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Subject: Caldera Security Advisory 1997.16: Vulnerability in BIND

Caldera Security Advisory SA-1997.16
28-Aug-1997

Topic: Vulnerability in BIND

I. Problem Description

  As announced in CERT Security Advisory CA-97.22.bind, there are a
  number of vulnerabilities in releases of BIND prior to BIND 8.1.1. 

II. Impact

  On systems such as Caldera OpenLinux 1.1, an unprivileged
  user from a remote host can corrupt name server caches to
  their advantage. This allows the user to insert any address
  specified into the DNS cache allowing false but meaningful
  address resolution.

        Though this vulnerability was fixed in BIND 4.9.6, it is recommended 
  to upgrade to the current release to eliminate future exploitation of 
  vulnerabilities that are not currently public knowledge.

        This problem was present on the following OpenLinux releases:
                CND 1.0
                Base 1.0
                Lite 1.1
                Base 1.1
                Standard 1.1

  To determine if you are affected and need this update you may do the
  following:
                rpm -q bind
        If the results show the system using a BIND release prior to 8.1.1 then
  you will need to update.

III. Solution

  The proper solution is to update to the new 8.1.1 package that
  contains the fixed versions of the bind name server.  They are
  located on Caldera's FTP server (ftp.caldera.com):

  /pub/openlinux/updates/1.1/current/RPMS/ for the binaries.
  /pub/openlinux/updates/1.1/current/SRPMS/ for the sources.

  The following instructions assume an UPDATE and not an install.

        The update to the new package is as follows:
        1) Check to see if bind DNS server is currently running.
           ps -eax | grep named
                If ps shows named running, stop "named" by running:
                /etc/rc.d/init.d/named stop

        2) Update the old package by using the following command.
           rpm -U RPMS/bind-8.1.1-2.i386.rpm

        3) Update the utils and doc files.
           rpm -U RPMS/bind-doc-8.1.1-2.i386.rpm
           rpm -U RPMS/bind-utils-8.1.1-2.i386.rpm

        4) If bind DNS server: "named" was previously running, it is now time
    to restart "named" by running:

    /etc/rc.d/init.d/named start

        You will see the following message displayed:

                Starting bind DNS server: named

  Note: These RPM files can be installed on a system not having
  a previous version of BIND. Be aware that the configuration
  syntax has changed in this version. Futher information
  on the configuration syntax can be found in the following
  html page upon installation of bind-doc-8.1.1-2.i386.rpm:
  /usr/doc/bind-8.1.1/html/config.html

  BIND 4.9.x configuration files can be converted to the new format
  by using /usr/sbin/named-bootconf, a perl script that is part
  of the BIND 8.1 source kit.

  The MD5 sums for the BIND packages are as follows:

  a10921c6856df5150ebfed9f57e0f284  RPMS/bind-8.1.1-2.i386.rpm
  57d80ac82b8ff483526d93d08d24f3ec  RPMS/bind-doc-8.1.1-2.i386.rpm
  404d6fb04c8881d21577ced8a8553597  RPMS/bind-utils-8.1.1-2.i386.rpm
  7944b78257ed512818e4942e96f8c341  SRPMS/bind-8.1.1-2.src.rpm

IV. Release Notes

  The following improvements have been made since the previous release:

  * Dynamic Updates (RFC 2136) 
  * DNS Change Notification (RFC 1996) 
  * Completely new configuration syntax 
  * Flexible, categorized logging system 
  * IP-address-based access control for queries, zone transfers, 
    and updates that may be specified on a zone-by-zone basis
  * More efficient zone transfers 
  * Improved performance for servers with thousands of zones 
  * The server no longer forks for outbound zone transfers 
  * Many bug fixes 
  (From /usr/doc/bind-8.1.1/html/index.html upon updating the DOC files)

V. References

  This and other Caldera security resources are located at:

    http://www.caldera.com/tech-ref/security/

  Additional documentation on this problem can be found at:

    http://www.secnet.com/nav1.html

  CERT Security Advisory CA-97.22.bind:

    ftp://info.cert.org/pub/cert_advisories/CA-97.22.bind

VI. PGP Signature

  This message was signed with the PGP key for <security@caldera.com>.

  This key can be obtained from:
    ftp://ftp.caldera.com/pub/pgp-keys/

  Or on an OpenLinux CDROM under:
    /OpenLinux/pgp-keys/

  $Id: SA-1997.16,v 1.1 1997/09/09 17:25:39 ron Exp $

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