Date: Wed, 19 Dec 2018 20:52:22 +0000 (UTC) From: FreeBSD Security Advisories <security-advisories@freebsd.org> To: FreeBSD Security Advisories <security-advisories@freebsd.org> Subject: [FreeBSD-Announce] FreeBSD Security Advisory FreeBSD-SA-18:15.bootpd Message-ID: <20181219205222.0C0A519B48@freefall.freebsd.org>
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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 ============================================================================= FreeBSD-SA-18:15.bootpd Security Advisory The FreeBSD Project Topic: bootpd buffer overflow Category: core Module: bootpd Announced: 2018-12-19 Credits: Reno Robert Affects: All supported versions of FreeBSD. Corrected: 2018-12-19 18:17:59 UTC (stable/12, 12.0-STABLE) 2018-12-19 18:21:07 UTC (releng/12.0, 12.0-RELEASE-p1) 2018-12-19 18:19:15 UTC (stable/11, 11.2-STABLE) 2018-12-19 18:22:25 UTC (releng/11.2, 11.2-RELEASE-p7) CVE Name: CVE-2018-17161 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/>. I. Background The bootpd utility implements an Internet Bootstrap Protocol (BOOTP) server as defined in RFC951, RFC1532, and RFC1533. II. Problem Description Due to insufficient validation of network-provided data it may be possible for a malicious attacker to craft a bootp packet which could cause a stack buffer overflow. III. Impact It is possible that the buffer overflow could lead to a Denial of Service or remote code execution. IV. Workaround Firewall rules may be used to limit reception of bootp packets to only trusted networks or hosts. Note that the bootp protocol is typically limited to a common layer 2 broadcast domain, although the bootpgw gateway can forward bootp requests and responses between subnets. V. Solution Upgrade your vulnerable system to a supported FreeBSD stable or release / security branch (releng) dated after the correction date. Restart bootpd if it is running in standalone mode. 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 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-18:15/bootpd.patch # fetch https://security.FreeBSD.org/patches/SA-18:15/bootpd.patch.asc # gpg --verify bootpd.patch.asc b) Apply the patch. Execute the following commands as root: # cd /usr/src # patch < /path/to/patch c) Recompile the operating system using buildworld and installworld as described in <URL:https://www.FreeBSD.org/handbook/makeworld.html>. Restart the applicable daemons, or reboot the system. VI. Correction details The following list contains the correction revision numbers for each affected branch. Branch/path Revision - ------------------------------------------------------------------------- stable/12/ r342228 releng/12.0/ r342230 stable/11/ r348229 releng/11.2/ r342231 - ------------------------------------------------------------------------- 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-2018-17161> The latest revision of this advisory is available at <URL:https://security.FreeBSD.org/advisories/FreeBSD-SA-18:15.bootpd.asc> -----BEGIN PGP SIGNATURE----- iQKTBAEBCgB9FiEE/A6HiuWv54gCjWNV05eS9J6n5cIFAlwane5fFIAAAAAALgAo aXNzdWVyLWZwckBub3RhdGlvbnMub3BlbnBncC5maWZ0aGhvcnNlbWFuLm5ldEZD MEU4NzhBRTVBRkU3ODgwMjhENjM1NUQzOTc5MkY0OUVBN0U1QzIACgkQ05eS9J6n 5cKfzg/+PhmA1AKfXFSkeJJPvdF/7hjKpWaCdVAyUZsuWH5L1Tmb4Lc/pLjw22Ba Xh/sAKik6pa/nVTZCBgAqoCqmV8CdhScwvRZdVSP5CQ9vnM+6fFcybP0aCZOmiJC NGAE8nIBdazqWJfNM9HUSIbdqEOtMlVcyE0Ni/TxzcAFdzFowfDnyRm1wqI4zhM7 YL7pU0kTYJfydjK540rHB1tNBaYHSJ/6ckK3tkjwjVgMsQwNSizKrPsqycoMlMmD TqQMfDwU8W/jFLsr7OZE66eQBysSiuzYAv3IsipL+50SYgS0aoo3LwKrCcYGN6c/ S/0SOfNHDgd/7wregI5adKqWJceaqZCVedSVLm6ZaG1Vt3alIjczX9D7wIjuXPlD AkSKa0HnmSwDC8yWLJYMxuny7vy3uBAUnPiwIT3RrsDC0b28/uwNPbeSbG0Wrf9F 21PDMfeCPc2Vr/TVj9uSIo20pNtVhy+tGbx1Ilsgi3POa3n7pTOuFWHMzQVe3rZA DLYEbliPxpq9NFJ/2UZQg25weOD5ygwaYZnbsXAMY47D4kteeQOjzomgiacVhE56 oT8z804nGgGdCe4LpiHihDVzCbBvvuEPw9Edffzm7EWykpy7qn/aJQehfPfcfbeA dvQ5khiLr0rMUeg9HU6oHu8+Lp4X+wQc3lCF2rXe+oqRierywec= =jlRR -----END PGP SIGNATURE-----
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