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______________________________________________________________________________
                          SGI Security Advisory

        Title:   IRIX nsd vulnerability
        Number:  20020102-02-I
        Date:    January 15, 2002
______________________________________________________________________________

SGI provides this information freely to the SGI user community for its 
consideration, interpretation, implementation and use.   SGI recommends 
that this information be acted upon as soon as possible.

SGI 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 SGI 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.
______________________________________________________________________________

- --------------
- --- Update ---
- --------------

Removed erroneous patch information from the original advisory.


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

A vulnerability related to the way the IRIX unified name service daemon
(nsd) manages its cache files has been reported.

Due to a bug in a cache-limiting function, the cache can grow to eventually
fill the system disk.

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 future releases of IRIX.


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

The nsd daemon is installed by default on all 6.5.x versions of IRIX, and
this vulnerability exists in all versions of IRIX 6.5.4m/f through
6.5.11m/f.  The problem has been fixed in IRIX 6.5.12m/f.

A local user account on the vulnerable system is not required in order to
exploit this vulnerability.

The exploitation of this vulnerability can lead to a full system disk,
effectively resulting in a Denial of Service.

This vulnerability has been publicly discussed in Usenet newsgroups
and mailing lists.


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

SGI has provided a patch for these vulnerabilities for IRIX 6.5.11.
The problem has been fixed in IRIX 6.5.12. Our recommendation is to
upgrade to IRIX 6.5.12 or later.

   OS Version     Vulnerable?     Patch #      Other Actions
   ----------     -----------     -------      -------------    
   IRIX 3.x          no                        Note 1
   IRIX 4.x          no                        Note 1
   IRIX 5.x          no                        Note 1
   IRIX 6.0.x        no                        Note 1          
   IRIX 6.1          no                        Note 1         
   IRIX 6.2          no                        Note 1
   IRIX 6.3          no                        Note 1
   IRIX 6.4          no                        Note 1
   IRIX 6.5          no                        Notes 2 & 3
   IRIX 6.5.1        no                        Notes 2 & 3
   IRIX 6.5.2        no                        Notes 2 & 3
   IRIX 6.5.3        no                        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       no
   IRIX 6.5.13       no
   IRIX 6.5.14       no


   NOTES
 
     1) This version of the IRIX operating has been retired.
        Upgrade to an actively supported IRIX operating system. 
        See https://support.sgi.com/irix/news/index.html#policy 
        for more information.

     2) Download the IRIX 6.5.12 or later Maintenance Release Stream from
        the URL:
        https://support.sgi.com/colls/patches/tools/relstream/index.html

     3) If you have not received an IRIX 6.5.X CD for IRIX 6.5, contact your 
        SGI Support Provider or URL: https://support.sgi.com/irix/swupdates/


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

SGI wishes to thank Heiko Schlichting of Freie Universität Berlin and the
users of the Internet Community at large for their assistance in this
matter.


- ------------------
- --- References ---
- ------------------

SGI Security Advisories can be found at:
https://www.sgi.com/support/security/ and
ftp://patches.sgi.com/support/free/security/advisories/

SGI Security Patches can be found at:
https://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:
https://support.sgi.com/irix/ and ftp://patches.sgi.com/

SGI freeware updates for IRIX can be found at:
https://freeware.sgi.com/

SGI fixes for SGI open sourced code can be found on:
https://oss.sgi.com/projects/

SGI patches and RPMs for Linux can be found at:
https://support.sgi.com/linux/ or 
https://oss.sgi.com/projects/sgilinux-combined/download/security-fixes/

SGI patches for Windows NT or 2000 can be found at:
https://support.sgi.com/nt/

IRIX 5.2-6.4 Recommended/Required Patch Sets can be found at:
https://support.sgi.com/irix/ and ftp://patches.sgi.com/support/patchset/

IRIX 6.5 Maintenance Release Streams can be found at:
https://support.sgi.com/colls/patches/tools/relstream/index.html

IRIX 6.5 Software Update CDs can be obtained from:
https://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------

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                      ------oOo------

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                      ------oOo------

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                      ------oOo------

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______________________________________________________________________________
      This information is provided freely to all interested parties 
      and may be redistributed provided that it is not altered in any 
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