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             AUSCERT External Security Bulletin Redistribution

     ESB-2003.0821 -- Sun(sm) Alert Notification - Sun Alert ID: 57434
   Remote Denial-Of-Service Vulnerability in BIND DNS Daemon (in.named)
                             28 November 2003

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:                BIND 8.4
Publisher:              Sun Microsystems
Operating System:       Solaris 9
                        Solaris 8
                        Solaris 7
Platform:               SPARC
                        IA-32
Impact:                 Denial of Service
Access Required:        Remote
CVE Names:              CAN-2003-0914

Ref:                    ESB-2003.0819

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   DOCUMENT ID: 57434
   SYNOPSIS: Remote Denial-Of-Service Vulnerability in BIND DNS Daemon
   (in.named)
   DETAIL DESCRIPTION:
   
Sun(sm) Alert Notification

     * Sun Alert ID: 57434
     * Synopsis: Remote Denial-Of-Service Vulnerability in BIND DNS
       Daemon (in.named)
     * Category: Security
     * Product: Solaris
     * BugIDs: 4928758
     * Avoidance: Workaround
     * State: Committed
     * Date Released: 26-Nov-2003
     * Date Closed:
     * Date Modified:
       
1. Impact

   A privileged remote user may be able to cause the Domain Name Service
   Daemon (in.named(1M)) to retain invalid negative responses. This will
   cause DNS resolver routines (resolver(3RESOLV)) to not find valid host
   names. This is a type of Denial-of-Service.
   
   This issue corresponds to the security fix addressed in ISC BIND 8.4.2
   and8.3.7 releases and is mentioned here:
   [1]http://www.isc.org/products/BIND/bind8.html
   
2. Contributing Factors

   This issue can occur in the following releases:
   
   SPARC Platform
     * Solaris 7
     * Solaris 8
     * Solaris 9
       
   x86 Platform
     * Solaris 7
     * Solaris 8
     * Solaris 9
       
   Note: Solaris 2.6 will not be evaluated regarding the potential impact
   of the issue described in this Sun Alert.
   
3. Symptoms

   Should the described issue occur, applications will fail to connect to
   remote servers.
   
   nslookup(1m) intermittently reports that the host name is
   "Non-existent". For example:
    $ nslookup www.sun.com
    Server:  dns.Sun.COM
    Address:  192.168.192.168
    dns.Sun.COM can't find www.sun.com: Non-existent host/domain


   SOLUTION SUMMARY:
   
4. Relief/Workaround

   To work around the described issue, place required host information in
   another name repository, such as "files" (in "/etc/hosts") and modify
   nsswitch.conf(4) accordingly. See [2]http://docs.sun.com/ for further
   information.
   
5. Resolution

   A final resolution is pending completion.
   
   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 2000-2003 Sun Microsystems, Inc., 4150 Network Circle, Santa
   Clara, CA 95054 U.S.A. All rights reserved.
   

References

   1. http://www.isc.org/products/BIND/bind8.html
   2. http://docs.sun.com/

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