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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2008.0684 -- [Solaris] Solaris BIND - Security Vulnerability in the DNS Protocol may lead to DNS Cache Poisoning 11 August 2008 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: BIND Publisher: Sun Microsystems Operating System: Solaris Impact: Provide Misleading Information Access: Remote/Unauthenticated CVE Names: CVE-2008-1447 Ref: AL-2008.0080 Original Bulletin: http://sunsolve.sun.com/search/printfriendly.do?assetkey=1-66-239392-1 Revision History: August 11 2008: Updates Patches July 30 2008: Workaround section updated July 10 2008: Initial Release - --------------------------BEGIN INCLUDED TEXT-------------------- Solution Type: Sun Alert Solution 239392 : Security Vulnerability in the DNS Protocol may lead to DNS Cache Poisoning Bug ID: 6702096 Product Solaris 8 Operating System Solaris 9 Operating System Solaris 10 Operating System OpenSolaris Date of Workaround Release: 08-Jul-2008 Date of Resolved Release: 08-Aug-2008 SA Document Body Security Vulnerability in the DNS Protocol may lead to DNS Cache Poisoning 1. Impact 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 - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. If you do not know who that is, please send an email to auscert@auscert.org.au and we will forward your request to the appropriate person. NOTE: Third Party Rights This security bulletin is provided as a service to AusCERT's members. As AusCERT did not write the document quoted above, AusCERT has had no control over its content. The decision to follow or act on information or advice contained in this security bulletin is the responsibility of each user or organisation, and should be considered in accordance with your organisation's site policies and procedures. AusCERT takes no responsibility for consequences which may arise from following or acting on information or advice contained in this security bulletin. NOTE: This is only the original release of the security bulletin. It may not be updated when updates to the original are made. If downloading at a later date, it is recommended that the bulletin is retrieved directly from the author's website to ensure that the information is still current. Contact information for the authors of the original document is included in the Security Bulletin above. If you have any questions or need further information, please contact them directly. Previous advisories and external security bulletins can be retrieved from: http://www.auscert.org.au/render.html?cid=1980 If you believe that your computer system has been compromised or attacked in any way, we encourage you to let us know by completing the secure National IT Incident Reporting Form at: http://www.auscert.org.au/render.html?it=3192 =========================================================================== Australian Computer Emergency Response Team The University of Queensland Brisbane Qld 4072 Internet Email: auscert@auscert.org.au Facsimile: (07) 3365 7031 Telephone: (07) 3365 4417 (International: +61 7 3365 4417) AusCERT personnel answer during Queensland business hours which are GMT+10:00 (AEST). On call after hours for member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iQCVAwUBSJ+u1Sh9+71yA2DNAQI8KgP+K1rtboCxCZo92SVSvf+T+PD1IzKe6jq3 D1JOCyFWS81xtcG0/Uz6ItVL/nG3dsKBS9DNPurcEZUQ8GVe0mdcwlA8VsnzzJ8b 0AIHASsIapSa+qzA5nbPDlpnJQuwubN3AOVa5OAZhfL8YpFIsASe7WBGCNzTwzd2 ylb7cYB428s= =sL6E -----END PGP SIGNATURE-----