AUSCERT External Security Bulletin Redistribution

                   ESB-2001.513 -- SGI Security Advisory
                            CDE vulnerabilities
                              3 December 2001


        AusCERT Security Bulletin Summary

Product:                CDE 5.0
                        CDE 5.1
Vendor:                 SGI
Operating System:       IRIX 6.5 to 6.5.14
Impact:                 Root Compromise
Access Required:        Remote

Ref:                    ESB-2001.480

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


                          SGI Security Advisory

         Title:    CDE vulnerabilities
        Number:    20011107-01-P
     Reference:    CERT CA-2001-31
          Date:    November 30, 2001

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

Security Focus has reported that several suid root CDE utilities have buffer
overruns which can lead to security compromises.  These utilities are
"dtaction", "dtprintinfo", "dtterm", "dtsession", and "dtspcd".

There is a related issue with the CDE ToolTalk "ttsession" messaging
server's usage of a weak RPC authentication mechanism. Because of this, the
ttsession process can be manipulated to execute unauthorized arbitrary
programs with the privileges of the running ttsession.

SGI has investigated the issues 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 future releases of CDE.

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

CDE is an optional product and is not installed by default.

The dtspcd and ttsession vulnerabilities can be exploited by a remote user.
The other vulnerabilities would require a local user account on the host
system in order to exploit them.

The exploitation of these vulnerabilities can lead to a root compromise.

These vulnerabilities have been reported by Security Focus, CERT, BugTraq,
Last Stage of Delirium Research Group, and ISS, and have been publicly
discussed in Usenet newsgroups and security mailing lists.

CERT® Advisory CA-2001-31 Buffer Overflow in CDE Subprocess Control Service:

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

SGI acknowledges that it may not always be possible to immediately install
patches or upgrade the operating system.  In those cases, we recommend
removing the suid bit from the relevant binaries until the patch can be
applied. This will result in reduced functionality of the system, and will
not completely secure the system from these vulnerabilities.

If you want to do this, please follow this procedure:

       % su - root
       # cd /usr/dt/bin
       # chmod 755 dtaction
       # chmod 755 dtprintinfo
       # chmod 755 dtsession
       # chmod 755 dtterm
       # chmod 755 rpc.ttdbserverd
       # exit

It is not necessary to reboot the system after doing this.  You should
install the patch or upgrade to a later version of CDE as soon as it is
possible to do so.

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

SGI has provided a patch for CDE 5.1 which can be applied to an IRIX
6.5.x system with CDE installed.  The problem will be fixed in a future
release of CDE.

   CDE Version     Vulnerable?     Patch #      Other Actions
   -----------     -----------     -------      -------------
   CDE 5.0           unknown                    Note 1
   CDE 5.1            yes            4416       Note 2


     1) This version of CDE has been retired. For more information, see
        Software Product Knowledge Database http://support.sgi.com/spk/

     2) This patch can be installed on IRIX 6.5-6.5.14 with CDE 5.1

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

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

Filename:                 README.patch.4416
Algorithm #1 (sum -r):    36835 8 README.patch.4416
Algorithm #2 (sum):       53529 8 README.patch.4416
MD5 checksum:             5CB39FFFABF73E391A462E64DB4A63DD

Filename:                 patchSG0004416
Algorithm #1 (sum -r):    39697 3 patchSG0004416
Algorithm #2 (sum):       14998 3 patchSG0004416
MD5 checksum:             C1BB56CB64AFD836F002DB1DADA594D0

Filename:                 patchSG0004416.cde_sw
Algorithm #1 (sum -r):    33090 4336 patchSG0004416.cde_sw
Algorithm #2 (sum):       43662 4336 patchSG0004416.cde_sw
MD5 checksum:             4A2D8F97737823CAB1B6F581B9BA1722

Filename:                 patchSG0004416.idb
Algorithm #1 (sum -r):    58676 4 patchSG0004416.idb
Algorithm #2 (sum):       15813 4 patchSG0004416.idb
MD5 checksum:             8F2B1C356965B35AD874E055C221032B

- - -------------------
- - --- Information ---
- - -------------------

SGI Security Advisories can be found at:
http://www.sgi.com/support/security/ and

SGI Security Patches can be found at:
http://www.sgi.com/support/security/ and

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:

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

SGI patches and RPMs for Linux can be found at:
http://support.sgi.com/linux/ 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:
http://support.sgi.com/irix/ and ftp://patches.sgi.com/support/patchset/

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
patches.sgi.com (  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.

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

SGI wishes to thank Security Focus, CERT, BugTraq, Last Stages of Delirium
Research Group, ISS and the users of the Internet Community at large for
their assistance in this matter.

- - -----------------------------------------
- - --- SGI Security Information/Contacts ---
- - -----------------------------------------

If there are questions about this document, email can be sent to


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 (  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:

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.


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>

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.


SGI provides a comprehensive customer World Wide Web site. This site is
located at http://www.sgi.com/support/security/ .


If there are general security questions on SGI systems, email can be sent to

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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