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Security Bulletin 9216                  DISA Defense Communications System
May 28, 1992                Published by: DDN Security Coordination Center
                                     ([email protected])   1-(800) 365-3642

                       DEFENSE  DATA  NETWORK
                         SECURITY  BULLETIN

 The DDN SECURITY BULLETIN is distributed by the DDN SCC (Security
 Coordination Center) under DISA contract as a means of communicating
 information on network and host security exposures, fixes, and concerns
 to security and management personnel at DDN facilities.  Back issues may
 be obtained via FTP (or Kermit) from NIC.DDN.MIL [192.112.36.5]
 using login="anonymous" and password="guest".  The bulletin pathname is
 scc/ddn-security-yynn (where "yy" is the year the bulletin is issued
 and "nn" is a bulletin number, e.g. scc/ddn-security-9216).
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!                                                                       !
!     The following important  advisory was  issued by the Computer     !
!     Emergency Response Team (CERT)  and is being relayed unedited     !
!     via the Defense Information Systems Agency's Security             !
!     Coordination Center  distribution  system  as a  means  of        !
!     providing  DDN subscribers with useful security information.      !
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===========================================================================
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.

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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.

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

If you believe that your system has been compromised, contact CERT/CC or
your representative in FIRST (Forum of Incident Response and Security Teams).

Internet E-mail: [email protected]
Telephone: 412-268-7090 (24-hour hotline)
          CERT/CC personnel answer 7:30 a.m.-6:00 p.m. EST(GMT-5)/EDT(GMT-4),
          on call for emergencies during other hours.

Computer Emergency Response Team/Coordination Center (CERT/CC)
Software Engineering Institute
Carnegie Mellon University
Pittsburgh, PA 15213-3890

Past advisories, information about FIRST representatives, and other
information related to computer security are available for anonymous ftp
from cert.org (192.88.209.5).

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