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IRIX rpc/HOSTALIASES vulnerability
From: SGI Security Coordinator <agent99 () sgi com>
Date: Thu, 28 Mar 2002 10:46:54 -0800 (PST)

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

______________________________________________________________________________

                          SGI Security Advisory

        Title:      IRIX rpc/HOSTALIASES vulnerability
        Number:     20020306-01-P
        Date:       March 28, 2002
        Reference:  CVE CAN-2002-0039 RPC
        Reference:  CVE CAN-2002-0040 HOSTALIASES
______________________________________________________________________________

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

It's been reported that certain malformed RPC requests with invalid lengths
can cause portmap and rpcbind to report a Bus error and exit. Under some
circumstances this can lead to a remote denial of service attack.

SGI has also discovered a problem where, when the HOSTALIASES environment
variable is set in a particular way, privileged applications that do name
resolution can dump core.

SGI has investigated the issues and recommends the following steps for
neutralizing the exposure.  It is HIGHLY RECOMMENDED that these measures be
implemented on ALL vulnerable SGI systems.

These issues have been corrected in future releases of IRIX.


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

The portmap binary is installed by default on IRIX 6.5 systems as part of
eoe.sw.base.  The rpcbind binary is installed as part of the optional
eoe.sw.svr4net subsystem.

To see if rpcbind is installed, execute the following command:

   $ versions long | grep rpcbind

If the above command returns a line similar to the following, then rpcbind
is installed.

   f 14263   113 eoe.sw.svr4net          usr/etc/rpcbind

These vulnerabilities may be exploited by a remote user, and no local
account is required.

Other RPC servers might be impacted.

This RPC vulnerability can lead to a denial of service attack.

For the RPC vulnerability, SGI assigned CVE CAN-2002-0039:
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2002-0039

The ability to set the HOSTALIASES environment variable is available on all
versions of IRIX.  This vulnerability was introduced in IRIX 6.5.11.

For the HOSTALIASES vulnerability, SGI assigned CVE CAN-2002-0040:
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2002-0040

These vulnerabilities will be fixed in IRIX 6.5.16m and IRIX 6.5.16f.


- ----------------------------
- --- Temporary Workaround ---
- ----------------------------

There is no good workaround available for these problems.  SGI recommends
either upgrading to IRIX 6.5.16 when it is released, or installing the
appropriate patch from the listing below.


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

SGI has provided a series of patches for these vulnerabilities. Our
recommendation is to upgrade to IRIX 6.5.16 when available, or install the
appropriate patch.

   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                       Notes 2 & 3
   IRIX 6.5.1        yes                       Notes 2 & 3
   IRIX 6.5.2        yes                       Notes 2 & 3
   IRIX 6.5.3        yes                       Notes 2 & 3
   IRIX 6.5.4        yes                       Notes 2 & 3
   IRIX 6.5.5        yes                       Notes 2 & 3
   IRIX 6.5.6        yes                       Notes 2 & 3
   IRIX 6.5.7        yes                       Notes 2 & 3
   IRIX 6.5.8        yes                       Notes 2 & 3
   IRIX 6.5.9        yes                       Notes 2 & 3
   IRIX 6.5.10       yes                       Notes 2 & 3
   IRIX 6.5.11m      yes          4508
   IRIX 6.5.11f      yes          4509
   IRIX 6.5.12m      yes          4506
   IRIX 6.5.12f      yes          4507
   IRIX 6.5.13m      yes          4504
   IRIX 6.5.13f      yes          4505
   IRIX 6.5.14m      yes          4502
   IRIX 6.5.14f      yes          4503
   IRIX 6.5.15m      yes          4500
   IRIX 6.5.15f      yes          4501

   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) If you have not received an IRIX 6.5.X CD for IRIX 6.5, contact your
        SGI Support Provider or URL: http://support.sgi.com/irix/swupdates/

     3) Upgrade to IRIX 6.5.16m or 6.5.16f.

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

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

Filename:                 README.patch.4500
Algorithm #1 (sum -r):    24079 8 README.patch.4500
Algorithm #2 (sum):       27326 8 README.patch.4500
MD5 checksum:             A683786B9C3B27966C5731EB6D91ED6D

Filename:                 patchSG0004500
Algorithm #1 (sum -r):    30795 3 patchSG0004500
Algorithm #2 (sum):       30429 3 patchSG0004500
MD5 checksum:             EBAABBFEDE71D506A3A90693E63553AA

Filename:                 patchSG0004500.dev_sw
Algorithm #1 (sum -r):    03174 2188 patchSG0004500.dev_sw
Algorithm #2 (sum):       45745 2188 patchSG0004500.dev_sw
MD5 checksum:             7C747C739A131E95AB48019EBF70EE99

Filename:                 patchSG0004500.eoe_sw
Algorithm #1 (sum -r):    34927 12545 patchSG0004500.eoe_sw
Algorithm #2 (sum):       15539 12545 patchSG0004500.eoe_sw
MD5 checksum:             5DFCAB26FE0FD46D7FEEEA95C9FA89A9

Filename:                 patchSG0004500.eoe_sw64
Algorithm #1 (sum -r):    49216 5357 patchSG0004500.eoe_sw64
Algorithm #2 (sum):       31728 5357 patchSG0004500.eoe_sw64
MD5 checksum:             83A5BD01834586DE2D47547C3E1CCE67

Filename:                 patchSG0004500.idb
Algorithm #1 (sum -r):    24179 5 patchSG0004500.idb
Algorithm #2 (sum):       41622 5 patchSG0004500.idb
MD5 checksum:             79208710902496D0C2AFD5DA2679C005


Filename:                 README.patch.4501
Algorithm #1 (sum -r):    45079 8 README.patch.4501
Algorithm #2 (sum):       27296 8 README.patch.4501
MD5 checksum:             A1EA9F724C92F153F725DDF207623D23

Filename:                 patchSG0004501
Algorithm #1 (sum -r):    47093 3 patchSG0004501
Algorithm #2 (sum):       33316 3 patchSG0004501
MD5 checksum:             8E1626682DA0D460928C43576878788A

Filename:                 patchSG0004501.dev_sw
Algorithm #1 (sum -r):    19202 2231 patchSG0004501.dev_sw
Algorithm #2 (sum):       63352 2231 patchSG0004501.dev_sw
MD5 checksum:             EEF04B8866F492EDC81A0BB7DA0069F4

Filename:                 patchSG0004501.eoe_sw
Algorithm #1 (sum -r):    22992 12815 patchSG0004501.eoe_sw
Algorithm #2 (sum):       46143 12815 patchSG0004501.eoe_sw
MD5 checksum:             6D4F8FC17A5761419E3092DC5AAF90E1

Filename:                 patchSG0004501.eoe_sw64
Algorithm #1 (sum -r):    43705 5430 patchSG0004501.eoe_sw64
Algorithm #2 (sum):       25933 5430 patchSG0004501.eoe_sw64
MD5 checksum:             B8393ECB1F56CC2C2560DB58BDC33924

Filename:                 patchSG0004501.idb
Algorithm #1 (sum -r):    15890 5 patchSG0004501.idb
Algorithm #2 (sum):       41638 5 patchSG0004501.idb
MD5 checksum:             179DFD2D032C7C09FAC04469603918BE


Filename:                 README.patch.4502
Algorithm #1 (sum -r):    61767 8 README.patch.4502
Algorithm #2 (sum):       43491 8 README.patch.4502
MD5 checksum:             96E66C646AB21364DBCC1B12C4C22775

Filename:                 patchSG0004502
Algorithm #1 (sum -r):    63206 4 patchSG0004502
Algorithm #2 (sum):       46494 4 patchSG0004502
MD5 checksum:             5CDB32A5E5E9D5A9AEFFDB7D32139888

Filename:                 patchSG0004502.dev_sw
Algorithm #1 (sum -r):    41925 2510 patchSG0004502.dev_sw
Algorithm #2 (sum):       35693 2510 patchSG0004502.dev_sw
MD5 checksum:             477A96DBC30614CC2C234E904DE000C8

Filename:                 patchSG0004502.eoe_sw
Algorithm #1 (sum -r):    58943 13293 patchSG0004502.eoe_sw
Algorithm #2 (sum):       16100 13293 patchSG0004502.eoe_sw
MD5 checksum:             6CDC90BA8664EC209F450C47D7BEFB83

Filename:                 patchSG0004502.eoe_sw64
Algorithm #1 (sum -r):    22306 5389 patchSG0004502.eoe_sw64
Algorithm #2 (sum):       34583 5389 patchSG0004502.eoe_sw64
MD5 checksum:             204A30A5DFB027E3F659E1B5F877F208

Filename:                 patchSG0004502.idb
Algorithm #1 (sum -r):    40474 6 patchSG0004502.idb
Algorithm #2 (sum):       5990 6 patchSG0004502.idb
MD5 checksum:             ED965E75369CA59EF1F4D96D44F171D4


Filename:                 README.patch.4503
Algorithm #1 (sum -r):    31520 8 README.patch.4503
Algorithm #2 (sum):       43480 8 README.patch.4503
MD5 checksum:             078EACF3A40477621DD14B83B744FB64

Filename:                 patchSG0004503
Algorithm #1 (sum -r):    41058 4 patchSG0004503
Algorithm #2 (sum):       48844 4 patchSG0004503
MD5 checksum:             6288DDDD3FB174CDED54B0882111C0AB

Filename:                 patchSG0004503.dev_sw
Algorithm #1 (sum -r):    59401 2557 patchSG0004503.dev_sw
Algorithm #2 (sum):       58909 2557 patchSG0004503.dev_sw
MD5 checksum:             0B4A034E3855F126607925138A88D634

Filename:                 patchSG0004503.eoe_sw
Algorithm #1 (sum -r):    50172 13552 patchSG0004503.eoe_sw
Algorithm #2 (sum):       7914 13552 patchSG0004503.eoe_sw
MD5 checksum:             E2CAC9B39C6B623DDE4E3B4BA9007305

Filename:                 patchSG0004503.eoe_sw64
Algorithm #1 (sum -r):    57468 5460 patchSG0004503.eoe_sw64
Algorithm #2 (sum):       14673 5460 patchSG0004503.eoe_sw64
MD5 checksum:             DA33A1EEEB7F9843960E83CA82808719

Filename:                 patchSG0004503.idb
Algorithm #1 (sum -r):    11027 6 patchSG0004503.idb
Algorithm #2 (sum):       5930 6 patchSG0004503.idb
MD5 checksum:             90A62A9495602B37DB8D861F231E1F99


Filename:                 README.patch.4504
Algorithm #1 (sum -r):    36178 8 README.patch.4504
Algorithm #2 (sum):       33791 8 README.patch.4504
MD5 checksum:             8303F1AD3ED3976E59056F555551FE60

Filename:                 patchSG0004504
Algorithm #1 (sum -r):    61420 3 patchSG0004504
Algorithm #2 (sum):       31450 3 patchSG0004504
MD5 checksum:             362BCE1D6C14BF09D7E3E9CA9CD46570

Filename:                 patchSG0004504.dev_sw
Algorithm #1 (sum -r):    02610 2504 patchSG0004504.dev_sw
Algorithm #2 (sum):       19583 2504 patchSG0004504.dev_sw
MD5 checksum:             94DAF79913BC9096491F22B2C134E3F1

Filename:                 patchSG0004504.eoe_sw
Algorithm #1 (sum -r):    25778 13234 patchSG0004504.eoe_sw
Algorithm #2 (sum):       50294 13234 patchSG0004504.eoe_sw
MD5 checksum:             EE501FA54D3C45277854610A7190248A

Filename:                 patchSG0004504.eoe_sw64
Algorithm #1 (sum -r):    58822 5362 patchSG0004504.eoe_sw64
Algorithm #2 (sum):       13520 5362 patchSG0004504.eoe_sw64
MD5 checksum:             AED8EA3CA764F0A99FE2B8E29BCCB115

Filename:                 patchSG0004504.idb
Algorithm #1 (sum -r):    47532 6 patchSG0004504.idb
Algorithm #2 (sum):       15537 6 patchSG0004504.idb
MD5 checksum:             D31CA254B6E82F0C342BDE6CACF1FED6


Filename:                 README.patch.4505
Algorithm #1 (sum -r):    39733 8 README.patch.4505
Algorithm #2 (sum):       33812 8 README.patch.4505
MD5 checksum:             AD47384B82D169B49CE12303A41A360C

Filename:                 patchSG0004505
Algorithm #1 (sum -r):    31469 5 patchSG0004505
Algorithm #2 (sum):       16698 5 patchSG0004505
MD5 checksum:             15FEC3792008A05787DC3B98554A41CB

Filename:                 patchSG0004505.dev_sw
Algorithm #1 (sum -r):    64128 2547 patchSG0004505.dev_sw
Algorithm #2 (sum):       10024 2547 patchSG0004505.dev_sw
MD5 checksum:             943A4F5B51A2F07E8AD770A7479CF4B8

Filename:                 patchSG0004505.eoe_sw
Algorithm #1 (sum -r):    43494 13491 patchSG0004505.eoe_sw
Algorithm #2 (sum):       8431 13491 patchSG0004505.eoe_sw
MD5 checksum:             D329BCECF1690BF210A3554139725D90

Filename:                 patchSG0004505.eoe_sw64
Algorithm #1 (sum -r):    50845 5436 patchSG0004505.eoe_sw64
Algorithm #2 (sum):       17771 5436 patchSG0004505.eoe_sw64
MD5 checksum:             70AF995506C97CF26C12990CCCE2B6D2

Filename:                 patchSG0004505.idb
Algorithm #1 (sum -r):    13816 6 patchSG0004505.idb
Algorithm #2 (sum):       15327 6 patchSG0004505.idb
MD5 checksum:             014FE84C8C4A2CFD04DE66BC97F09511


Filename:                 README.patch.4506
Algorithm #1 (sum -r):    50579 8 README.patch.4506
Algorithm #2 (sum):       33826 8 README.patch.4506
MD5 checksum:             B8166901D33D76F814BC94D18154B5A0

Filename:                 patchSG0004506
Algorithm #1 (sum -r):    64670 3 patchSG0004506
Algorithm #2 (sum):       30670 3 patchSG0004506
MD5 checksum:             FE025CB008F18E42EC367CB16B69C051

Filename:                 patchSG0004506.dev_sw
Algorithm #1 (sum -r):    27952 2509 patchSG0004506.dev_sw
Algorithm #2 (sum):       29860 2509 patchSG0004506.dev_sw
MD5 checksum:             B190605FED31A3CA54C7CEF6C26FB9D9

Filename:                 patchSG0004506.eoe_sw
Algorithm #1 (sum -r):    43323 13227 patchSG0004506.eoe_sw
Algorithm #2 (sum):       57798 13227 patchSG0004506.eoe_sw
MD5 checksum:             CA584A50AA9C35130654DE5D7328F795

Filename:                 patchSG0004506.eoe_sw64
Algorithm #1 (sum -r):    07348 5380 patchSG0004506.eoe_sw64
Algorithm #2 (sum):       4938 5380 patchSG0004506.eoe_sw64
MD5 checksum:             0D4F185B6B401E4CE372D55CC71A4D83

Filename:                 patchSG0004506.idb
Algorithm #1 (sum -r):    52549 6 patchSG0004506.idb
Algorithm #2 (sum):       15396 6 patchSG0004506.idb
MD5 checksum:             94A02FA34BC8E20BD4B78167057F2A10


Filename:                 README.patch.4507
Algorithm #1 (sum -r):    39614 8 README.patch.4507
Algorithm #2 (sum):       33811 8 README.patch.4507
MD5 checksum:             F8EB223D3A6A0F5E177892184EC722DD

Filename:                 patchSG0004507
Algorithm #1 (sum -r):    14189 3 patchSG0004507
Algorithm #2 (sum):       34606 3 patchSG0004507
MD5 checksum:             B5B163DFAE2E0A33C24682292C86E37E

Filename:                 patchSG0004507.dev_sw
Algorithm #1 (sum -r):    06124 2559 patchSG0004507.dev_sw
Algorithm #2 (sum):       53183 2559 patchSG0004507.dev_sw
MD5 checksum:             B44C0334269E351C65A70530AE6D506A

Filename:                 patchSG0004507.eoe_sw
Algorithm #1 (sum -r):    46017 13503 patchSG0004507.eoe_sw
Algorithm #2 (sum):       28729 13503 patchSG0004507.eoe_sw
MD5 checksum:             869FE8F896DF76B6D1E587177AA114FA

Filename:                 patchSG0004507.eoe_sw64
Algorithm #1 (sum -r):    50938 5444 patchSG0004507.eoe_sw64
Algorithm #2 (sum):       19744 5444 patchSG0004507.eoe_sw64
MD5 checksum:             9D812AB3F239D1FB61AE7F055C20388A

Filename:                 patchSG0004507.idb
Algorithm #1 (sum -r):    27055 6 patchSG0004507.idb
Algorithm #2 (sum):       15521 6 patchSG0004507.idb
MD5 checksum:             24DCC11912C6319757A84D0B6071CDBF
Filename:                 README.patch.4508
Algorithm #1 (sum -r):    00387 8 README.patch.4508
Algorithm #2 (sum):       33841 8 README.patch.4508
MD5 checksum:             B09F1D028A5267B80306F73B03292DB6

Filename:                 patchSG0004508
Algorithm #1 (sum -r):    40393 3 patchSG0004508
Algorithm #2 (sum):       33728 3 patchSG0004508
MD5 checksum:             AE4A4145B5BA3D35D49C34A088AF0BEB

Filename:                 patchSG0004508.dev_sw
Algorithm #1 (sum -r):    33417 2654 patchSG0004508.dev_sw
Algorithm #2 (sum):       47482 2654 patchSG0004508.dev_sw
MD5 checksum:             FCDDD28A3C08F666648B9E1C686DEEC8

Filename:                 patchSG0004508.eoe_sw
Algorithm #1 (sum -r):    14173 14692 patchSG0004508.eoe_sw
Algorithm #2 (sum):       9192 14692 patchSG0004508.eoe_sw
MD5 checksum:             CE798D2EAAC0FAC9627FA9432192E6A5

Filename:                 patchSG0004508.eoe_sw64
Algorithm #1 (sum -r):    31321 5994 patchSG0004508.eoe_sw64
Algorithm #2 (sum):       49296 5994 patchSG0004508.eoe_sw64
MD5 checksum:             EFEDFCFC1AD278C467EDF956737EA9AA

Filename:                 patchSG0004508.idb
Algorithm #1 (sum -r):    22577 6 patchSG0004508.idb
Algorithm #2 (sum):       15558 6 patchSG0004508.idb
MD5 checksum:             6003104A09DF694B13FF5631839C215F


Filename:                 README.patch.4509
Algorithm #1 (sum -r):    05430 8 README.patch.4509
Algorithm #2 (sum):       33822 8 README.patch.4509
MD5 checksum:             89B6CD8F31CE920DFA104CF8AEAC265A

Filename:                 patchSG0004509
Algorithm #1 (sum -r):    27722 3 patchSG0004509
Algorithm #2 (sum):       36836 3 patchSG0004509
MD5 checksum:             5E8ACCF0A373C52553F973CC3C15A124

Filename:                 patchSG0004509.dev_sw
Algorithm #1 (sum -r):    14401 2700 patchSG0004509.dev_sw
Algorithm #2 (sum):       11066 2700 patchSG0004509.dev_sw
MD5 checksum:             094C4E9E85A8A5D449D0B61EAC46A769

Filename:                 patchSG0004509.eoe_sw
Algorithm #1 (sum -r):    54260 14894 patchSG0004509.eoe_sw
Algorithm #2 (sum):       6168 14894 patchSG0004509.eoe_sw
MD5 checksum:             A6DF1F423E520F822B022826B6B540FB

Filename:                 patchSG0004509.eoe_sw64
Algorithm #1 (sum -r):    49494 6105 patchSG0004509.eoe_sw64
Algorithm #2 (sum):       10081 6105 patchSG0004509.eoe_sw64
MD5 checksum:             832D5409FF4A05DD85E8866822442066

Filename:                 patchSG0004509.idb
Algorithm #1 (sum -r):    05704 6 patchSG0004509.idb
Algorithm #2 (sum):       15503 6 patchSG0004509.idb
MD5 checksum:             9D2C107940C3862744B328F16A8E6338


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

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


- -------------
- --- Links ---
- -------------

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

IRIX 6.5 Software Update CDs can be obtained from:
http://support.sgi.com/irix/swupdates/

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.


- -----------------------------------------
- --- 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------

If there are general security questions on SGI systems, email can be sent to
security-info () sgi com 

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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