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            AUSCERT External Security Bulletin Redistribution
                                    
                                    
              ESB-98.106 -- SGI Security Advisory 19980605-01-A
                 IRIX mailx(1) Buffer Overrun Vulnerability
                                29 June 1998

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

Silicon Graphics Inc. has released the following advisory concerning
a buffer overrun vulnerability in the IRIX mailx(1) program.

The following security bulletin is provided as a service to AusCERT's
members.  As AusCERT did not write this document, AusCERT has had
no control over its content.  As such, 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 will not be updated when the original bulletin is.  If downloading
at a later date, it is recommended that the bulletin is retrieved
from the original authors to ensure that the information is still
current.

Contact information for SGI is included in the Security Bulletin
below.  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/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
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 emergencies.


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______________________________________________________________________________
                Silicon Graphics Inc. Security Advisory

        Title:   IRIX mailx(1) Buffer Overrun Vulnerability
        Number:  19980605-01-A
        Date:    June 26, 1998
______________________________________________________________________________

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

Silicon Graphics 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.
______________________________________________________________________________

- - -----------------------
- - --- Issue Statement ---
- - -----------------------

Silicon Graphics Inc. acknowledges the mailx(1) buffer overrun vulnerability
publically reported by several individuals and in the Internet newsgroups.

Currently, Silicon Graphics Inc. is investigating and no further information
is available for public release at this time.

For the protection of all our customers, SGI does not disclose, discuss
or confirm vulnerabilities until a full investigation has occurred and
any necessary patch(es) are available.

Until Silicon Graphics has more definitive information to provide, customers
are encouraged to assume all security vulnerabilities as exploitable and take
appropriate steps according to local site security policies and requirements.

As further information becomes available, additional advisories will be
issued via the normal SGI security information distribution methods
including the wiretap mailing list.



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

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

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

Silicon Graphics 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 Silicon Graphics 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------

Silicon Graphics 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------

Silicon Graphics 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, Silicon
  Graphics is appropriately credited and the document retains and
  includes its valid PGP signature.

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