stable branch and already includes the fix for this advisory. For general information regarding FreeBSD Security Advisories, including descriptions of the fields above, security branches, and the following sections, please visit . I. Background The cryptodev module permits userland applications to offload cryptographic requests to device drivers in the kernel. Applications create sessions via file descriptors opened from /dev/crypto. II. Problem Description A race condition permitted a data structure in the kernel to be used after it was freed by the cryptodev module. III. Impact An unprivileged process can overwrite arbitrary kernel memory. IV. Workaround Unload the cryptodev kernel module if it is loaded: # kldunload cryptodev Note that the cryptodev module is not loaded by default and is not used by most applications. Specificially, use of accelerated software cryptography, such as AES-NI, in userland applications via libraries such as OpenSSL do not make use of the cryptodev module. V. Solution Upgrade your vulnerable system to a supported FreeBSD stable or release / security branch (releng) dated after the correction date, and reboot the system. 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] # fetch https://security.FreeBSD.org/patches/SA-20:15/cryptodev.12.patch # fetch https://security.FreeBSD.org/patches/SA-20:15/cryptodev.12.patch.asc # gpg --verify cryptodev.12.patch.asc [FreeBSD 11.3] # fetch https://security.FreeBSD.org/patches/SA-20:15/cryptodev.11.patch # fetch https://security.FreeBSD.org/patches/SA-20:15/cryptodev.11.patch.asc # gpg --verify cryptodev.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/ r356908 releng/12.1/ r360976 stable/11/ r356908 releng/11.3/ r360976 - ------------------------------------------------------------------------- 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/A6HiuWv54gCjWNV05eS9J6n5cIFAl663tdfFIAAAAAALgAo aXNzdWVyLWZwckBub3RhdGlvbnMub3BlbnBncC5maWZ0aGhvcnNlbWFuLm5ldEZD MEU4NzhBRTVBRkU3ODgwMjhENjM1NUQzOTc5MkY0OUVBN0U1QzIACgkQ05eS9J6n 5cLW2A//VW8iJqNaBHhMnCrpl+oDTadzGM3gYVxnM+EEQYzru2Ze0z0tShiAkXrQ NryjwBpMA3r1nyWDYaWMgbHjcG+jQdsIvoiA+fSU9hXEUbpxwX9ZKlaSZUBDX48X YScJMewgHCXNpgkTnIckaIyIadOXX+zWhi5T0LN2tS5M5oejTLndAKo9mQm1Ni50 PYiHFkLzO7v4H6K0cKuJRuHF8+kU1IhvOinZuXwZXoGqmPGTVsA0+T27dWhosaWv Yqh3Pbp5oS1y3NbbOadLPhY146pT2Qrb2mQOEiHvsXMFRgjIEQzH1MYXx5gvpa4K CkMwCV/MuNotscVZ00qhVQEGEVlrhgi2IXinzxde5HYCc3mD/KdcYnYz9zOCeIfb 9RfdvKk8uzUITLyz8ZinZBqIHghnSG3M9/cNj2o/97yRfFJazXF/SI41YoV3hcyE Gb1ncYfaAJ4rL9U6xHMw7V+1LSlMrVsIcWxCM2PS4NTwWcZ8K7mEX51ARjx4k7lx IBEsJ+ExSfZHNkS6/DLZiuLEQKFxIOKlRyZQTALnzNaNTp763idW7zA+9k8ceBRH VO7x3EGNqNPhIss+JHOxDUaXTFfJTcd7XGv291unkZwBJuFhJBfH3S+ZCcF38xVK aweHOoJW5V+D9GKygb9oLjOxOupRkFuRrHFQcvj57FYqs9/GDVc= =8E1l -----END PGP SIGNATURE-----