#240048: DUPLICATE of Sun Alert 239392 - Security Vulnerability in the DNS Protocol may lead to DNS Cache Poisoning

DUPLICATE of Sun Alert 239392 - Security Vulnerability in the DNS Protocol may lead to DNS Cache Poisoning

Category :	Security
Release Phase :	Resolved
Bug Id :	6702096
Product :	Solaris 8 Operating System Solaris 9 Operating System Solaris 10 Operating System OpenSolaris
Date of Workaround Release :	28-Jul-2008
Date of Resolved Release :	08-Aug-2008

DUPLICATE of Sun Alert 239392 - Security Vulnerability in the DNS Protocol may lead to DNS Cache Poisoning

1. Impact

This Sun Alert is a DUPLICATE to Sun Alert 239392, originally issued July 8th, 2008 as an Update.

A security vulnerability in the DNS protocol may allow remote unprivileged users to cause named(1M) to return incorrect addresses for Internet hosts, thereby redirecting end users to unintended hosts or services.

This issue is also referenced in the following documents:

US-CERT Vulnerability Note VU#800113 at http://www.kb.cert.org/vuls/id/800113
CVE-2008-1447 at http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-1447

2. Contributing Factors

This issue can occur in the following releases:

SPARC Platform

Solaris 8 without patch 109326-23
Solaris 9 without patch 112837-15
Solaris 10 without patch 119783-06
OpenSolaris based upon builds snv_01 through snv_94

x86 Platform

Solaris 8 without patch 109327-23
Solaris 9 without patch 114265-14
Solaris 10 without patch 119784-06
OpenSolaris based upon builds snv_01 through snv_94

OpenSolaris distributions may include additional bug fixes above and beyond the base build from which it was derived. The base build can be derived as follows:

$ uname -a
SunOS  phys-node-1 5.11 snv_94 i86pc i386 i86pc

Only systems with the BIND named(1M) service enabled are impacted by this issue. To verify if BIND is running on a system, the following command can be used:

$ ps -e | grep in.named && echo "BIND is running

3. Symptoms

There are no predictable symptoms that would indicate the described issue has occurred.

4. Workaround

Please refer to section III, "Solution", of CERT VU#800113, in particular the following headings: "Restrict access", "Filter traffic at network perimeters" and Disable recursion:

http://www.kb.cert.org/vuls/id/800113

5. Resolution

This issue is addressed in the following releases:

SPARC Platform

Solaris 8 with patch 109326-23 or later
Solaris 9 with patch 112837-15 or later
Solaris 10 with patch 119783-06 or later
OpenSolaris based upon builds snv_95 or later

x86 Platform

Solaris 8 with patch 109327-23 or later
Solaris 9 with patch 114265-14 or later
Solaris 10 with patch 119784-06 or later
OpenSolaris based upon builds snv_95 or later

Note 1: The above patches implement mitigation strategies within the implementation of the DNS protocol, specifically source port randomization and query ID randomization making BIND 9 more resilient to an attack. It does not, however, completely remove the possibility of exploitation of this issue.

The full resolution is for DNS Security Extensions (DNSSEC) to be implemented Internet-wide. DNS zone administrators should start signing their zones.

If your site's parent DNS zone is not signed you can register with the ISC's DNSSEC Look-aside Validation (DLV) registry at the following URL:

https://secure.isc.org/ops/dlv/

Further details on configuring your DNA zones for DNSSEC is available from the ISC at the following URL:

http://www.isc.org/sw/bind/docs/DNSSEC_in_6_minutes.pdf

Note 2: BIND as provided with Solaris 8 is not DNSSEC capable and thus Sun recommends updating Solaris 8 systems acting as DNS servers to Solaris 10 or later.

Note 3: After installation of the above mentioned patches the named(1M) configuration file, by default /etc/named.conf, MUST not have the "query-source" or "query-source-v6" option configured. These options instruct the name server to use only the port configured for outbound queries which means the source port will not be randomized. When disabling these options note that some firewall configuration may be necessary to allow the name server to work though the firewall.

For more information on Security Sun Alerts, see Technical Instruction ID 213557.

This Sun Alert notification is being provided to you on an "AS IS" basis. This Sun Alert notification may contain information provided by third parties. The issues described in this Sun Alert notification may or may not impact your system(s). Sun makes no representations, warranties, or guarantees as to the information contained herein. ANY AND ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT, ARE HEREBY DISCLAIMED. BY ACCESSING THIS DOCUMENT YOU ACKNOWLEDGE THAT SUN SHALL IN NO EVENT BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, PUNITIVE, OR CONSEQUENTIAL DAMAGES THAT ARISE OUT OF YOUR USE OR FAILURE TO USE THE INFORMATION CONTAINED HEREIN. This Sun Alert notification contains Sun proprietary and confidential information. It is being provided to you pursuant to the provisions of your agreement to purchase services from Sun, or, if you do not have such an agreement, the Sun.com Terms of Use. This Sun Alert notification may only be used for the purposes contemplated by these agreements.

Copyright 2000-2008 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, CA 95054 U.S.A. All rights reserved.

Modification History

08-Jul-2008: Originally released as Sun Alert 239392
15-Jul-2008: Updated Workaround and Resolution sections
17-Jul-2008: Updated Workaround section
28-Jul-2008: Updated version of 239392 released as Sun Alert 240048
08-Aug-20-08: Updated Contributing Factors and Resolution sections, DUPLICATE of original Sun Alert 239392 for this issue; now Resolved

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