IRIX 6.3 NetWare Client 1.0 Vulnerabilities

[agent99 () BOYTOY CSD SGI COM (SGI Security Coordinator)]

DISTRIBUTION RESTRICTIONS - NONE - FOR PUBLIC RELEASE

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______________________________________________________________________________
                Silicon Graphics Inc. Security Advisory

        Title:   IRIX 6.3 NetWare Client 1.0 Vulnerabilities
        Number:  19980501-01-P2869
        Date:    May 27th, 1998
______________________________________________________________________________

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

Silicon Graphics 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
Silicon Graphics 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.
______________________________________________________________________________

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

The NetWare Client subsystem provides software to communicate with NetWare
Servers with file sharing and remote printing capabilities.

Unfortunately, several vulnerabilities have been discovered with NetWare Client
1.0 on IRIX 6.3 which can lead to a root compromise on the system.

Silicon Graphics Inc. 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 will be corrected in future releases of IRIX.


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

The NetWare Client 1.0 software subsystem is installed by default on IRIX 6.3.

A user account on the vulnerable system is required in order to exploit
NetWare Client 1.0 locally and remotely which can lead to root access.

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


- ---------------------------
- ---- Temporary Solution ---
- ---------------------------

Although patches are available for this issue, it is realized that
there may be situations where installing the patches immediately may
not be possible.

The steps below can be used to remove the vulnerability by removing
the permissions of the NetWare Client 1.0 programs.



     1) Become the root user on the system.

                % /bin/su -
                Password:
                #


     2) Verify a vulnerable NetWare Client 1.0 software subsystem is installed.
        Only NetWare Client 1.0 on IRIX 6.3 is vulnerable.

                #  versions -b netwr_client
                I = Installed, R = Removed

                   Name                 Date      Description
                I  netwr_client         04/30/97  NetWare Client 1.0


     3) Change the permissions on the vulnerable NetWare Client 1.0 programs.

                # /bin/chmod 500 /usr/etc/netware/ipxchk
                # /bin/chmod 500 /usr/etc/netware/ipxlink


     4) Verify the new permissions on the program.
        Note that the program sizes may be different depending on release.

                # ls -l /usr/etc/netware/ipxchk
                -r-x------ 1 root   sys   9076 Feb 18 13:50 ipxchk

                # ls -l /usr/etc/netware/ipxlink
                -r-x------ 1 root   sys  21412 Feb 18 13:50 ipxlink

     5) Return to previous user level.

                # exit
                $


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

   OS Version     Vulnerable?     Patch #      Other Actions
   ----------     -----------     -------      -------------

   IRIX 3.x          no
   IRIX 4.x          no
   IRIX 5.0.x        no
   IRIX 5.1.x        no
   IRIX 5.2          no
   IRIX 5.3          no
   IRIX 6.0.x        no
   IRIX 6.1          no
   IRIX 6.2          no
   IRIX 6.3          yes           2869
   IRIX 6.4          no


  Patches are available via anonymous FTP and your service/support provider.

The SGI anonymous FTP site is sgigate.sgi.com (204.94.209.1) or its
mirror, ftp.sgi.com.  Security information and patches can be found
in the ~ftp/security and ~ftp/patches directories, respectfully.



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

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

Filename:                 README.patch.2869
Algorithm #1 (sum -r):    52839 9 README.patch.2869
Algorithm #2 (sum):       1764 9 README.patch.2869
MD5 checksum:             1236AB82847EC3E53277B70989766F47

Filename:                 patchSG0002869
Algorithm #1 (sum -r):    52950 3 patchSG0002869
Algorithm #2 (sum):       40584 3 patchSG0002869
MD5 checksum:             8164932F4667258378598852C64090BC

Filename:                 patchSG0002869.idb
Algorithm #1 (sum -r):    12067 6 patchSG0002869.idb
Algorithm #2 (sum):       30180 6 patchSG0002869.idb
MD5 checksum:             A33FB43AADBC15B98ABF42079BB63336

Filename:                 patchSG0002869.netwr_client_sw
Algorithm #1 (sum -r):    08086 210 patchSG0002869.netwr_client_sw
Algorithm #2 (sum):       55842 210 patchSG0002869.netwr_client_sw
MD5 checksum:             49C619A6FA7FBA9102D1C566C9B1E736

Filename:                 patchSG0002869.sysadmdesktop_sw
Algorithm #1 (sum -r):    22870 690 patchSG0002869.sysadmdesktop_sw
Algorithm #2 (sum):       28194 690 patchSG0002869.sysadmdesktop_sw
MD5 checksum:             4932DB35E7C275CC846B31293A0BE5F6


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

Silicon Graphics wishes to thank AUSCERT and the Internet community at
large for their assistance in this matter.


- ------------------------------------------------------------
- ---- Silicon Graphics Inc. Security Information/Contacts ---
- ------------------------------------------------------------

If there are questions about this document, email can be sent to
cse-security-alert () sgi com.

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

Silicon Graphics 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 information and patches
is sgigate.sgi.com (204.94.209.1).  Security information and patches
are located under the directories ~ftp/security and ~ftp/patches,
respectively. The Silicon Graphics Security Headquarters Web page is
accessible at the URL http://www.sgi.com/Support/security/security.html.

For issues with the patches on the FTP sites, email can be sent to
cse-security-alert () sgi com.

For assistance obtaining or working with security patches, please
contact your SGI support provider.

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

Silicon Graphics 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
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% 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
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control-d (^d) is used to indicate to the mail program that you are
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                      ------oOo------

Silicon Graphics provides a comprehensive customer World Wide Web site.
This site is located at http://www.sgi.com/Support/security/security.html.

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

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, Silicon
  Graphics is appropriately credited and the document retains and
  includes its valid PGP signature.


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