-----BEGIN PGP SIGNED MESSAGE-----

===========================================================================
             AUSCERT External Security Bulletin Redistribution

                   ESB-2001.358 -- SGI Security Advisory
                IRIX Telnet protocol options vulnerability
                              23 August 2001

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

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

Product:                telnet daemon
Vendor:                 SGI
Operating System:       IRIX 6.5.x
Impact:                 Root Compromise
Access Required:        Remote

- --------------------------BEGIN INCLUDED TEXT--------------------

- -----BEGIN PGP SIGNED MESSAGE-----

______________________________________________________________________________
                          SGI Security Advisory

        Title:   IRIX Telnet protocol options vulnerability
        Number:  20010801-01-P
        Date:    August 22, 2001

______________________________________________________________________________

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.
______________________________________________________________________________

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

The TESO crew (http://www.team-teso.net/) has reported via BUGTRAQ that
a buffer overflows have been discovered in telnet options which can
lead to a root compromise.

SGI has investigated the issue and recommends the following steps for
neutralizing the exposure.  It is HIGHLY RECOMMENDED that these measures
be implemented on ALL vulnerable SGI systems.  This issue will be
corrected in future releases of IRIX.


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

The telnet daemon is installed by default on IRIX.

A local user account on the vulnerable system is not required in order
to exploit telnet daemon.  The telnet daemon can be exploited remotely
over an untrusted network.

The exploitable buffer overflow vulnerability could lead to a root
compromise.

This telnet vulnerability was reported by TESO crew on BUGTRAQ:
http://www.securityfocus.com/archive/1/197804
http://www.securityfocus.com/bid/3064

This telnet options vulnerability has been publicly discussed in
Usenet newsgroups and mailing lists.


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

Although patches are available for this issue, it is realized that
there may be situations where installing the patches immediately may
not be possible.

The steps below can be used to disable the telnetd daemon to prevent
exploitation of this vulnerability until patches can be installed.

      ================
      ****  NOTE  ****
      ================

      Disabling telnetd daemon will disable the telnet service.

     1) Become the root user on the system.

              % /bin/su -
              Password:
              #


     2) Edit the file /etc/inetd.conf (for IRIX 5.3 and lower,
        edit /usr/etc/inetd.conf) with your favorite text editor.
        Place a "#" as the first character of the line to comment out
        and deactivate the telnetd daemon.

              # vi /etc/inetd.conf

        {Find the following line}

              telnet stream  tcp  nowait  root  /usr/etc/telnetd  telnetd

        {Place a "#" as the first character of the telnet line}

              #telnet stream  tcp  nowait  root  /usr/etc/telnetd  telnetd

        {Save the file}


     3) Force inetd to re-read the configuration file.

              # /etc/killall -HUP inetd


     4) Kill any existing telnetd process.

              # /etc/killall telnetd


     5) Return to previous level.

              # exit
              %


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

   OS Version     Vulnerable?     Patch #      Other Actions
   ----------     -----------     -------      -------------

   IRIX 3.x        unknown                     Note 1
   IRIX 4.x        unknown                     Note 1
   IRIX 5.x        unknown                     Note 1
   IRIX 6.0.x      unknown                     Note 1
   IRIX 6.1        unknown                     Note 1
   IRIX 6.2        unknown                     Note 1
   IRIX 6.3        unknown                     Note 1
   IRIX 6.4        unknown                     Note 1
   IRIX 6.5          yes           4354        Note 2 & 3
   IRIX 6.5.1        yes           4354        Note 2 & 3
   IRIX 6.5.2        yes           4354        Note 2 & 3
   IRIX 6.5.3        yes           4354        Note 2 & 3
   IRIX 6.5.4        yes           4354        Note 2 & 3
   IRIX 6.5.5        yes           4354        Note 2 & 3
   IRIX 6.5.6        yes           4354        Note 2 & 3
   IRIX 6.5.7        yes           4354        Note 2 & 3
   IRIX 6.5.8        yes           4354        Note 2 & 3
   IRIX 6.5.9        yes           4354        Note 2 & 3
   IRIX 6.5.10       yes           4354        Note 2 & 3
   IRIX 6.5.11       yes           4354        Note 2 & 3
   IRIX 6.5.12       yes           4354        Note 2 & 3
   IRIX 6.5.13       yes           4354        Note 3 & 4


   NOTES

     1) This version of the IRIX operating has been retired.
        Upgrade to an actively supported IRIX operating system.
        See http://support.sgi.com/irix/news/index.html#policy
        for more information.

     2) This version of the IRIX operating system is in maintenance mode.
        Upgrade to an actively supported IRIX operating system.
        See http://support.sgi.com/irix/news/index.html#policy
        for more information.

     3) See "Temporary Solution" section.

     4) IRIX 6.5.13m can be obtained from the web at:
        http://support.sgi.com/colls/patches/tools/relstream/index.html
        or from your local SGI support provider.


Patches are available via the web, anonymous FTP and from your SGI
service/support provider.

SGI Security Advisories can be found at:
http://www.sgi.com/support/security/ and
ftp://patches.sgi.com/support/free/security/advisories/

SGI Security Patches can be found at:
http://www.sgi.com/support/security/ and
ftp://patches.sgi.com/support/free/security/patches/

SGI patches for IRIX can be found at the following patch servers:
http://support.sgi.com/irix/ and ftp://patches.sgi.com/

SGI freeware updates for IRIX can be found at:
http://freeware.sgi.com/

SGI fixes for SGI open sourced code can be found on:
http://oss.sgi.com/projects/

SGI patches and RPMs for Linux can be found at:
http://support.sgi.com/linux/ or
http://oss.sgi.com/projects/sgilinux-combined/download/security-fixes/

SGI patches for Windows NT or 2000 can be found at:
http://support.sgi.com/nt/

IRIX 5.2-6.4 Recommended/Required Patch Sets can be found at:
http://support.sgi.com/irix/ and ftp://patches.sgi.com/support/patchset/

IRIX 6.5 Maintenance Release Streams can be found at:
http://support.sgi.com/colls/patches/tools/relstream/index.html

The primary SGI anonymous FTP site for security advisories and patches
is patches.sgi.com (216.32.174.211).  Security advisories and patches
are located under the URL ftp://patches.sgi.com/support/free/security/

For security and patch management reasons, ftp.sgi.com (mirrors
patches.sgi.com security FTP repository) lags behind and does not
do a real-time update.



                 ##### Patch File Checksums ####

The actual patch will be a tar file containing the following files:

Filename:                 README.patch.4354
Algorithm #1 (sum -r):    15107 8 README.patch.4354
Algorithm #2 (sum):       41401 8 README.patch.4354
MD5 checksum:             3CA0032F2299AD2A98D442C600786BB5

Filename:                 patchSG0004354
Algorithm #1 (sum -r):    06094 4 patchSG0004354
Algorithm #2 (sum):       9048 4 patchSG0004354
MD5 checksum:             8ADD66265D2EE6C687A0DF2304E13033

Filename:                 patchSG0004354.eoe_sw
Algorithm #1 (sum -r):    59132 59 patchSG0004354.eoe_sw
Algorithm #2 (sum):       64895 59 patchSG0004354.eoe_sw
MD5 checksum:             7A8688D3C7D562EB33AAF3DE4159BF92

Filename:                 patchSG0004354.idb
Algorithm #1 (sum -r):    05247 1 patchSG0004354.idb
Algorithm #2 (sum):       34625 1 patchSG0004354.idb
MD5 checksum:             D5A2AD9BA16DEC191853B1A562DDA953


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

SGI wishes to thank the users of the Internet Community at large for their
assistance in this matter.


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

If there are questions about this document, email can be sent to
security-info@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 advisories and patches
is patches.sgi.com (216.32.174.211).  Security advisories and patches
are located under the URL ftp://patches.sgi.com/support/free/security/

The SGI Security Headquarters Web page is accessible at the URL:
http://www.sgi.com/support/security/

For issues with the patches on the FTP sites, email can be sent to
security-info@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/ .

                      ------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.

- -----BEGIN PGP SIGNATURE-----
Version: 2.6.2

iQCVAwUBO4Q/fLQ4cFApAP75AQHhzQP/Ud9Cp+rX/MM7brhw+PgOvtn7cAuamix5
wu1cc2pivlXYfB0JPdLl4ZCvxXltn0PPi7rjcz4CgU3k5j8I4tumNuEW5nqBukNy
E3HsFXT1M1tLwEDqSsotLtT+CR6VXtiEvOm0SeM8GB86OAgcuiW4ZpcK6WPJhdgi
u/7wHAr2/Yc=
=zK3h
- -----END PGP SIGNATURE-----

- --------------------------END INCLUDED TEXT--------------------

You have received this e-mail bulletin as a result of your organisation's
registration with AusCERT. The mailing list you are subscribed to is
maintained within your organisation, so if you do not wish to continue
receiving these bulletins you should contact your local IT manager. If
you do not know who that is, please send an email to auscert@auscert.org.au
and we will forward your request to the appropriate person.

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
not be updated when updates to the original are made.  If downloading at
a later date, it is recommended that the bulletin is retrieved directly
from the original authors to ensure that the information is still current.

Contact information for the authors of the original document is included
in the Security Bulletin above.  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.

-----BEGIN PGP SIGNATURE-----
Version: 2.6.3i
Charset: noconv
Comment: ftp://ftp.auscert.org.au/pub/auscert/AUSCERT_PGP.key

iQCVAwUBO4UpsSh9+71yA2DNAQFdQQP8CPnPlyLCzcuRJd5paPGcRnn47sNbnkE0
dULhQwy9/ZAu0WmPI/MKqZGaAi3fWadEiuaMQt/zRlwhyuGhMf/mtItdjVJBi6zN
7A99TXZSCL32CJ2EUufzY2KGodevnPy4ofnS+dij5R86OPdraWuCeYNoMwtu2dwP
FgpNqWI/OAo=
=WIYo
-----END PGP SIGNATURE-----