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>>                                                      CERT-NL, 01-Mar-2000 <<
>> All CERT-NL information has been moved to http://cert.surfnet.nl.  Links  <<
>> to CERT-NL information contained in this advisory are therefore outdated. <<
>>                                                                           <<
>> CERT-NL also has stopped the CERT-CC-Mirror service.  Due to this the     <<
>> links to the CERT-CC mirror are obsolete. Visit the CERT-CC site for the  <<
>> complete CERT-CC advisory texts:                     http://www.cert.org  <<
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Security Advisory                                                       CERT-NL
===============================================================================
Author/Source : CERT-NL                                     Index  :    S-92-12
Distribution  : SURFnet Constituency                        Page   :          1
Classification: External                                    Version:      final
Subject       : SunOS /usr/etc/rpc.mountd Vulnerability      Date   :  28-may-92
===============================================================================

CERT-NL (SURFnet Computer Emergency Response Team) has received
information concerning a security problem in SunOS /usr/etc/rpc.mountd.

CERT-NL wishes to thank CERT/CC for bringing this to our attention.

===========================================================================
CA-92:12                      CERT Advisory
                              May 28, 1992
         Revised Patch for SunOS /usr/etc/rpc.mountd Vulnerability

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

                   *** THIS IS A REVISED CERT ADVISORY ***
          *** IT CONTAINS NEW VULNERABILITY AND PATCH INFORMATION ***
                  *** SUPERSEDES CERT ADVISORY CA-91:09 ***

The Computer Emergency Response Team/Coordination Center (CERT/CC) has
received information concerning the availability of a revised security
patch for /usr/etc/rpc.mountd in Sun Microsystems Computer Corporation
operating systems.  This patch fixes an additional vulnerability that
was not addressed in CERT advisory CA-91:09.SunOS.rpc.mountd.vulnerability.

Sun has provided patches for SunOS 4.1, SunOS 4.1_PSR_A, SunOS 4.1.1,
and SunOS 4.1.2.  These patches are available through your local Sun
Answer Center as well as through anonymous ftp from ftp.uu.net (137.39.1.9)
in the /systems/sun/sun-dist directory.

Patch ID and file information are as follows:

Fix                     Patch ID       Filename            Checksum
/usr/etc/rpc.mountd     100296-02      100296-02.tar.Z     30606    23

Please note that Sun Microsystems sometimes updates patch files.  If you
find that the checksum is different, please contact Sun Microsystems or
the CERT/CC for verification.

- ---------------------------------------------------------------------------
I.   Description

     Under certain conditions an exported NFS filesystem can be
     mounted by any system on the Internet even though it may appear
     that access to the filesystem is restricted to specific hosts.

II.  Impact

     Unauthorized remote hosts will be able to mount the exported filesystem.

III. Solution

     As root:

     1.  Move the existing rpc.mountd aside and change the permissions.

         # mv /usr/etc/rpc.mountd /usr/etc/rpc.mountd.OLD
         # chmod 400 /usr/etc/rpc.mountd.OLD

     2.  Install the new version

         # cp `arch`/rpc.mountd /usr/etc
         # chown root.staff /usr/etc/rpc.mountd
         # chmod 755 /usr/etc/rpc.mountd

     3.  Kill the currently running rpc.mountd and restart it, or
         reboot the system.  In either case, systems with filesystems
         mounted from this host will have interruptions in service.

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

==============================================================================
CERT-NL is the Computer Emergency Response Team for SURFnet customers. SURFnet
is the Dutch network for educational, research and related institutes. CERT-NL
is a member of the Forum of Incident Response and Security Teams (FIRST).

All CERT-NL material is available under:
  http://cert.surfnet.nl/

In case of computer or network security problems please contact your local
CERT/security-team or CERT-NL  (if your institute is NOT a SURFnet customer
please address the appropriate (local) CERT/security-team).

CERT-NL is one/two hour(s) ahead of UTC (GMT) in winter/summer,
i.e. UTC+0100 in winter and UTC+0200 in summer (DST).

   Email:     cert-nl@surfnet.nl     ATTENDED REGULARLY ALL DAYS
   Phone:     +31 302 305 305        BUSINESS HOURS ONLY
   Fax:       +31 302 305 329        BUSINESS HOURS ONLY
   Snailmail: SURFnet bv
              Attn. CERT-NL
              P.O. Box 19035
              NL - 3501 DA  UTRECHT
              The Netherlands

NOODGEVALLEN:    06 22 92 35 64      ALTIJD BEREIKBAAR
EMERGENCIES : +31 6 22 92 35 64      ATTENDED AT ALL TIMES
CERT-NL'S EMERGENCY PHONENUMBER IS ONLY TO BE USED IN CASE OF EMERGENCIES:
THE SURFNET HELPDESK OPERATING THE EMERGENCY NUMBER HAS A *FIXED*
PROCEDURE FOR DEALING WITH YOUR ALERT AND WILL IN REGULAR CASES RELAY IT
TO CERT-NL IN AN APPROPRIATE MANNER. CERT-NL WILL THEN CONTACT YOU.
===============================================================================

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