what you don't know can hurt you

FreeBSD Security Advisory - BIND Denial Of Service

FreeBSD Security Advisory - BIND Denial Of Service
Posted Jul 8, 2015
Site security.freebsd.org

FreeBSD Security Advisory - BIND 9 is an implementation of the Domain Name System (DNS) protocol. The named daemon is an Internet Domain Name Server. The libdns library is a library of DNS protocol support functions. Due to a software defect, specially constructed zone data could cause named to crash with an assertion failure and rejecting the malformed query when DNSSEC validation is enabled. An attacker who can cause specific queries to be sent to a nameserver could cause named to crash, resulting in a denial of service.

tags | advisory, denial of service, protocol
systems | freebsd
advisories | CVE-2015-4620
MD5 | 300c3c2b2e911068922e33304424c3ae

FreeBSD Security Advisory - BIND Denial Of Service

Change Mirror Download
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA512

=============================================================================
FreeBSD-SA-15:11.bind Security Advisory
The FreeBSD Project

Topic: BIND resolver remote denial of service when validating

Category: contrib
Module: bind
Announced: 2015-07-07
Credits: ISC
Affects: FreeBSD 8.4 and FreeBSD 9.3.
Corrected: 2015-07-07 21:43:23 UTC (stable/9, 9.3-STABLE)
2015-07-07 21:44:01 UTC (releng/9.3, 9.3-RELEASE-p19)
2015-07-07 21:43:23 UTC (stable/8, 8.4-STABLE)
2015-07-07 21:44:01 UTC (releng/8.4, 8.4-RELEASE-p33)
CVE Name: CVE-2015-4620

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

BIND 9 is an implementation of the Domain Name System (DNS) protocol.
The named(8) daemon is an Internet Domain Name Server. The libdns
library is a library of DNS protocol support functions.

II. Problem Description

Due to a software defect, specially constructed zone data could cause
named(8) to crash with an assertion failure and rejecting the malformed
query when DNSSEC validation is enabled.

III. Impact

An attacker who can cause specific queries to be sent to a nameserver
could cause named(8) to crash, resulting in a denial of service.

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.

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

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-15:11/bind-9.patch
# fetch https://security.FreeBSD.org/patches/SA-15:11/bind-9.patch.asc
# gpg --verify bind-9.patch.asc

[FreeBSD 8.4]
# fetch https://security.FreeBSD.org/patches/SA-15:11/bind-8.patch
# fetch https://security.FreeBSD.org/patches/SA-15:11/bind-8.patch.asc
# gpg --verify bind-8.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/8/ r285257
releng/8.4/ r285258
stable/9/ r285257
releng/9.3/ r285258
- -------------------------------------------------------------------------

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://kb.isc.org/article/AA-01267/>

<URL:https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-4620>

The latest revision of this advisory is available at
<URL:https://security.FreeBSD.org/advisories/FreeBSD-SA-15:11.bind.asc>
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v2.1.5 (FreeBSD)
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=SVcF
-----END PGP SIGNATURE-----

Comments

RSS Feed Subscribe to this comment feed

No comments yet, be the first!

Login or Register to post a comment

File Archive:

March 2019

  • Su
  • Mo
  • Tu
  • We
  • Th
  • Fr
  • Sa
  • 1
    Mar 1st
    15 Files
  • 2
    Mar 2nd
    5 Files
  • 3
    Mar 3rd
    3 Files
  • 4
    Mar 4th
    25 Files
  • 5
    Mar 5th
    20 Files
  • 6
    Mar 6th
    16 Files
  • 7
    Mar 7th
    17 Files
  • 8
    Mar 8th
    12 Files
  • 9
    Mar 9th
    3 Files
  • 10
    Mar 10th
    4 Files
  • 11
    Mar 11th
    23 Files
  • 12
    Mar 12th
    12 Files
  • 13
    Mar 13th
    12 Files
  • 14
    Mar 14th
    19 Files
  • 15
    Mar 15th
    12 Files
  • 16
    Mar 16th
    3 Files
  • 17
    Mar 17th
    1 Files
  • 18
    Mar 18th
    15 Files
  • 19
    Mar 19th
    22 Files
  • 20
    Mar 20th
    14 Files
  • 21
    Mar 21st
    8 Files
  • 22
    Mar 22nd
    0 Files
  • 23
    Mar 23rd
    0 Files
  • 24
    Mar 24th
    0 Files
  • 25
    Mar 25th
    0 Files
  • 26
    Mar 26th
    0 Files
  • 27
    Mar 27th
    0 Files
  • 28
    Mar 28th
    0 Files
  • 29
    Mar 29th
    0 Files
  • 30
    Mar 30th
    0 Files
  • 31
    Mar 31st
    0 Files

Top Authors In Last 30 Days

File Tags

Systems

packet storm

© 2019 Packet Storm. All rights reserved.

Services
Security Services
Hosting By
Rokasec
close