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Security Bulletin 9405                  DISA Defense Communications System
February 14, 1994            Published by: DDN Security Coordination Center
                                      (SCC@NIC.DDN.MIL)   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-9302).
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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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** Please note that this bulletin supersedes DDN SECURITY BULLETIN 9109 and 
   DDN SECURITY BULLETIN 9216

===========================================================================
CA-94:02                        CERT Advisory
                              February 14, 1994
            Revised Patch for SunOS /usr/etc/rpc.mountd Vulnerability

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                    *** THIS IS A REVISED CERT ADVISORY ***
           *** IT CONTAINS NEW VULNERABILITY AND PATCH INFORMATION ***
             *** 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'.
 
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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 filesystem can be mounted by anyone.
      
II.  Impact

     Unauthorized remote hosts will be able to mount the filesystem.
     This will allow unauthorized users read and write access to files
     on mounted filesystem.

III. Solution

     Obtain and install the appropriate patch following the instructions
     included with the patch.

     Patch-ID   Filename         BSD        MD5
                                 Checksum   Checksum
     100296-04  100296-04.tar.Z  42492 40   20a76c75abadd3360ad92091a25ceb3c

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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.

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*                                                                          *
*    The point of contact for MILNET security-related incidents is the     *
*    Security Coordination Center (SCC).                                   *
*                                                                          *
*               E-mail address: SCC@NIC.DDN.MIL                            *
*                                                                          *
*               Telephone: 1-(800)-365-3642                                *
*                                                                          *
*    NIC Help Desk personnel are available from 7:00 a.m.-7:00 p.m. EST,   *
*    Monday through Friday except on federal holidays.                     *
*                                                                          *
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