FreeBSD Security Advisory FreeBSD-SA-16:13.bind

Fabricante: FreeBSD
Fecha: 10/03/2016
Identificador: FreeBSD-SA-16:13.bind
FreeBSD Security Advisory FreeBSD-SA-16:13.bind
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 ============================================================================= FreeBSD-SA-16:13.bind Security Advisory The FreeBSD Project Topic: Multiple BIND vulnerabilities Category: contrib Module: bind Announced: 2016-03-10 Credits: ISC Affects: FreeBSD 9.x Corrected: 2016-03-10 07:47:55 UTC (stable/9, 9.3-STABLE) 2016-03-10 10:03:28 UTC (releng/9.3, 9.3-RELEASE-p38) CVE Name: CVE-2016-1285, CVE-2016-1286 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. II. Problem Description Testing by ISC has uncovered a defect in control channel input handling which can cause named to exit due to an assertion failure in sexpr.c or alist.c when a malformed packet is sent to named's control channel (the interface which allows named to be controlled using the "rndc" server control utility). [CVE-2016-1285] An error when parsing signature records for DNAME records having specific properties can lead to named exiting due to an assertion failure in resolver.c or db.c. [CVE-2016-1286] III. Impact A remote attacker can deliberately trigger the failed assertion if the DNS server accepts remote rndc commands regardless if authentication is configured. Note that this is not enabled by default. [CVE-2016-1285] A remote attacker who can cause a server to make a query deliberately chosen to generate a response containing a signature record which would trigger a failed assertion and cause named to stop. Disabling DNSsec does not provide protection against this vulnerability. [CVE-2016-1286] 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. # fetch https://security.FreeBSD.org/patches/SA-16:13/bind.patch # fetch https://security.FreeBSD.org/patches/SA-16:13/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 named(8) daemon, or reboot the system. VI. Correction details The following list contains the correction revision numbers for each affected branch. Branch/path Revision - ------------------------------------------------------------------------- stable/9/ r296608 releng/9.3/ r296611 - ------------------------------------------------------------------------- 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 v2.1.11 (FreeBSD) iQIcBAEBCgAGBQJW4UdUAAoJEO1n7NZdz2rnmRwQAIXDSu/gX5A+CFv6+9/2ak+H 3JOMO8p7KSKWhc1Hh7uqTUEy04lmpUylzK6Kj3h5PDNVaObxCcqsCAdy9xLYv8Q6 scBLeaDRPnwVQ1Mb/pkx1pdKSG7oKjY00PY0/hTKOVJUC1tJIoiAX8ExFqt53UKc LHjzrFrHh/0lBebYj8jmqW8Pxhi8nluuwWhtrwFgiG/XR15k69TRjPHnLOfXVwqs ORJb/8pVHYsNkGP3JB1xWMVs1nKLjzc7+Gm43OmLCa6QeLgQWqYmguoUl0FEHpoI nPqlukYT3V9BfMR+fwoNXXUjgjiK66onvS/O3yhyCPCrRgnw0ZVVSF2jbPUhT638 p1QwN9snoTzxY0CpCjcjpZvf9Zhfyzc8UFnl2hm0rmAuCiOPBTeJ16AG3a8S40vF /xoq4P6gNxUTQrPpGmG3Z/tfUQsxIpzib9D6ncDD5feuRyLB9y/MQSK1wxZjXDjk 2Bmaqk5foXNJfNEViNfJ4yy2qqED114ZpPIcDbSyIX9HeiKBo9BTEZ7Q9nEUHurN GcnvimUuhk+hYJDEsELDSGDSLT6aMaD/hXVTMQeQwxQKh7QDFfzJsUlA44tqB56V sn6VfIiA++K/JAFrAExD2FhtaIlOsUx24dUYkhcfNuVVBm3lgGCECeKGFxdNu2SM kRc1+1ihyNRolL47E3s/ =OncW -----END PGP SIGNATURE-----