FreeBSD Security Advisory FreeBSD-SA-18:01.ipsec [REVISED]
8 March, 2018 by firstname.lastname@example.org | freebsd
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 ============================================================================= FreeBSD-SA-18:01.ipsec [REVISED] Security Advisory The FreeBSD Project Topic: ipsec validation and use-after-free Category: core Module: ipsec Announced: 2018-03-07 Credits: Maxime Villard Affects: All supported versions of FreeBSD. Corrected: 2018-02-24 13:04:02 UTC (stable/11, 11.1-STABLE) 2018-03-07 05:53:35 UTC (releng/11.1, 11.1-RELEASE-p7) 2018-03-07 16:55:15 UTC (stable/10, 10.4-STABLE) 2018-03-07 17:16:41 UTC (releng/10.4, 10.4-RELEASE-p7) 2018-03-07 17:16:41 UTC (releng/10.3, 10.3-RELEASE-p28) CVE Name: CVE-2018-6916 For general information regarding FreeBSD Security Advisories, including descriptions of the fields above, security branches, and the following sections, please visit <URL:https://security.FreeBSD.org/>. 0. Revision History v1.0 2018-03-07 Initial release. v1.1 2018-03-08 Correct patch for 10.x releases. I. Background The IPsec suite of protocols provide network level security for IPv4 and IPv6 packets. FreeBSD includes software originally developed by the KAME project which implements the various protocols that make up IPsec. In IPsec, the IP Authentication Header (AH) is used to provide protection against replay attacks and connectionless integrity and data origin authentication for IP datagrams. II. Problem Description Due to a lack of strict checking, an attacker from a trusted host can send a specially constructed IP packet that may lead to a system crash. Additionally, a use-after-free vulnerability in the AH handling code could cause unpredictable results. III. Impact Access to out of bounds or freed mbuf data can lead to a kernel panic or other unpredictable results. IV. Workaround No workaround is available, but systems not using IPsec are not vulnerable. V. Solution Perform one of the following: 1) Upgrade your vulnerable system to a supported FreeBSD stable or release / security branch (releng) dated after the correction date. And reboot the system. 2) 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 And reboot the system 3) To update your vulnerable system via a source code patch: The following patches have been verified to apply to the applicable FreeBSD release branches. [*** v1.1 NOTE ***] If your 10.x sources were already patched using the initially published advisory patches, you need to apply the ipsec-10.rev1.patch. If you had not yet patched your 10.x sources, you need only apply the ipsec-10.patch file. 11.1 sources were correct in the initial release and do not need to be updated. a) Download the relevant patch from the location below, and verify the detached PGP signature using your PGP utility. [FreeBSD 10.x system not patched with the original SA-18:01 patch] # fetch https://security.FreeBSD.org/patches/SA-18:01/ipsec-10.patch # fetch https://security.FreeBSD.org/patches/SA-18:01/ipsec-10.patch.asc # gpg --verify ipsec-10.patch.asc [FreeBSD 10.x that had been patched with the original SA-18:01 patch] # fetch https://security.FreeBSD.org/patches/SA-18:01/ipsec-10.rev1.patch # fetch https://security.FreeBSD.org/patches/SA-18:01/ipsec-10.rev1.patch.asc # gpg --verify ipsec-10.rev1.patch.asc [FreeBSD 11.1] # fetch https://security.FreeBSD.org/patches/SA-18:01/ipsec-11.patch # fetch https://security.FreeBSD.org/patches/SA-18:01/ipsec-11.patch.asc # gpg --verify ipsec-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 <URL:https://www.FreeBSD.org/handbook/kernelconfig.html> and reboot the system. VI. Correction details The following list contains the correction revision numbers for each affected branch. Branch/path Revision - ------------------------------------------------------------------------- stable/10/ r330609 releng/10.3/ r330611 releng/10.4/ r330611 stable/11/ r329907 releng/11.1/ r330566 - ------------------------------------------------------------------------- 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: <URL:https://svnweb.freebsd.org/base?view=revision&revision=NNNNNN> VII. References <URL:https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-6916> The latest revision of this advisory is available at <URL:https://security.FreeBSD.org/advisories/FreeBSD-SA-18:01.ipsec.asc> -----BEGIN PGP SIGNATURE----- iQKTBAEBCgB9FiEE/A6HiuWv54gCjWNV05eS9J6n5cIFAlqg1K9fFIAAAAAALgAo aXNzdWVyLWZwckBub3RhdGlvbnMub3BlbnBncC5maWZ0aGhvcnNlbWFuLm5ldEZD MEU4NzhBRTVBRkU3ODgwMjhENjM1NUQzOTc5MkY0OUVBN0U1QzIACgkQ05eS9J6n 5cJCDQ/+OpTS1PrKiwuRsJ5i0RWnS8C9d/dIn9C83JJtuxhGb+CEY5bYSVKufsW/ ilkUK3fiOWWwDHYecZW15qvt1E2E6Hm608b+K37bqL+FKobNj78B+KQr4erb0183 /Kqo0TKDtsUzr20sNFWgeQWgHP/EqyWyJuB2zfOSb1vGUViiuxJfMxajzfE2tKqh IDG/QpMvRolJFKSWdQnF08NIYLXfffZ4Sz9+VDCdfeLEQKi+LT6DJnlGDz/rR5iB TwyMg3AbobpGuuV0puOZTul2GiHaPwh/fJR8JoG13+kK5VznvrOXopLAl2CVAjtj mNuHeQHwaSQanSXgKtYxZG4/w1JDMSr60FKgG7FizhJ+9WAbjPySbb+wV5qJD4oY a8F2urt3Tj1c1l4juOctVW+NVSS96idpf9NsmsmticTujgBu+2k63+cSIchiNj1B ZcPw5PLgiC/r0P6FITrwXa7zJLNHdFrPvNihKTlEHJAgGno7FJJpdagxmcfGnpb2 74VlbQF7Tq+9NQJU23y9Vj3YL0XERB/b45oRHkBEoVJKgK9/4U4mzFufn4PfANUt 0hcgMlxTOVKt0S405dh4I6ok51iq6XDol18QoYbXJHqMuEq7Lo80fKuq8gpKmCJ0 h3NBYJKPUsngfJUisXS7VrQx3zTB8Yyp1BykpCDKET8LVJGmV7c= =RMG/ -----END PGP SIGNATURE----- _______________________________________________ email@example.com mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-announce To unsubscribe, send any mail to "firstname.lastname@example.org"