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Category:   Application (Generic)  >   Xlib Vendors:   SGI (Silicon Graphics)
(SGI Issues Fix) XFree Xlib Buffer Overflow May Let Local Users Exploit Linked Programs to Gain Elevated Privileges
SecurityTracker Alert ID:  1004205
SecurityTracker URL:  http://securitytracker.com/id/1004205
CVE Reference:   CVE-2000-0976   (Links to External Site)
Date:  May 2 2002
Impact:   Execution of arbitrary code via local system, Root access via local system, User access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   A buffer overflow vulnerability has been reported in XFree's Xlib. A local user may be able to obtain elevated privileges on the system.

A vulnerability was reported in /usr/lib/libX11.so on SGI IRIX systems. The X11 library is part of the IRIX X11 Execution Environment and is reportedly installed by default on all graphics-capable SGI machines.

To see if libX11.so is installed, execute the following command and compare to the result provided in the Source Message:

$ versions x_eoe.sw.eoe

According to the report, programs that are configured with set user id (setuid) privileges and are linked against Xlib may be exploited. A local user can apparently invoke any executable linked against Xlib with the '-display' command-line parameter or DISPLAY environment variable set in a certain way to cause the stack to overflow.

A demonstration exploit is provided:

DISPLAY=:`perl -e '{print "0"x128}'` any_privledged_X_application
(or: any_privledged_X_application -display :...)

SGI credits Michal Zalewski and Security Focus with reporting this flaw.

[Editor's note: This vulnerability was originally reported October 2000 in XFree 3.3.x Xlib. SGI is just now issuing an advisory.]

Impact:   A local user may be able to trigger a buffer overflow to execute arbitrary code on the system, potentially with elevated privileges.
Solution:   SGI has not provided patches for this vulnerability but has corrected the issue in IRIX 6.5.12 and later versions.


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.

Vendor URL:  www.sgi.com/support/security/ (Links to External Site)
Cause:   Boundary error
Underlying OS:  UNIX (SGI/IRIX)

Message History:   None.


 Source Message Contents

Subject:  IRIX Xlib vulnerability


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

_____________________________________________________________________________

                          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------

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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-----END PGP SIGNATURE-----
    Copyright 2001, Silicon Graphics, Inc. All Rights Reserved.
    http://wwww.sgi.com/support/security/


 
 


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