SGI Information for VU#312313

Solaris X Window Font Service (XFS) daemon contains buffer overflow in Dispatch() function

Status

Not Affected

Vendor Statement

We're not vulnerable to this.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Vendor References

None

Addendum

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______________________________________________________________________________
                         SGI Security Advisory

Title    : Buffer Overflow Vulnerability in X Font Server
Number   : 20021202-01-I
Date     : December 4, 2002
Reference: CERT CA-2002-34, VU#312313
Reference: ISS X-Force Alert #21541
Reference: CVE CAN-2002-1317
Fixed in : IRIX 6.5.14
______________________________________________________________________________

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

It's been reported that there is a buffer overflow vulnerability in the
X font server used in IRIX versions prior to 6.5.14. It was discovered,
as part of the non-security related X11 updates done to IRIX 6.5.14,
this vulnerability was fixed.

See the following URLs for additional details:

  http://www.cert.org/advisories/CA-2002-34.html
 
http://www.kb.cert.org/vuls/id/312313
 
http://bvlive01.iss.net/issEn/delivery/xforce/alertdetail.jsp?oid=21541

CERT assigned the following CVE candidates to this vulnerability:
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2002-1317

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 has been corrected in IRIX 6.5.14 and later versions.


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

The /usr/bin/X11/xfs binary is installed by default on IRIX 6.5 systems as
part of x_eoe.sw.Server.

To determine the version of IRIX you are running, execute the following
command:

  # /bin/uname -R

That will return a result similar to the following:

  # 6.5 6.5.16f

The first number ("6.5") is the release name, the second ("6.5.16f" in this
case) is the extended release name.  The extended release name is the
"version" we refer to throughout this document.

This vulnerability can be exploited by a remote user (no account on the
local machine is required), and can result in the remote user gaining root
access.


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

SGI understands that there are times when upgrading the operating system or
installing patches are inconvenient or not possible.  In those instances, we
recommend the following workaround:

   # chkconfig fontserver off

   # /etc/init.d/fontserver stop

Of course, you will no longer have the services of the font server available
after doing this.

SGI recommends upgrading to IRIX 6.5.14 or later as a permanent fix for this
problem.


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

SGI has not provided patches for this vulnerability. Our recommendation is
to upgrade to IRIX 6.5.14 or later.


   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       yes                       Notes 2 & 3
  IRIX 6.5.13       yes                       Notes 2 & 3
  IRIX 6.5.14        no
  IRIX 6.5.15        no
  IRIX 6.5.16        no
  IRIX 6.5.17        no
  IRIX 6.5.18        no
  IRIX 6.5.19        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 6.5.14 or later.


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

SGI wishes to thank ISS X-Force 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
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subscribe wiretap <YourEmailAddress such as zedwatch@sgi.com >
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In the example above, <YourEmailAddress> is the email address that you wish
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                      ------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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