FreeBSD Security Advisory FreeBSD-SA-16:08.bind

Fabricante: FreeBSD
Fecha: 27/01/2016
Identificador: FreeBSD-SA-16:08.bind
FreeBSD Security Advisory FreeBSD-SA-16:08.bind
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 ============================================================================= FreeBSD-SA-16:08.bind Security Advisory The FreeBSD Project Topic: BIND remote denial of service vulnerability Category: contrib Module: bind Announced: 2016-01-27 Credits: ISC Affects: FreeBSD 9.x Corrected: 2016-01-20 08:54:35 UTC (stable/9, 9.3-STABLE) 2016-01-27 07:42:11 UTC (releng/9.3, 9.3-RELEASE-p35) CVE Name: CVE-2015-8704 For general information regarding FreeBSD Security Advisories, including descriptions of the fields above, security branches, and the following sections, please visit . I. Background BIND 9 is an implementation of the Domain Name System (DNS) protocols. The named(8) daemon is an Internet Domain Name Server. Address Prefixes List (APL RR) is a type of DNS Resource Record defined in RFC 3123. II. Problem Description There is an off-by-one error in a buffer size check when performing certain string formatting operations. III. Impact Slaves using text-format db files could be vulnerable if receiving a malformed record in a zone transfer from their master. Masters using text-format db files could be vulnerable if they accept a malformed record in a DDNS update message. Recursive resolvers are potentially vulnerable when debug logging is enabled and if they are fed a deliberately malformed record by a malicious server. A server which has cached a specially constructed record could encounter this condition while performing 'rndc dumpdb'. IV. Workaround No workaround is available, but hosts not running named(8) 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. The named service has to be restarted after the update. A reboot is recommended but not required. 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 The named service has to be restarted after the update. A reboot is recommended but not required. 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. a) Download the relevant patch from the location below, and verify the detached PGP signature using your PGP utility. [FreeBSD 9.3] # fetch https://security.FreeBSD.org/patches/SA-16:08/bind.patch # fetch https://security.FreeBSD.org/patches/SA-16:08/bind.patch.asc # gpg --verify bind.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 . 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/9/ r294405 releng/9.3/ r294905 - ------------------------------------------------------------------------- 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----- Version: GnuPG v2.1.8 (FreeBSD) iQIcBAEBCgAGBQJWqHmfAAoJEO1n7NZdz2rngIkP/Ru1a5U14/iJKqGO2o+OQkk5 j9G3rwEQROlPhtHdUE3vtA2fZcsayJaK1CjU3j91VWlTXHfBnju6gbJVPntNQqe5 TxRFmRhRjcyreNdt6hKvFgDrXmWwrytRukJ/XafdYxoWFDTtrUScwrOH87U8ILcF gkWgzCQ7EnYqr7sEW1makDHmIOLukJo5pJOnUTRkraDP2oaKSros3GC+Fnh6Wf+q wYOkgl2gj96ubJW4SvdZCAKFtnMrhw0ZZyrVDuPojzWU+ZotzWvZz3xGvoSqXy5U rqqtUQNHMU0Aqhe9zurW4B2ioff6XALZPgRYqQRI8ezXTgDDhJSwa12mjTJuQmaR hQRJlW5u5/Ejj2NML6NkhvLuSApwZcAZ2G7cLGdR6nEKKVEb6mXgnL7T/CdhhTj8 2owIz1iIdI2sUmhv6vuxPxB1k/O7b76LTZ2AL6jx4/mEtOVeofpNej5w7qnvCSqV RcZsOYRXrMZ0YWuhBkKqnMGGIU0TBMDvjJL5gxf5RR14iLExcC1fKhkhbvRMag4Y ck7Ja45Ltpwtd0t7/AfzbeI4OVmos4NB36HK5pYJchmOUavm6im5V6781mYGZgQn HtOQEyi7tSeft+Fz21dmK6Z1GV6lRmrt52wAKyJ71nA/WESgma50WE49RX+cH1MH nmon5PYKLuMuzFVNYZWs =HYpu -----END PGP SIGNATURE-----