AUSCERT External Security Bulletin Redistribution
            ESB-98.187 -- SGI Security Advisory 19981201-01-PX
                   Vulnerability in IRIX fcagent daemon
                            11 December 1998


Silicon Graphics Inc. has released the following advisory concerning a
vulnerability in the RPC based fcagent(1m) daemon used to service requests
for status and configuration of a FibreVault enclosure. This vulnerability
can be used to establish a denial of service rendering the FibreVault
unavailable. A local user account on the vulnerable system is not required
in order to exploit this vulnerability.

- ---------------------------BEGIN INCLUDED TEXT--------------------


                Silicon Graphics Inc. Security Advisory

        Title:   Vulnerability in IRIX fcagent daemon
        Number:  19981201-01-PX
        Date:    December 10,1998

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

The IRIX fcagent(1m) service is an RPC based daemon which is called to service
requests about status or configuration of a FibreVault enclosure.

Unfortunately, a vulnerability in the fcagent(1m) daemon has been discovered
which can lead to a denial of service that can disable the FibreVault.

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 vulnerable SGI systems.
This issue has been corrected in future releases of IRIX.

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

The fcagent(1m) daemon is installed by default on Origin and Onyx2 platforms
running IRIX 6.4 and higher.

A local user account on the vulnerable system is not required in order to
exploit the fcagent(1m) daemon.

The vulnerability can be exploited remotely by using carefully crafted RPC
packets that are sent to the fcagent(1m) daemon.

The vulnerability can be used to establish a denial of service rendering the
FibreVault unavailable.

This vulnerability was discovered internally by SGI and is believe not to
have been publicly discussed outside of SGI.

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

Although patches are available for this issue, it is realized that
there may be situations where installing the patches immediately may
not be possible.

The steps below can be used to disable the fcagent(1m) daemon thereby
removing the vulnerability until patches can be installed.

      **** WARNING ****

      Disabling the fcagent(1m) daemon will prevent configuration and
      status monitoring of the FibreVault enclosure.

     1) Become the root user on the system.

              % /bin/su -

     2) Verify fcagent(1m) daemon is enabled.

              # chkconfig

              Flag                 State
              ====                 =====
              fcagent              on

     3) Disable fcagent(1m) daemon.

              # chkconfig fcagent off

     4) Verify fcagent(1m) daemon has been disabled.

              # chkconfig

              Flag                 State
              ====                 =====
              fcagent              off

     5) Stop any currently running fcagent(1m) daemon.

              # /etc/init.d/fcagent stop

     6) Return to previous level.

              # exit

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

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

   IRIX 3.x          no                        Note 1
   IRIX 4.x          no                        Note 1
   IRIX 5.0.x        no                        Note 1
   IRIX 5.1.x        no                        Note 1
   IRIX 5.2          no                        Note 1
   IRIX 5.3          no                        Note 2
   IRIX 6.0.x        no                        Note 1
   IRIX 6.1          no                        Note 1
   IRIX 6.2          no
   IRIX 6.3          no                        Note 2
   IRIX 6.4          yes           3440        Note 2 & 3
   IRIX 6.5          yes           6.5.2       Note 3 & 4
   IRIX 6.5.1        yes           6.5.2       Note 3 & 4
   IRIX 6.5.2        no                        Note 5


     1) Upgrade to currently supported IRIX operating system. See
        http://support.sgi.com/news/irix2.html for more information.
     2) This version of the IRIX operating system is in maintenance mode
        and patches will no longer be produced when it retires. See
        http://support.sgi.com/news/irix1.html for more information.
     3) See "Temporary Solution" section.
     4) IRIX 6.5.2 needs to be installed to remove this vulnerability.
     5) If you have not received an IRIX 6.5.2 CD for IRIX 6.5, contact your
        SGI Support Provider or download the IRIX 6.5.2 Maintenance Release
        Stream from http://support.sgi.com/ or
        Information about installing IRIX 6.5.2 can be found at:

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

The primary SGI anonymous FTP site for security information and patches
is sgigate.sgi.com ( Security information and patches can be
found in the ~ftp/security and ~ftp/patches directories, respectively.

For security and patch management reasons, ftp.sgi.com (mirror of sgigate) lags
behind and does not do a real-time update of ~ftp/security and ~ftp/patches

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

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

Filename:                 README.patch.3440
Algorithm #1 (sum -r):    04125 25 README.patch.3440
Algorithm #2 (sum):       27101 25 README.patch.3440
MD5 checksum:             E24670EF4CAEC9FAA245D98F71BA10FD

Filename:                 patchSG0003440
Algorithm #1 (sum -r):    51443 6 patchSG0003440
Algorithm #2 (sum):       6348 6 patchSG0003440
MD5 checksum:             675AD6BEAB8C42B3EA1546A5007803F8

Filename:                 patchSG0003440.eoe_man
Algorithm #1 (sum -r):    23082 50 patchSG0003440.eoe_man
Algorithm #2 (sum):       38976 50 patchSG0003440.eoe_man
MD5 checksum:             4AD4D5A60D28FD2635CA424109652A5A

Filename:                 patchSG0003440.eoe_sw
Algorithm #1 (sum -r):    55220 1145 patchSG0003440.eoe_sw
Algorithm #2 (sum):       13442 1145 patchSG0003440.eoe_sw
MD5 checksum:             87A6651CA9A03767EA18BCEEBD689D1C

Filename:                 patchSG0003440.idb
Algorithm #1 (sum -r):    10193 12 patchSG0003440.idb
Algorithm #2 (sum):       27908 12 patchSG0003440.idb
MD5 checksum:             4CC99C3F82F35F989BEEBDBFC7C3C02A

Filename:                 patchSG0003440.irix_dev_gifts
Algorithm #1 (sum -r):    06478 6 patchSG0003440.irix_dev_gifts
Algorithm #2 (sum):       6724 6 patchSG0003440.irix_dev_gifts
MD5 checksum:             AA15FAE1A7D6D95B16328C0C37951F3B

- - -----------------------------------------------------------
- - --- 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.

Version: 2.6.2


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