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Category:   Application (Generic)  >   Xfsmd Vendors:   SGI (Silicon Graphics)
SGI IRIX 'xfsmd' Daemon RPC Authentication Weaknesses May Let Remote Users Gain Root Access on the System
SecurityTracker Alert ID:  1004609
SecurityTracker URL:  http://securitytracker.com/id/1004609
CVE Reference:   CVE-2002-0359   (Links to External Site)
Date:  Jun 21 2002
Impact:   Root access via network
Vendor Confirmed:  Yes  Exploit Included:  Yes  

Description:   A vulnerability has been reported in SGI's 'xfsmd' daemon for the IRIX operating system. A remote user may be able to obtain root access on the system.

SGI reports that the Last Stage of Delirium (LSD) Research Group has disclosed several vulnerabilities in the xfsmd service. According to LSD, the service provides a weak RPC authentication scheme for potentially dangerous RPC functions and uses the libc popen() function call in an unsafe manner. More information is available at:

http://www.lsd-pl.net/files/get?IRIX/irx_xfsmd

SGI indicates that the /usr/etc/xfsmd daemon is part of the optional eoe.sw.xfsmserv package and is not installed by default on IRIX 6.5 systems. However, if the package is installed, it will apparently run by default.

Demonstration exploit code is available at:

http://www.lsd-pl.net/code/IRIX/irx_xfsmd.c

Impact:   A remote user may be able to obtain root access on the system.
Solution:   No solution was available at the time of this entry.

SGI reports that the /usr/etc/xfsmd daemon is part of the optional eoe.sw.xfsmserv package, which is being retired. SGI has no plans to fix the xfsmd security issue.

SGI recommends either disabling or uninstalling the product.

To disable the product from running, perform the following steps:

# killall /usr/etc/xfsmd
# vi /etc/inetd.conf

Look for a line in inetd.conf that looks like this:

sgi_xfsmd/1 stream rpc/tcp wait root ?/usr/etc/xfsmd xfsmd

...and comment it out by putting a "#" at the beginning of the line:

#sgi_xfsmd/1 stream rpc/tcp wait root ?/usr/etc/xfsmd xfsmd

...or simply remove the line from the file.

# killall -HUP inetd

To remove the product from the system, perform the following command:

# versions remove eoe.sw.xfsmserv

Vendor URL:  www.sgi.com/support/security/ (Links to External Site)
Cause:   Authentication error
Underlying OS:  UNIX (SGI/IRIX)
Underlying OS Comments:  6.5.x

Message History:   None.


 Source Message Contents

Subject:  IRIX xfsmd vulnerability


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

_____________________________________________________________________________

                          SGI Security Advisory

        Title:      xfsmd vulnerability
        Number:     20020605-01-I
        Date:       June 20, 2002
        Reference:  CAN-2002-0359
_____________________________________________________________________________

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

It's been reported that the /usr/etc/xfsmd daemon has security
vulnerabilities which can lead to a remote root exploit.

See http://www.lsd-pl.net/ for more information.

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.

Since the xfsmserv product is being retired, SGI has no plans to fix the
xfsmd security issue.


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

The /usr/etc/xfsmd daemon is part of the optional eoe.sw.xfsmserv package,
and is not installed by default on IRIX 6.5 systems. but if it is installed,
it will run by default.

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

  # uname -R

That will return a result similar to the following:

  # 6.5 6.5.15f

The first number ("6.5") is the release name, the second ("6.5.15f" in this
case) is the extended release name.  The extended release name is the
"version" we refer to throughout this document.

To see if xfsmd is installed, execute the following command:

  # versions eoe.sw.xfsmserv
  I = Installed, R = Removed

   Name                 Date        Description

   I  eoe                  08/28/2001  IRIX Execution Environment, 6.5.13f
   I  eoe.sw               08/28/2001  IRIX Execution Environment Software
   I  eoe.sw.xfsmserv      08/28/2001  XFSM Server Software

If the output resembles the above, then the package is installed and the
system is vulnerable.

This vulnerability was assigned the following CVE:
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2002-0359


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

There is no effective workaround available for these problems.
SGI recommends either disabling or uninstalling the product.

To disable the product from running, perform the following steps:

  # killall /usr/etc/xfsmd
  # vi /etc/inetd.conf

  Look for a line in inetd.conf that looks like this:

    sgi_xfsmd/1 stream  rpc/tcp wait    root    ?/usr/etc/xfsmd     xfsmd

  ...and comment it out by putting a "#" at the beginning of the line:

    #sgi_xfsmd/1 stream  rpc/tcp wait    root    ?/usr/etc/xfsmd     xfsmd

  ...or simply remove the line from the file.

  # killall -HUP inetd

To remove the product from the system, perform the following command:

  # versions remove eoe.sw.xfsmserv


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

SGI will not be providing a fix or patches for this issue, as the product is
being retired. Our recommendation is to follow the instructions in the
Temporary Workaround section above.

   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       yes                       Notes 2 & 3
   IRIX 6.5.15       yes                       Notes 2 & 3
   IRIX 6.5.16       yes                       Notes 2 & 3

   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) Disable or uninstall the product.


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

SGI wishes to thank The Last Stages of Delirium Research Group at
http://www.lsd-pl.net/ 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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