IRIX Xlib vulnerability

From: SGI Security Coordinator (agent99@sgi.com)
Date: 05/01/02


Date: Wed, 1 May 2002 14:59:25 -0700 (PDT)
From: SGI Security Coordinator <agent99@sgi.com>
To: agent99@sgi.com


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_____________________________________________________________________________

                          SGI Security Advisory

        Title: Xlib vulnerability
        Number: 20020502-01-I
        Date: May 1, 2002
        Reference: CAN-2000-0976
_____________________________________________________________________________

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

It's been reported on BugTraq that programs that are setuid and linked
against Xlib can be made to overflow buffers in /usr/lib/libX11.so.

See http://www.securityfocus.com/archive/1/139436 and
http://www.xfree86.org/security/ for additional details.

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.

These issues have been corrected in IRIX 6.5.12 and later versions.

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

The X11 library is part of the IRIX X11 Execution Environment, and is
installed by default on all graphics-capable SGI machines.

To see if libX11.so is installed, execute the following command:

  $ versions x_eoe.sw.eoe
  I = Installed, R = Removed

   Name Date Description

   I x_eoe 09/19/2000 X11 Execution Environment,
                                       ${IRIX_RELEASE_NUMBER}, based on X11R6.3
   I x_eoe.sw 09/19/2000 X11 Execution Environment
   I x_eoe.sw.eoe 09/19/2000 X11 Execution Environment

If the output looks similar to the above, then the X11 Execution Environment
is installed, and you are vulnerable if the version shown is earlier than
6.5.12.

This vulnerability may be not exploited by a remote user, a local account is
required.

This vulnerability has been fixed in IRIX 6.5.12 and later versions.

This vulnerability was assigned the following CVE:
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2000-0976

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

There is no effective workaround for this vulnerability.

SGI recommends upgrading to IRIX 6.5.12 or a later version.

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

SGI has not provided patches for this vulnerability. Our recommendation is
to upgrade to IRIX 6.5.12 or a later version.

   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 6.5.11 yes Notes 2 & 3
   IRIX 6.5.12 no
   IRIX 6.5.13 no
   IRIX 6.5.14 no
   IRIX 6.5.15 no
   IRIX 6.5.16 no

   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 6.5.12 or a later version of IRIX.

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

SGI wishes to thank Michal Zalewski, Security Focus 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------

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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------

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                      ------oOo------

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located at http://www.sgi.com/support/security/ .

                      ------oOo------

If there are general security questions on SGI systems, email can be sent to
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______________________________________________________________________________
      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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