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AUSCERT External Security Bulletin Redistribution
ESB-2009.1114
BIND named dynamic update Denial of Service vulnerability
30 July 2009
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: bind
Publisher: NetBSD
Operating System: NetBSD
Impact/Access: Denial of Service -- Remote/Unauthenticated
Resolution: Patch
CVE Names: CVE-2009-0696
Reference: ASB-2009.1033
Original Bulletin:
http://ftp.NetBSD.org/pub/NetBSD/security/advisories/NetBSD-SA2009-013.txt.asc
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NetBSD Security Advisory 2009-013
=================================
Topic: BIND named dynamic update Denial of Service vulnerability
Version: NetBSD-current: affected prior to 2009-07-29
NetBSD 5.0: affected
NetBSD 4.0.*: affected
NetBSD 4.0: affected
pkgsrc: bind package prior to 9.5.1pl3 and 9.6.1pl1
Severity: Denial of Service
Fixed: NetBSD-current: July 28, 2009 21:13 UTC
NetBSD-5-0 branch: July 28, 2009 22:26 UTC
NetBSD-5 branch: July 28, 2009 22:26 UTC
NetBSD-4-0 branch: July 28, 2009 22:19 UTC
NetBSD-4 branch: July 28, 2009 22:19 UTC
pkgsrc 2009Q2: bind-9.5.1pl3 and bind-9.6.1pl1 corrects this issue
Please note that NetBSD releases prior to 4.0 are no longer supported.
It is recommended that all users upgrade to a supported release.
Abstract
========
An assertion failure in the Berkeley Internet Name Domain server
software shipped in NetBSD can be used by a remote attacker to
cause the server process to crash by sending specially crafted
dynamic update messages.
This vulnerability has been assigned CVE-2009-0696 and CERT
Vulnerability Note VU#725188.
Technical Details
=================
An error handling dynamic DNS update packets with the record data
type being set to "ANY" will cause an assertion in the
dns_db_findrdataset() function to trigger, causing the name server
to exit. This requires at least one of the record set entries
specified in the update to exist on the local server.
The assertion triggered will typically cause the following message:
db.c:659: REQUIRE(type != ((dns_rdatatype_t)dns_rdatatype_any)) failed
exiting (due to assertion failure).
Note that this assertion will be triggered even if dynamic DNS
updates are disabled.
Solutions and Workarounds
=========================
In order to avoid this vulnerability, either filter incoming dynamic
DNS update requests using a firewall or upgrade your bind software
to a non-vulnerable version.
The following instructions describe how to upgrade your bind binaries
by updating your source tree and rebuilding and installing a new
version of bind.
* NetBSD-current:
Systems running NetBSD-current dated from before 2009-07-28
21:13 UTC should be upgraded to NetBSD-current dated
2009-07-28 21:13 UTC or later.
The following files/directories need to be updated from the
netbsd-current CVS branch (aka HEAD):
external/bsd/bind/dist
To update from CVS, re-build, and re-install bind:
# cd src
# cvs update -d -P external/bsd/bind/dist
# cd external/bsd/bind/bin/named
# make USETOOLS=no cleandir dependall
# make USETOOLS=no install
* NetBSD 5.*:
Systems running NetBSD 5.* sources dated from before
2009-07-28 22:26 UTC should be upgraded from NetBSD 5.*
sources dated 2009-07-28 22:26 UTC or later.
The following files/directories need to be updated from the
netbsd-5 or netbsd-5-0 branches:
dist/bind/bin/named/update.c
To update from CVS, re-build, and re-install bind:
# cd src
# cvs update -r <branch_name> -d -P dist/bind/bin/named/update.c
# cd usr.sbin/bind/named
# make USETOOLS=no cleandir dependall
# make USETOOLS=no install
* NetBSD 4.*:
Systems running NetBSD 4.* sources dated from before
2009-07-28 22:19 UTC should be upgraded from NetBSD 4.* sources
dated 2009-07-28 22:19 UTC or later.
The following files/directories need to be updated from the
netbsd-4 or netbsd-4-0 branches:
dist/bind/bin/named/update.c
To update from CVS, re-build, and re-install bind:
# cd src
# cvs update -r <branch_name> -d -P dist/bind/bin/named/update.c
# cd usr.sbin/bind/named
# make USETOOLS=no cleandir dependall
# make USETOOLS=no install
Thanks To
=========
Matthias Urlichs for finding and reporting this bug and Christos Zoulas
for fixing it in NetBSD.
Revision History
================
2009-07-29 Initial release
More Information
================
Advisories may be updated as new information becomes available.
The most recent version of this advisory (PGP signed) can be found at
http://ftp.NetBSD.org/pub/NetBSD/security/advisories/NetBSD-SA2009-013.txt.asc
Information about NetBSD and NetBSD security can be found at
http://www.NetBSD.org/ and http://www.NetBSD.org/Security/.
Copyright 2009, The NetBSD Foundation, Inc. All Rights Reserved.
Redistribution permitted only in full, unmodified form.
$NetBSD: NetBSD-SA2009-013.txt,v 1.1 2009/07/29 06:54:37 tonnerre Exp $
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