-----BEGIN PGP SIGNED MESSAGE----- CERT Advisory CA-2002-15 Denial-of-Service Vulnerability in ISC BIND 9 Original release date: June 04, 2002 Last revised: -- Source: CERT/CC A complete revision history can be found at the end of this file. Systems Affected * Domain Name System (DNS) servers running ISC BIND 9 prior to 9.2.1 Because the normal operation of most services on the Internet depends on the proper operation of DNS servers, other services could be affected if this vulnerability is exploited. Overview A denial-of-service vulnerability exists in version 9 of the Internet Software Consortium's (ISC) Berkeley Internet Name Domain (BIND) server. ISC BIND versions 8 and 4 are not affected. Exploiting this vulnerability will cause the BIND server to shut down. I. Description BIND is an implementation of the Domain Name System (DNS) that is maintained by the ISC. A vulnerability exists in version 9 of BIND that allows remote attackers to shut down BIND servers. An attacker can cause the shutdown by sending a specific DNS packet designed to trigger an internal consistency check. However, this vulnerability will not allow an attacker to execute arbitrary code or write data to arbitrary locations in memory. The internal consistency check that triggers the shutdown occurs when the rdataset parameter to the dns_message_findtype() function in message.c is not NULL as expected. The condition causes the code to assert an error message and call abort() to shut down the BIND server. It is also possible to accidentally trigger this vulnerability using common queries found in routine operation, especially queries originating from SMTP servers. A vulnerability note describing this problem can be found at http://www.kb.cert.org/vuls/id/739123. This vulnerability note includes a list of vendors that have been contacted about this vulnerability. This vulnerability is also being referenced as CAN-2002-0400: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2002-0400 II. Impact Exploitation of this vulnerability will cause the BIND server to abort and shut down. As a result, the BIND server will not be available unless it is restarted. III. Solution Apply a patch from your vendor The ISC has released BIND version 9.2.1. The CERT/CC recommends that users of BIND 9 apply a patch from their vendor or upgrade to BIND 9.2.1. Appendix A. - Vendor Information This appendix contains information provided by vendors for this advisory. As vendors report new information to the CERT/CC, we will update this section and note the changes in our revision history. If a particular vendor is not listed below, we have not received their comments. Apple The version of BIND that ships in Mac OS X and Mac OS X Server does not contain this vulnerability. BSDI Wind River Systems, Inc. does not include BIND 9 with any version of BSD/OS. Caldera SCO OpenServer from Caldera does not ship BIND9, and is therefore not vulnerable. Caldera Open UNIX does ship BIND9, and is vulnerable. We are investigating. Caldera OpenLinux does not ship BIND9, and is therefore not vulnerable. Compaq Computer Corporation HP Alpha Server Products: HP Tru64 UNIX: Tru64 UNIX is not vulnerable to this reported problem. HP Tru64 UNIX ships with BIND 8.2.2-p5 TCP/IP for HP OpenVms: TCP/IP for HP OpenVms is not vulnerable to this reported problem.The current versions of TCP/IP for HP OpenVMS ship BIND 8.2.2-p5 HP NonStop Server: "HP NonStop Himalaya is not vulnerable to this problem. The 'named' function of Domain Name Server (T6021) which is implemented for HP NonStop Himalaya is based on BIND 4.8. NonStop DNS is the only Himalaya software product that includes 'named'." Cray Cray, Inc. is not vulnerable since the BIND distributed with Unicos and Unicos/mk is not based on BIND 9. Engarde Guardian Digital does not ship BIND 9 in any versions of EnGarde Secure Linux, therefore we are not vulnerable. All versions were shipped with BIND 8. F5 Networks, Inc. F5 Networks' products do not include BIND 9, and are therefore not affected by this vulnerability. FreeBSD The FreeBSD base system does not ship with ISC BIND 9. However, ISC BIND 9 is available in the FreeBSD Ports Collection. It is currently at version 9.2.1 and is therefore unaffected. Hewlett-Packard Company HP is Vulnerable, Solution investigation continuing.. IBM After analysis of the affected component, IBM has determined that the AIX bind deamon is not vulnerable to the attack as described in the CERT advisory. Internet Software Consortium This vulnerability was found through routine bug analysis. BIND 9 is designed to exit when it detects an internal consistency error to reduce the impact of bugs in the server. ISC strongly reccomends that all BIND 9 users upgrade immediately to 9.2.1. BIND 9.2.1 can be found at http://www.isc.org/products/BIND/bind9.html. MandrakeSoft Mandrake Linux 8.x ships with BIND9 and as such updated packages will be available as early as possible. Microsoft Corporation Microsoft has reviewed the information and can confirm that our products are not affected by this vulnerability. NEC Corporation sent on June 3, 2002 [Server Products] * EWS/UP 48 Series operating system - is NOT vulnerable. NetBSD NetBSD has not included Bind 9 in the base system of any release or -current development branch. Bind 9 is available from the 3rd party software system, pkgsrc. Users who have installed net/bind9 or net/bind9-current should update to a fixed version. pkgsrc/security/audit-packages can be used to keep up to date with these types of issues. Network Appliance All NetApp products do not contain any BIND code, so no NetApp product is vulnerable to this problem. Nortel Networks Limited Nortel Networks is reviewing its portfolio to determine if any products are affected by the vulnerability noted in CERT Advisory CA-2002-15. A definitive statement will be issued shortly. Red Hat Red Hat distributed BIND 9 in Red Hat Linux versions 7.1, 7.2, and 7.3. We are currently working on producing errata packages, when complete these will be available along with our advisory at the URL below. At the same time users of the Red Hat Network will be able to update their systems using the 'up2date' tool. http://rhn.redhat.com/errata/RHSA-2002-105.html Silicon Graphics, Inc. IRIX does not ship with BIND9 and is not vulnerable. Sun Microsystems Sun does not ship BIND 9 with any version of Solaris at this time and is therefore not affected by this issue. SuSE, Inc. We are affected by the bind9 DoS issue as well. All of our currently supported SuSE Linux products come with a bind9 package. We will release an announcement for the issue, coordinated with your timeframe and not before we see your official announcement. Unisphere Networks, Inc. The Unisphere Networks ERX family of edge routers does not implement a DNS server or named daemon within the Unison OS. Additionally, the DNS client found on the ERX is not based on the ISC BIND code. Unisphere Networks has no reason to expect a similar problem exists in the DNS client implementation found on the ERX. _________________________________________________________________ The CERT Coordination Center thanks the Internet Software Consortium for notifying us about this vulnerability. _________________________________________________________________ Author: Ian A. Finlay ______________________________________________________________________ This document is available from: http://www.cert.org/advisories/CA-2002-15.html ______________________________________________________________________ CERT/CC Contact Information Email: firstname.lastname@example.org Phone: +1 412-268-7090 (24-hour hotline) Fax: +1 412-268-6989 Postal address: CERT Coordination Center Software Engineering Institute Carnegie Mellon University Pittsburgh PA 15213-3890 U.S.A. CERT/CC personnel answer the hotline 08:00-17:00 EST(GMT-5) / EDT(GMT-4) Monday through Friday; they are on call for emergencies during other hours, on U.S. holidays, and on weekends. Using encryption We strongly urge you to encrypt sensitive information sent by email. Our public PGP key is available from http://www.cert.org/CERT_PGP.key If you prefer to use DES, please call the CERT hotline for more information. Getting security information CERT publications and other security information are available from our web site http://www.cert.org/ To subscribe to the CERT mailing list for advisories and bulletins, send email to email@example.com. Please include in the body of your message subscribe cert-advisory * "CERT" and "CERT Coordination Center" are registered in the U.S. Patent and Trademark Office. ______________________________________________________________________ NO WARRANTY Any material furnished by Carnegie Mellon University and the Software Engineering Institute is furnished on an "as is" basis. Carnegie Mellon University makes no warranties of any kind, either expressed or implied as to any matter including, but not limited to, warranty of fitness for a particular purpose or merchantability, exclusivity or results obtained from use of the material. Carnegie Mellon University does not make any warranty of any kind with respect to freedom from patent, trademark, or copyright infringement. _________________________________________________________________ Conditions for use, disclaimers, and sponsorship information Copyright 2002 Carnegie Mellon University. Revision History June 04, 2002: Initial release -----BEGIN PGP SIGNATURE----- Version: PGP 6.5.8 iQCVAwUBPP0kn6CVPMXQI2HJAQFEyQP/fkgF01EWoE2JPDB3kPwLhSUSrM8XHNvQ +vfuH8ZSUAiG0/g/zSGjeTt0NFYeeI6kMS7MQqS76ECaP93l7gR/zucShEkOKliy 4NHjoF34gPqPlDu6BAdh2xfl9q+LNdu8EHs8rjl1FqjvPKmL436tS0ToJXqXDpmx /WHO3P3AwhM= =M/6l -----END PGP SIGNATURE-----
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