223eda903e
Fix Denial of Service vulnerability in named(8). [13:07] Fix a bug that allows remote client bypass the normal access checks when when -network or -host restrictions are used at the same time with -mapall. [13:08]
121 lines
4.2 KiB
Text
121 lines
4.2 KiB
Text
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=============================================================================
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FreeBSD-SA-13:07.bind Security Advisory
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The FreeBSD Project
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Topic: BIND remote denial of service
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Category: contrib
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Module: bind
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Announced: 2013-07-26
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Credits: Maxim Shudrak and the HP Zero Day Initiative, ISC
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Affects: FreeBSD 8.4-RELEASE and FreeBSD 9.x
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Corrected: 2013-07-26 22:53:17 UTC (stable/8, 8.4-STABLE)
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2013-07-26 22:40:17 UTC (releng/8.4, 8.4-RELEASE-p2)
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2013-07-26 22:43:09 UTC (stable/9, 9.2-BETA2)
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2013-07-26 22:40:23 UTC (releng/9.1, 9.1-RELEASE-p5)
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CVE Name: CVE-2013-4854
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For general information regarding FreeBSD Security Advisories,
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including descriptions of the fields above, security branches, and the
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following sections, please visit <URL:http://security.FreeBSD.org/>.
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I. Background
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BIND 9 is an implementation of the Domain Name System (DNS) protocols.
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The named(8) daemon is an Internet Domain Name Server. The libdns
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library is a library of DNS protocol support functions.
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II. Problem Description
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Due to a software defect a specially crafted query which includes
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malformed rdata, could cause named(8) to crash with an assertion
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failure and rejecting the malformed query. This issue affects both
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recursive and authoritative-only nameservers.
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III. Impact
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An attacker who can send a specially crafted query could cause named(8)
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to crash, resulting in a denial of service.
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IV. Workaround
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No workaround is available, but systems not running the named(8) service
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and not using the base system DNS utilities are not affected.
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V. Solution
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Perform one of the following:
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1) Upgrade your vulnerable system to a supported FreeBSD stable or
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release / security branch (releng) dated after the correction date.
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2) To update your vulnerable system via a source code patch:
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The following patches have been verified to apply to the applicable
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FreeBSD release branches.
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a) Download the relevant patch from the location below, and verify the
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detached PGP signature using your PGP utility.
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# fetch http://security.FreeBSD.org/patches/SA-13:07/bind.patch
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# fetch http://security.FreeBSD.org/patches/SA-13:07/bind.patch.asc
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# gpg --verify bind.patch.asc
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b) Execute the following commands as root:
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# cd /usr/src
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# patch < /path/to/patch
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Recompile the operating system using buildworld and installworld as
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described in <URL:http://www.FreeBSD.org/handbook/makeworld.html>.
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Restart the named daemon, or reboot the system.
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3) To update your vulnerable system via a binary patch:
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Systems running a RELEASE version of FreeBSD on the i386 or amd64
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platforms can be updated via the freebsd-update(8) utility:
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# freebsd-update fetch
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# freebsd-update install
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VI. Correction details
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The following list contains the correction revision numbers for each
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affected branch.
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Branch/path Revision
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- -------------------------------------------------------------------------
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stable/8/ r253696
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releng/8.4/ r253692
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stable/9/ r253695
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releng/9.1/ r253693
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- -------------------------------------------------------------------------
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To see which files were modified by a particular revision, run the
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following command, replacing XXXXXX with the revision number, on a
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machine with Subversion installed:
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# svn diff -cXXXXXX --summarize svn://svn.freebsd.org/base
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Or visit the following URL, replacing XXXXXX with the revision number:
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<URL:http://svnweb.freebsd.org/base?view=revision&revision=XXXXXX>
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VII. References
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https://kb.isc.org/article/AA-01015
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<URL:http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2013-4854>
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The latest revision of this advisory is available at
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http://security.FreeBSD.org/advisories/FreeBSD-SA-13:07.bind.asc
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