Operating System:

Published:

30 November 1999

Protect yourself against future threats.

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===========================================================================
              AUSCERT External Security Bulletin Redistribution
                             
               ESB-1999.181 -- SGI Security Advisory 19991108
                            BIND Vulnerabilities
                              01 December 1999

===========================================================================

Silicon Graphics Inc. has released the following advisory concerning 
multiple BIND vulnerabilities as referenced in CERT Advisory CERT CA-99-14
and AusCERT External Security Bulletin ESB-1999.170.

Remote users may execute arbitrary code with the privilege of the named 
daemon or impair normal operation of the daemon on systems with vulnerable 
versions of BIND.  The vulnerability for SGI operating systems:  IRIX,
UNICOS and SGI Linux depends on which BIND distribution version was
installed.  A table of vulnerabilities and SGI BIND versions may be found
in the Advisory included below.

Under certain circumstances these vulnerabilities may allow remote users
to gain root access or to perform Denial of Service (DoS) attacks against
vulnerable systems.


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______________________________________________________________________________
                          SGI Security Advisory

        Title:   BIND Vulnerabilities
        Title:   CERT CA-99-14
        Number:  19991101-01-I
        Date:    November 30, 1999
______________________________________________________________________________

SGI provides this information freely to the SGI user community for its
consideration, interpretation, implementation and use.   SGI recommends
that this information be acted upon as soon as possible.

SGI provides the information in this Security Advisory on an "AS-IS" basis
only, and disclaims all warranties with respect thereto, express, implied
or otherwise, including, without limitation, any warranty of merchantability
or fitness for a particular purpose.  In no event shall SGI be liable for
any loss of profits, loss of business, loss of data or for any indirect,
special, exemplary, incidental or consequential damages of any kind arising
from your use of, failure to use or improper use of any of the instructions
or information in this Security Advisory.
______________________________________________________________________________


As a followup to the CERT(sm) Advisory CA-99-14
"CERT® Advisory CA-99-14 Multiple Vulnerabilities in BIND",
SGI has investigated and provides the following information.


- - -----------------------
- - --- Issue Specifics ---
- - -----------------------

The BIND distribution provides Internet domain name service known as DNS.

ISC and CERT have reported several vulnerabilities discovered in
certain versions of BIND distributions.  These vulnerabilities can be
used to perform denial of service attacks and/or to obtain privileged
access remotely.

SGI has investigated the issue and provides the following information for
customer interpretation and possible action.


- - --------------
- - --- Impact ---
- - --------------

SGI distributes BIND for all SGI operating systems:  IRIX, UNICOS
and SGI Linux.  Vulnerability exposure depends on which BIND distribution
version was installed.  A table of vulnerabilities and BIND versions
can be found on: http://www.isc.org/products/BIND/bind-security-19991108.html

SGI distributes BIND 4.9.7 on IRIX as eoe.sw.named which is not loaded
by default on IRIX systems. The named(1M) man page incorrectly states "This
version is based on the BIND 4.9.4 patchlevel 1 release from Paul Vixie."
This version of BIND can lead to a denial of service.

SGI distributes BIND 8.2.1 on http://freeware.sgi.com/ for IRIX.
This version of BIND can lead to a denial of service and remote access.

SGI distributes BIND 4.9.3 on UNICOS on Cray systems.
This version of BIND can lead to a denial of service.

SGI distributes BIND 8.2 on SGI Linux 1.0/1.1 which is based on RedHat 6.0.
This version of BIND can lead to a denial of service and remote access.

These vulnerabilities were reported by Internet Software Consortium (ISC):
http://www.isc.org/products/BIND/bind-security-19991108.html

These vulnerabilities were also reported by CERT(sm) in Advisory CA-99-14:
http://www.cert.org/advisories/CA-99-14-bind.html

These vulnerabilities have been publicly discussed in public Usenet
newsgroups and Internet mailing lists.


- - --------------------------
- - --- Temporary Solution ---
- - --------------------------

Unfortunately, there are no immediate or temporary workarounds for
this issue.  This issue can only be addressed with the installation
of a updated version of the BIND 8.2.2-P5 distribution.


- - ----------------
- - --- Solution ---
- - ----------------

No SGI patches are currently available for the various SGI BIND distributions.

Unsupported by SGI, BIND 8.2.2-P5 fixes for these vulnerabilities can
be found on:
http://www.isc.org/products/BIND/bind-security-19991108.html


- - -----------------------
- - --- Acknowledgments ---
- - -----------------------

SGI wishes to thank the Internet Software Consortium and the CERT
Coordination Center for their assistance in this matter.


- - -----------------------------------------
- - --- SGI Security Information/Contacts ---
- - -----------------------------------------

If there are questions about this document, email can be sent to
cse-security-alert@sgi.com.

                      ------oOo------

SGI provides security information and patches for use by the entire SGI
community.  This information is freely available to any person needing
the information and is available via anonymous FTP and the Web.

The primary SGI anonymous FTP site for security information and patches
is sgigate.sgi.com (204.94.209.1).  Security information and patches
are located under the directories ~ftp/security and ~ftp/patches,
respectively. The SGI Security Headquarters Web page is accessible at
the URL http://www.sgi.com/Support/security/security.html.

For issues with the patches on the FTP sites, email can be sent to
cse-security-alert@sgi.com.

For assistance obtaining or working with security patches, please
contact your SGI support provider.

                      ------oOo------

SGI provides a free security mailing list service called wiretap and
encourages interested parties to self-subscribe to receive (via email) all
SGI Security Advisories when they are released. Subscribing to the mailing
list can be done via the Web (http://www.sgi.com/Support/security/wiretap.html)
or by sending email to SGI as outlined below.

% mail wiretap-request@sgi.com
subscribe wiretap <YourEmailAddress>
end
^d

In the example above, <YourEmailAddress> is the email address that you
wish the mailing list information sent to.  The word end must be on a
separate line to indicate the end of the body of the message. The
control-d (^d) is used to indicate to the mail program that you are
finished composing the mail message.


                      ------oOo------

SGI provides a comprehensive customer World Wide Web site. This site is
located at http://www.sgi.com/Support/security/security.html.

                      ------oOo------

For reporting *NEW* SGI security issues, email can be sent to
security-alert@sgi.com or contact your SGI support provider.  A
support contract is not required for submitting a security report.

______________________________________________________________________________
      This information is provided freely to all interested parties
      and may be redistributed provided that it is not altered in any
      way, SGI is appropriately credited and the document retains and
      includes its valid PGP signature.


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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 use any or all of this information is
the responsibility of each user or organisation, and should be done so in
accordance with site policies and procedures.

NOTE: This is only the original release of the security bulletin.  It may
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Contact information for the authors of the original document is included
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Previous advisories and external security bulletins can be retrieved from:

	http://www.auscert.org.au/Information/advisories.html

If you believe that your system has been compromised, contact AusCERT or
your representative in FIRST (Forum of Incident Response and Security
Teams).

Internet Email: auscert@auscert.org.au
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