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Category:   Application (Generic)  >   Name Service Daemon (nsd) Vendors:   SGI (Silicon Graphics)
(SGI Issues Updated Advisory) Re: SGI IRIX Unified Name Service Daemon (nsd) Cache Bug Lets Remote Users Cause the Daemon to Consume All System Disk Space
SecurityTracker Alert ID:  1003270
SecurityTracker URL:  http://securitytracker.com/id/1003270
CVE Reference:   CVE-2002-0038   (Links to External Site)
Date:  Jan 17 2002
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   SGI reported a denial of service vulnerability in their IRIX unified name service daemon (nsd). A remote user can cause the server to consume the system disk space.

A bug in the cache-limiting function apparently allows a remote user to cause the cache to grow and eventually fill the system disk, causing denial of service conditions.

Impact:   A remote user can cause the server to consume all available system disk space.
Solution:   The vendor has issued a fix and recommends that all users upgrade.

SGI has provided a patch for these vulnerabilities for IRIX 6.5.11. The problem has been fixed in IRIX 6.5.12. SGI recommends upgrading to IRIX 6.5.12 or later.

A patch matrix is provided in the Source Message.

Vendor URL:  www.sgi.com/ (Links to External Site)
Cause:   Resource error
Underlying OS:  UNIX (SGI/IRIX)
Underlying OS Comments:  IRIX 6.5.4m/f through 6.5.11m/f

Message History:   This archive entry is a follow-up to the message listed below.
Jan 16 2002 SGI IRIX Unified Name Service Daemon (nsd) Cache Bug Lets Remote Users Cause the Daemon to Consume All System Disk Space



 Source Message Contents

Subject:  IRIX nsd vulnerability update


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

______________________________________________________________________________
                          SGI Security Advisory

        Title:     IRIX nsd vulnerability
        Number:    20020102-03-P
        Date:      January 16, 2002
        Reference: CVE CAN-2002-0038
______________________________________________________________________________

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

Corrected patch information from the original advisory and added CVE
reference.


- -----------------------
- --- 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 was assigned the following CVE number:
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2002-0038

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            4236       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 http://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:
        http://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: http://support.sgi.com/irix/swupdates/

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

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

Filename:                 README.patch.4236
Algorithm #1 (sum -r):    35375 7 README.patch.4236
Algorithm #2 (sum):       16317 7 README.patch.4236
MD5 checksum:             39415715F50397A648C2834ED6ACDD4D

Filename:                 patchSG0004236
Algorithm #1 (sum -r):    32301 2 patchSG0004236
Algorithm #2 (sum):       65494 2 patchSG0004236
MD5 checksum:             8CB4D0CBE5761B4D40A414640CAFE604

Filename:                 patchSG0004236.eoe_sw
Algorithm #1 (sum -r):    28311 297 patchSG0004236.eoe_sw
Algorithm #2 (sum):       46666 297 patchSG0004236.eoe_sw
MD5 checksum:             59FBD7D3EF93DD44828633C6E1B059D5

Filename:                 patchSG0004236.eoe_sw64
Algorithm #1 (sum -r):    27672 60 patchSG0004236.eoe_sw64
Algorithm #2 (sum):       46416 60 patchSG0004236.eoe_sw64
MD5 checksum:             4559D543CEF5D7CF98866136DB8CD058

Filename:                 patchSG0004236.idb
Algorithm #1 (sum -r):    59446 2 patchSG0004236.idb
Algorithm #2 (sum):       60091 2 patchSG0004236.idb
MD5 checksum:             88AACA23C15C530DCC0053C0C36940A3


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

users of the Internet Community at large for their assistance in this
matter.

SGI wishes to also thank Irene Kyriacou for reporting a patch error
in the original advisory.

SGI wishes to also thank Dave Ahmad and Jonathan Lapin for reporting
an issue with the PGP checksum of the original advisory.


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

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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