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Home : Advisories : Revised Patch for SunOS /usr/etc/rpc.mountd Vulnerability

Title: Revised Patch for SunOS /usr/etc/rpc.mountd Vulnerability
Released by: CERT
Date: 14th February 1994
Printable version: Click here

Hash: SHA1


CERT(sm) Advisory CA-94:02

Original issue date:  February 14, 1994

Last revised:September 19,1997  

             Attached copyright statement

              A complete revison history is at the end of this file.

Topic: Revised Patch for SunOS /usr/etc/rpc.mountd Vulnerability

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

                    *** THIS IS A REVISED CERT ADVISORY ***


             *** SUPERSEDES CERT ADVISORY CA-91:09 and CA-92:12 ***

The CERT Coordination Center has received information concerning a

vulnerability in /usr/etc/rpc.mountd in Sun Microsystems, Inc. SunOS

4.1.1, 4.1.2, 4.1.3, and 4.1.3c.  SunOS 4.1.3.u.1, Solaris 2.x, and

Solbourne's 4.1B and 4.1C are not vulnerable.

Sun has produced a patch for this vulnerability for sun3 and sun4

architectures.  It is available through your local Sun Answer Center

as well as through anonymous FTP from the ftp.uu.net system in the

/systems/sun/sun-dist directory or from the ftp.eu.net system in the

/sun/fixes directory.

This vulnerability is currently being exploited.  Please review CERT

Advisory CA-94:01 'Ongoing Network Monitoring Attacks'.

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

I.   Description

     If an access list of hosts within /etc/exports is a string

     over 256 characters or if the cached list of netgroups exceeds

     the cache capacity then the file system can be mounted by anyone.

II.  Impact

     Unauthorized remote hosts will be able to mount the file system.

     This will allow unauthorized users read and write access to files

     on mounted file systems.

III. Solution

     Obtain and install the appropriate patch following the instructions

     included with the patch.

     Patches are available from



     There is a README file and directory layout to help identify which

     binaries are appropriate for which architectures.

Patch-ID   Filename         BSD          MD5

                            Checksum     Checksum

100296-04  100296-04.tar.Z  15271    40  4e1354ecb7fb9c7e962d7020f31f07bf

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

If you believe that your system has been compromised, contact the CERT

Coordination Center or your representative in Forum of Incident

Response and Security Teams (FIRST).

Internet E-mail: cert@cert.org

Telephone: 412-268-7090 (24-hour hotline)

           CERT personnel answer 8:30 a.m.-5:00 p.m. EST(GMT-5)/EDT(GMT-4),

           and are on call for emergencies during other hours.

CERT Coordination Center

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 info.cert.org.

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

Copyright 1994,1995, 1996 Carnegie Mellon University. Conditions for use,

disclaimers, and sponsorship information can be found in

http://www.cert.org/legal_stuff.html and http://ftp.cert.org/pub/legal_stuff .

If you do not have FTP or web access, send mail to cert@cert.org with

"copyright" in the subject line.

CERT is registered in the U.S. Patent and Trademark Office.


Revision history

Sept. 19,1997  Attached copyrigth statement

Aug. 30, 1996  Information previously in the README was inserted

               into the advisory. Updated URL format.

June 09, 1995  Solution - recommended source to use for patches if the

               checksums didn't match

Apr. 20, 1994  Solution - noted that Sun ensured that the same versions of

               patches were available at all locations and provided files to

               help determine which architectures require the patch.


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