CERT Advisory CA-1991-09 Patch for SunOS /usr/etc/rpc.mountd

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CA-91:09                        CERT Advisory
                                July 15, 1991
                     Patch for SunOS /usr/etc/rpc.mountd

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                 *** SUPERSEDED BY CA-94:02 ***

The Computer Emergency Response Team/Coordination Center (CERT/CC) has
received information concerning the availability of a security patch
for /usr/etc/rpc.mountd in Sun Microsystems, Inc. operating systems.
This problem will be fixed in SunOS 5.0.  Patches are available for
SunOS 4.1, and SunOS 4.1.1 through your local Sun answer centers
worldwide as well as through anonymous ftp to ftp.uu.net (in ~ftp/sun-dist).
Patch ID and file information are as follows:

Fix                     Patch ID       Filename            Checksum
/usr/etc/rpc.mountd	100296-01      100296-01.tar.Z     01501   233

Please note that Sun Microsystems sometimes updates patch files.  If
you find that the checksum is different please contact Sun Microsystems
or us for verification.
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I.   DESCRIPTION:

     If an access list of hosts within /etc/exports is a string
     over 256 characters then the filesystem can be mounted by
     everyone.

II.  IMPACT:

     Unauthorized remote hosts will be able to mount the filesystem.

III. SOLUTION:

     As root:

     1.  Move the existing rpc.mountd aside

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

     2.  Install the new version

         # cp sun{3,3x,4,4c}/{4.1,4.1.1,4.1_PSR_A}/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.  Systems currently mounting filesystems
         from this host will have interruptions in service either
         way.

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If you believe that your system has been compromised, contact CERT/CC via
telephone or e-mail.

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

Internet E-mail: cert@cert.org
Telephone: 412-268-7090 24-hour hotline:
           CERT/CC personnel answer 7:30a.m.-6:00p.m. EST,
           on call for emergencies during other hours.

Past advisories and other computer security related information are available
for anonymous ftp from the cert.org (192.88.209.5) system.

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