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________________________________________________________________________________
                   Sun Microsystems, Inc. Security Bulletin

Bulletin Number:        #00203
Date:                   June 21, 2001
Cross-Ref:              AUSCERT AA-2001.03
Title:                  ypbind
________________________________________________________________________________

The information contained in this Security Bulletin is provided "AS IS."
Sun makes no warranties of any kind whatsoever with respect to the information
contained in this Security Bulletin. ALL EXPRESS OR IMPLIED CONDITIONS,
REPRESENTATIONS AND WARRANTIES, INCLUDING ANY WARRANTY OF NON-INFRINGEMENT OR
IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, ARE
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If any of the above provisions are held to be in violation of applicable law,
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________________________________________________________________________________

1.  Bulletins Topics

    Sun announces the release of patches for Solaris(tm) 8, 7, 2.6,
    2.5.1, 2.5, and 2.4 (SunOS(tm) 5.8, 5.7, 5.6, 5.5.1, 5.5, and
    5.4) which relate to a buffer overflow vulnerability in ypbind.

    Sun recommends that you install the patches listed in section 4
    immediately on systems running SunOS 5.8, 5.7, 5.6, 5.5.1, 5.5,
    and 5.4

2.  Who is Affected
        
        Vulnerable:             SunOS 5.8, 5.8_x86, 5.7, 5.7_x86, 5.6,
                                5.6_x86, 5.5.1, 5.5.1_x86, 5.5, 5.5_x86,
                                5.4, and 5.4_x86
        Not vulnerable:         SunOS 5.8 01/01* and SunOS 5.8_x86 01/01*
                                and all later SunOS 5.8 update releases.
                                SunOS 5.8 and SunOS 5.8_x86 with
                                Maintenance Update (MU) 3* or a later MU
                                applied.

* To determine if one is running SunOS 5.8 01/01 or later or SunOS 5.8
Maintenance Update 3 or later, check the contents of the /etc/release file.

3.  Understanding the Vulnerability

    The ypbind daemon runs on all client and server machines that are set
    up to use NIS.  A buffer overflow vulnerability has been discovered in
    ypbind which may be exploited by a local or a remote attacker to gain
    root access.

4.  List of Patches

    The following patches are available in relation to the above problems.

    OS Version          Patch ID
    __________          _________
    SunOS 5.8           110322-01
    SunOS 5.8_x86       110323-01
    SunOS 5.7           108750-02
    SunOS 5.7_x86       108751-02
    SunOS 5.6           105403-04
    SunOS 5.6_x86       105404-04
    SunOS 5.5.1         105165-04
    SunOS 5.5.1_x86     105166-04
    SunOS 5.5           105169-04
    SunOS 5.5_x86       105170-04
    SunOS 5.4           101973-41
    SunOS 5.4_x86       101974-41
_______________________________________________________________________________

Sun acknowledges with thanks, AusCERT as well as Mark Dowd and Stephen
James of IT Audit & Consulting, for bringing this issue to our attention
and their assistance in the preparation of this bulletin.
_______________________________________________________________________________
APPENDICES

A.  Patches listed in this bulletin are available to all Sun customers at:

    http://sunsolve.sun.com/securitypatch

B.  Checksums for the patches listed in this bulletin are available at:

    ftp://sunsolve.sun.com/pub/patches/CHECKSUMS

C.  Sun security bulletins are available at:

    http://sunsolve.sun.com/security
        
D.  Sun Security Coordination Team's PGP key is available at:

    http://sunsolve.sun.com/pgpkey.txt
                
E.  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

F.  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:

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        unsubscribe     Sender is removed from the CWS mailing list.
________________________________________________________________________________

Copyright 2000 Sun Microsystems, Inc. All rights reserved. Sun,
Sun Microsystems, Solaris and SunOS are trademarks or registered trademarks
of Sun Microsystems, Inc. in the United States and other countries. This
Security Bulletin may be reproduced and distributed, provided that this
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