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Category:   Application (Generic)  >   Name Service Daemon (nsd) Vendors:   SGI (Silicon Graphics)
SGI IRIX Unified Name Service Daemon (nsd) Symlink Bug May Let Local Users Obtain Root Privileges on the System
SecurityTracker Alert ID:  1004204
SecurityTracker URL:  http://securitytracker.com/id/1004204
CVE Reference:   CVE-2002-0174   (Links to External Site)
Date:  May 1 2002
Impact:   Modification of authentication information, Modification of system information, Modification of user information, Root access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   A file permission vulnerability was reported in SGI's IRIX unified Name Service Daemon (nsd). A local user may be able to gain root privileges on the system.

SGI reports that nsd fails to check the permissions and ownership of its dump file "/var/tmp/nsd.dump" prior to writing to it. A local user could create a symbolic link (symlink) from another critical file to /var/tmp/nsd.dump. Then, if another privileged user sends a 'USR1' signal to the nsd process, the nsd process may write to the temporary dump file name, causing the linked file to be modified with root level privileges.

According to the report, a local user could exploit this to gain root level access on the system.

The nsd daemon is reportedly installed by default on IRIX 6.5 systems as part of eoe.sw.base.

Impact:   A local user may be able to cause the nsd process to write to an arbitrary file with root level permissions.
Solution:   SGI has not provided patches for this vulnerability. but has fixed the issue in IRIX 6.5.11 or later.

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, no,,
IRIX 6.5.12, no,,
IRIX 6.5.13, no,,
IRIX 6.5.14, no,,
IRIX 6.5.15, no,,
IRIX 6.5.16, 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) 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) Upgrade to IRIX 6.5.11 or a later version of IRIX.

Vendor URL:  www.sgi.com/ (Links to External Site)
Cause:   Access control error
Underlying OS:  UNIX (SGI/IRIX)
Underlying OS Comments:  6.5 - 6.5.10

Message History:   None.


 Source Message Contents

Subject:  IRIX nsd symlink vulnerability


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

_____________________________________________________________________________

                          SGI Security Advisory

        Title:      IRIX nsd symlink vulnerability
        Number:     20020501-01-I
        Date:       May 1, 2002
        Reference:  CAN-2002-0174
______________________________________________________________________________

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

It has been reported that nsd was not checking the permissions and ownership
of its dump file "/var/tmp/nsd.dump" prior to writing to it.

If a user was to first create a symlink from another file pointing to
/var/tmp/nsd.dump and then an already-privileged user sent a USR1 signal to
the nsd process, the file could be damaged or modified. If successfully
exploited, this could lead to a root compromise.

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.


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

The nsd daemon is installed by default on IRIX 6.5 systems as part of
eoe.sw.base.

This vulnerability may not be exploited by a remote user, a local account
is required.

This vulnerability has been fixed in IRIX 6.5.11.

This vulnerability was assigned the following CVE:
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2002-0174


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

There is no effective workaround for this problem.  SGI's recommendation
is to upgrade to IRIX 6.5.11 or later.


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

SGI has not provided patches for this vulnerability. Our recommendation is
to upgrade to IRIX 6.5.11 or later.


   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       no
   IRIX 6.5.12       no
   IRIX 6.5.13       no
   IRIX 6.5.14       no
   IRIX 6.5.15       no
   IRIX 6.5.16       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) 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) Upgrade to IRIX 6.5.11 or a later version of IRIX.


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

SGI wishes to thank FIRST and the users of the Internet Community at
large 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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