AUSCERT External Security Bulletin Redistribution

              ESB-97.152 -- SGI Security Advisory 19971101-01-PX
                           libXt Security Issues
                              19 November 1997


Silicon Graphics Inc. has released the following advisory concerning a
vulnerability in the Xt library.  Information regarding this vulnerability
has been previously described in CERT Advisory CA-97.11 (re-released as
AUSCERT ESB-97.054 on May 2, 1997).

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

Previous advisories and external security bulletins can be retrieved from:


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                Silicon Graphics Inc. Security Advisory

        Title:   libXt Security Issues
        Title:   CERT CA-97.11
        Number:  19971101-01-PX
        Date:    November 18, 1997

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
Silicon Graphics 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 ---
- - -----------------------

In disussions on public newsgroups and mailing lists, buffer overruns
in the Xt library of the X Windowing System and X application programs
have been discussed.

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

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

All Silicon Graphics computer systems running IRIX 4.x, IRIX 5.x
and IRIX 6.x utilize the X Windowing system and have X applications
by default.

A local account is required in order to exploit these vulnerabilities
both locally and remotely.

This issue has been publically disclosed and discussed in several
public forums newsgroups and mailing lists in addition to
security advisories CERT CA-97.11.

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

Unfortunately, there are no immediate or temporary workarounds for
this issue.  The issue can only be addressed with a patch.

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

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

   IRIX 3.x          no
   IRIX 4.x          yes          not avail    Note 1
   IRIX 5.0.x        yes          not avail    Note 1
   IRIX 5.1.x        yes          not avail    Note 1
   IRIX 5.2          yes          not avail    Note 1
   IRIX 5.3          yes          2155
   IRIX 6.0.x        yes          not avail    Note 1
   IRIX 6.1          yes          not avail    Note 1
   IRIX 6.2          yes          2154
   IRIX 6.3          yes          2153
   IRIX 6.4          yes          2396


     1) upgrade to supported operating system version

Patches are available via anonymous FTP and your service/support provider.

The SGI anonymous FTP site is sgigate.sgi.com ( or its
mirror, ftp.sgi.com.   Security information and patches can be found
in the ~ftp/security and ~ftp/patches directories, respectfully.

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

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

Filename:                 README.patch.2153
Algorithm #1 (sum -r):    25316 10 README.patch.2153
Algorithm #2 (sum):       65501 10 README.patch.2153
MD5 checksum:             61E23CC48D1295A14FF1BD14F1AE63E9

Filename:                 patchSG0002153
Algorithm #1 (sum -r):    63016 6 patchSG0002153
Algorithm #2 (sum):       54172 6 patchSG0002153
MD5 checksum:             283699BC58ABFF6F7C8BA3713D0AEEC4

Filename:                 patchSG0002153.idb
Algorithm #1 (sum -r):    28889 8 patchSG0002153.idb
Algorithm #2 (sum):       46999 8 patchSG0002153.idb
MD5 checksum:             B556DB55B2B5CF749C54E1AB5A4864A0

Filename:                 patchSG0002153.x_dev_sw
Algorithm #1 (sum -r):    03700 1039 patchSG0002153.x_dev_sw
Algorithm #2 (sum):       2287 1039 patchSG0002153.x_dev_sw
MD5 checksum:             2D95358E6433CDBE96D52F62D08A4CD3

Filename:                 patchSG0002153.x_dev_sw32
Algorithm #1 (sum -r):    64841 1251 patchSG0002153.x_dev_sw32
Algorithm #2 (sum):       38376 1251 patchSG0002153.x_dev_sw32
MD5 checksum:             EE7BE878CB7486BBA689DE31C49F2C2D

Filename:                 patchSG0002153.x_dev_sw64
Algorithm #1 (sum -r):    43845 1344 patchSG0002153.x_dev_sw64
Algorithm #2 (sum):       31671 1344 patchSG0002153.x_dev_sw64
MD5 checksum:             02803C4F21D9440D6B365B5E051260C6

Filename:                 patchSG0002153.x_eoe_sw
Algorithm #1 (sum -r):    43004 3102 patchSG0002153.x_eoe_sw
Algorithm #2 (sum):       56526 3102 patchSG0002153.x_eoe_sw
MD5 checksum:             4E50E4D94BFEA5652D20CE08BD120D0D

Filename:                 patchSG0002153.x_eoe_sw32
Algorithm #1 (sum -r):    38854 3358 patchSG0002153.x_eoe_sw32
Algorithm #2 (sum):       910 3358 patchSG0002153.x_eoe_sw32
MD5 checksum:             B5701DA482684D031D40249D6096971B

Filename:                 patchSG0002153.x_eoe_sw64
Algorithm #1 (sum -r):    24290 3562 patchSG0002153.x_eoe_sw64
Algorithm #2 (sum):       43506 3562 patchSG0002153.x_eoe_sw64
MD5 checksum:             73709C1BAF1B6A08DB6966DEB435B668

Filename:                 README.patch.2154
Algorithm #1 (sum -r):    02162 15 README.patch.2154
Algorithm #2 (sum):       39280 15 README.patch.2154
MD5 checksum:             5EEF5483CBDC8D804A29A0473230D277

Filename:                 patchSG0002154
Algorithm #1 (sum -r):    40324 14 patchSG0002154
Algorithm #2 (sum):       59115 14 patchSG0002154
MD5 checksum:             273ABFD8DAFDFC05BAA4727A39FB93D7

Filename:                 patchSG0002154.idb
Algorithm #1 (sum -r):    64074 7 patchSG0002154.idb
Algorithm #2 (sum):       61404 7 patchSG0002154.idb
MD5 checksum:             AF140498F7B12405046D2647E3DAFD73

Filename:                 patchSG0002154.x_dev_sw
Algorithm #1 (sum -r):    64669 1038 patchSG0002154.x_dev_sw
Algorithm #2 (sum):       43733 1038 patchSG0002154.x_dev_sw
MD5 checksum:             59113DE469DDD394ED11B9EC9E0BAD3A

Filename:                 patchSG0002154.x_dev_sw32
Algorithm #1 (sum -r):    09060 1252 patchSG0002154.x_dev_sw32
Algorithm #2 (sum):       50637 1252 patchSG0002154.x_dev_sw32
MD5 checksum:             801FBBD3B849DCCCCE32581006248194

Filename:                 patchSG0002154.x_dev_sw64
Algorithm #1 (sum -r):    45827 1344 patchSG0002154.x_dev_sw64
Algorithm #2 (sum):       7788 1344 patchSG0002154.x_dev_sw64
MD5 checksum:             4CE9812E5FBEAAA3BEE07EA1C8430C5A

Filename:                 patchSG0002154.x_eoe_sw
Algorithm #1 (sum -r):    14887 3034 patchSG0002154.x_eoe_sw
Algorithm #2 (sum):       11241 3034 patchSG0002154.x_eoe_sw
MD5 checksum:             BC5AA5A65C7560CD4734A68E73F3F853

Filename:                 patchSG0002154.x_eoe_sw32
Algorithm #1 (sum -r):    57921 2726 patchSG0002154.x_eoe_sw32
Algorithm #2 (sum):       41588 2726 patchSG0002154.x_eoe_sw32
MD5 checksum:             54C206869F69397875FD93216D991930

Filename:                 patchSG0002154.x_eoe_sw64
Algorithm #1 (sum -r):    53814 2868 patchSG0002154.x_eoe_sw64
Algorithm #2 (sum):       839 2868 patchSG0002154.x_eoe_sw64
MD5 checksum:             DB3862DE7C2E986E13E3E14C5E161E5E

Filename:                 README.patch.2155
Algorithm #1 (sum -r):    21907 13 README.patch.2155
Algorithm #2 (sum):       27373 13 README.patch.2155
MD5 checksum:             E6DABFBEE2945099D42F6063A11B6A7E

Filename:                 patchSG0002155
Algorithm #1 (sum -r):    02117 3 patchSG0002155
Algorithm #2 (sum):       5954 3 patchSG0002155
MD5 checksum:             35A01C9F197B55E05846A49F86001F33

Filename:                 patchSG0002155.idb
Algorithm #1 (sum -r):    36349 2 patchSG0002155.idb
Algorithm #2 (sum):       1931 2 patchSG0002155.idb
MD5 checksum:             7CE668036AABD4B63E65AF2E18A85079

Filename:                 patchSG0002155.x_dev_sw
Algorithm #1 (sum -r):    40176 1005 patchSG0002155.x_dev_sw
Algorithm #2 (sum):       14410 1005 patchSG0002155.x_dev_sw
MD5 checksum:             FB9E15AB9A24418A771D1A4239AACA9D

Filename:                 patchSG0002155.x_eoe_sw
Algorithm #1 (sum -r):    42558 2534 patchSG0002155.x_eoe_sw
Algorithm #2 (sum):       60261 2534 patchSG0002155.x_eoe_sw
MD5 checksum:             249A8BA0FD006A6543ED58548A961086

Filename:                 README.patch.2396
Algorithm #1 (sum -r):    21490 10 README.patch.2396
Algorithm #2 (sum):       59973 10 README.patch.2396
MD5 checksum:             51FBF3D675E4E43F2DF105FD60173D7E

Filename:                 patchSG0002396
Algorithm #1 (sum -r):    31021 6 patchSG0002396
Algorithm #2 (sum):       59122 6 patchSG0002396
MD5 checksum:             1CB84057C049D0AEEF1769147484D51D

Filename:                 patchSG0002396.eoe_sw
Algorithm #1 (sum -r):    44998 7 patchSG0002396.eoe_sw
Algorithm #2 (sum):       42468 7 patchSG0002396.eoe_sw
MD5 checksum:             948C51F29D9B18C71211551F2A9E2786

Filename:                 patchSG0002396.idb
Algorithm #1 (sum -r):    44652 6 patchSG0002396.idb
Algorithm #2 (sum):       50192 6 patchSG0002396.idb
MD5 checksum:             88153D362FE99D3C38B148649926B5E9

Filename:                 patchSG0002396.x_dev_sw
Algorithm #1 (sum -r):    21683 2337 patchSG0002396.x_dev_sw
Algorithm #2 (sum):       1525 2337 patchSG0002396.x_dev_sw
MD5 checksum:             D7A1332304D0053EE790F64C0C0D6B27

Filename:                 patchSG0002396.x_dev_sw64
Algorithm #1 (sum -r):    49044 1361 patchSG0002396.x_dev_sw64
Algorithm #2 (sum):       14474 1361 patchSG0002396.x_dev_sw64
MD5 checksum:             38F89FD774611E2D8DC65358C3CF809F

Filename:                 patchSG0002396.x_eoe_sw
Algorithm #1 (sum -r):    26996 5177 patchSG0002396.x_eoe_sw
Algorithm #2 (sum):       42378 5177 patchSG0002396.x_eoe_sw
MD5 checksum:             909745597814CC56DD5466CA4BEC3411

Filename:                 patchSG0002396.x_eoe_sw64
Algorithm #1 (sum -r):    25487 2832 patchSG0002396.x_eoe_sw64
Algorithm #2 (sum):       20908 2832 patchSG0002396.x_eoe_sw64
MD5 checksum:             E683B61D66B99B1A055AB8ACFFE28C32

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

Silicon Graphics wishes to thank the CERT Coordination Center
for their assistance in this matter.

- - -----------------------------------------------------------
- - --- Silicon Graphics Inc. Security Information/Contacts ---
- - -----------------------------------------------------------

If there are questions about this document, email can be sent to


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 (  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

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


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>

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.


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


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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