SGI Information for VU#312313

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


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




                         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:

CERT assigned the following CVE candidates to this vulnerability:

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

  # /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

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

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


     1) This version of the IRIX operating has been retired. Upgrade to an
       actively supported IRIX operating system.  See for more

     2) If you have not received an IRIX 6.5.X CD for IRIX 6.5, contact your
       SGI Support Provider or URL:

     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: and

SGI Security Patches can be found at: and

SGI patches for IRIX can be found at the following patch servers: and

SGI freeware updates for IRIX can be found at:

SGI fixes for SGI open sourced code can be found on:

SGI patches and RPMs for Linux can be found at: or

SGI patches for Windows NT or 2000 can be found at:

IRIX 5.2-6.4 Recommended/Required Patch Sets can be found at: and

IRIX 6.5 Maintenance Release Streams can be found at:

IRIX 6.5 Software Update CDs can be obtained from:

The primary SGI anonymous FTP site for security advisories and patches is (  Security advisories and patches are
located under the URL

For security and patch management reasons, (mirrors 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


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Version: 2.6.2


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