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CERT* Vendor-Initiated Bulletin VB-97.15
December 2, 1997

Topic:  Vulnerability in nis_cachemgr
Source: Sun Microsystems, Inc.

To aid in the wide distribution of essential security information, the
CERT Coordination Center is forwarding the following information from
Sun Microsystems, Inc. Sun urges you to act on this information as soon as
possible. Sun contact information is included in the forwarded
text below; please contact them if you have any questions or need
further information.

Please note that since the original publication of this information by
Sun Microsystems, some of the patches have been updated. Patch number
101973 has been updated to revision 33 (101973-33), and patch
number 101974  has been updated to revision 33 (101974-33). MD5
checksums are shown below:

  Filename      MD5
  --------------      -------------------
  101973-33.tar.Z      e10592771e9c8c8673277aa2d4637326
  101974-33.tar.Z      1ad5395c8dec847f646337ebf087f2c0

These patches are also available at

  <URL:ftp://sunsolve1.sun.com/pub/patches/patches.html>



=======================FORWARDED TEXT STARTS HERE============================

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________________________________________________________________________________
        Sun Microsystems, Inc. Security Bulletin
     
Bulletin Number:  #00155
Date:       October 28, 1997
Cross-Ref:    
Title:      nis_cachemgr
________________________________________________________________________________
Permission is granted for the redistribution of this Bulletin, so long as
the Bulletin is not edited and is attributed to Sun Microsystems. Portions
may also be excerpted for re-use in other security advisories so long as
proper attribution is included.

Any other use of this information without the express written consent of
Sun Microsystems is prohibited. Sun Microsystems expressly disclaims all
liability for any misuse of this information by any third party.
________________________________________________________________________________

1.  Bulletins Topics

    Sun announces the release of patches for Solaris 2.5.1, 2.5, and 2.4
    (SunOS 5.5.1, 5.5, and 5.4) which relate to a vulnerability in
    nis_cachemgr.

    Sun estimates that the release of a patch for Solaris 2.3 (SunOS 5.3)
    that relate to the same vulnerability will be available within 4 weeks
    of the date of this bulletin.

    Sun strongly recommends that you install the patches listed in section 4
    immediately on systems running SunOS 5.5.1, 5.5, and 5.4 which use
    NIS+.

2.  Who is Affected
  
    Vulnerable:  SunOS versions 5.5.1, 5.5.1_x86, 5.5, 5.5_x86,
                                5.4, 5.4_x86, 5.3

    Not vulnerable: All other supported versions of SunOS.
                                         
    The vulnerability does not exist in Solaris 2.6.

3.  Understanding the Vulnerability

    NIS+ clients run nis_cachemgr, a NIS+ utility that caches location
    information about NIS+ servers. This vulnerability, if exploited, allows
    attackers to add bogus directory objects to the global shared cache, in
    effect specifying rogue NIS+ servers that are under their control.

4.  List of Patches

    The vulnerability in nis_cachemgr is fixed by the following patches:

    OS version          Patch ID
    __________    ________
    SunOS 5.5.1    103612-33    
    SunOS 5.5.1_x86  103613-32  
    SunOS 5.5    103187-29  
    SunOS 5.5_x86  103188-29  
    SunOS 5.4    101973-32  
    SunOS 5.4_x86  101974-32  
    SunOS 5.3    101318-89  (to be released in 4 weeks)

5.  Checksum Table

    The checksum table below shows the BSD checksums (SunOS 5.x: /usr/ucb/sum),
    SVR4 checksums (SunOS 5.x: /usr/bin/sum), and the MD5 digital signatures
    for the above-mentioned patches that are available from:

       <URL:ftp://sunsolve1.sun.com/pub/patches/patches.html>
       
    These checksums may not apply if you obtain patches from your answer
    centers.

File Name    BSD         SVR4       MD5
_______________   __________   __________    ________________________________
103612-33.tar.Z   42409 3248   60555 6495    63408A137DBE6BEEDAECFA49674F0E5A
103613-32.tar.Z   08972 2939   41390 5878    E613588ADA2845DA2CEDE801FE247ED2
103187-29.tar.Z   47938 3240   14585 6479    D681C0BB1C4267418AEB20F56DDE7FD3
103188-29.tar.Z   36871 2919   14150 5838    F7184B433BF9EDCBA99E81D2039F355A
101973-32.tar.Z   55144 956    44485 1911    A802DA901090B52A27BDC6AE0D386C13
101974-32.tar.Z   41770 826    48991 1652    91AB26639B6CB0902ADE354999751826
______________________________________________________________________________
APPENDICES

A.  Patches listed in this bulletin are available to all Sun customers via
    World Wide Web at:

      <URL:ftp://sunsolve1.sun.com/pub/patches/patches.html>
      
    Customers with Sun support contracts can also obtain patches from local
    Sun answer centers and SunSITEs worldwide.

B.  Sun security bulletins are available via World Wide Web at:

  <URL:http://sunsolve1.sun.com/sunsolve/secbulletins>
  
C.  Sun Security Coordination Team's PGP key is available via World Wide Web
    at:

  <URL:http://sunsolve1.sun.com/sunsolve/secbulletins/SunSCkey.txt>
                
D.  To report or inquire about a security problem with Sun software, contact
    one or more of the following:

        - Your local Sun answer centers
        - Your representative computer security response team, such as CERT
        - Sun Security Coordination Team. Send email to:
  
         security-alert@sun.com

E.  To receive information or subscribe to our CWS (Customer Warning System)
    mailing list, send email to:

        security-alert@sun.com

    with a subject line (not body) containing one of the following commands:

        Command         Information Returned/Action Taken
        _______         _________________________________

        help            An explanation of how to get information

        key             Sun Security Coordination Team's PGP key
  
        list            A list of current security topics

        query [topic]   The email is treated as an inquiry and is forwarded to
                        the Security Coordination Team

        report [topic]  The email is treated as a security report and is
                        forwarded to the Security Coordinaton Team. Please
                        encrypt sensitive mail using Sun Security Coordination
                        Team's PGP key

        send topic      A short status summary or bulletin. For example, to
                        retrieve a Security Bulletin #00138, supply the
                        following in the subject line (not body):
            
                                send #138

        subscribe       Sender is added to our mailing list.  To subscribe,
                        supply the following in the subject line (not body):

                              subscribe cws your-email-address
      
                        Note that your-email-address should be substituted
                        by your email address.
      
        unsubscribe     Sender is removed from the CWS mailing list.
________________________________________________________________________________



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========================FORWARDED TEXT ENDS HERE=============================

If you believe that your system has been compromised, contact the CERT
Coordination Center or your representative in the Forum of Incident Response
and Security Teams (FIRST). See http://www.first.org/team-info/.

We strongly urge you to encrypt any sensitive information you send by email.
The CERT Coordination Center can support a shared DES key and PGP. Contact
the CERT staff for more information.

Location of CERT PGP key
         ftp://ftp.cert.org/pub/CERT_PGP.key


CERT Contact Information
- ------------------------
Email    cert@cert.org

Phone    +1 412-268-7090 (24-hour hotline)
                CERT personnel answer 8:30-5:00 p.m. EST
                (GMT-5)/EDT(GMT-4), and are on call for
                emergencies during other hours.

Fax      +1 412-268-6989

Postal address
        CERT Coordination Center
        Software Engineering Institute
        Carnegie Mellon University
        Pittsburgh PA 15213-3890
        USA

CERT publications, information about FIRST representatives, and other
security-related information are available from
        http://www.cert.org/
        ftp://ftp.cert.org/pub/

CERT advisories and bulletins are also posted on the USENET newsgroup
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To be added to our mailing list for CERT advisories and bulletins, send your
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In the subject line, type
        SUBSCRIBE  your-email-address



* Registered U.S. Patent and Trademark Office.

The CERT Coordination Center is part of the Software Engineering
Institute (SEI). The SEI is sponsored by the U. S. Department of Defense.


This file: ftp://ftp.cert.org/pub/cert_bulletins/VB-97.15.nis_cachemgr



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