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________________________________________________________________________________

     Sun Microsystems, Inc. Security Bulletin



Bulletin Number: #00200

Date: January 12, 2001

Cross-Ref: Bugtraq ID 2193

Title: arp

________________________________________________________________________________



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,

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IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, ARE

HEREBY DISCLAIMED AND EXCLUDED TO THE EXTENT ALLOWED BY APPLICABLE LAW.



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OR PUNITIVE DAMAGES HOWEVER CAUSED AND REGARDLESS OF ANY THEORY OF LIABILITY

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If any of the above provisions are held to be in violation of applicable law,

void, or unenforceable in any jurisdiction, then such provisions are waived

to the extent necessary for this disclaimer to be otherwise enforceable in

such jurisdiction.

________________________________________________________________________________



1.  Bulletins Topics



    Sun announces the release of patches for Solaris(tm) 7, 2.6, 2.5.1,

    2.5, and 2.4 (SunOS(tm) 5.7, 5.6, 5.5.1, 5.5, and 5.4) which relate

    to a setgid vulnerability in arp.



2.  Who is Affected



    Versions of arp in Solaris prior to Solaris 8





    Vulnerable:     Solaris 7, 7_x86, 2.6, 2.6_x86, 2.5.1,

                                2.5.1_x86, 2.5, 2.5_x86, 2.4, 2.4_x86

    Not vulnerable: Solaris 8.



3.  Understanding the Vulnerability



    The arp program displays and modifies the Internet-to-Ethernet address

    translation tables used by the address resolution protocol (arp).  Prior

    to Solaris 8, arp was setgid making it susceptible to certain setgid

    attacks.



    A malicious user could overflow the stack and execute shellcode which

    could allow unauthorized root access.



4.  List of Patches



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



    OS Version Patch ID

    __________ _________

    SunOS 5.7 109709-01

    SunOS 5.7_x86    109710-01

    SunOS 5.6 109719-01

    SunOS 5.6_x86 109720-01

    SunOS 5.5.1 109721-01

    SunOS 5.5.1_x86 109722-01

    SunOS 5.5 109707-01

    SunOS 5.5_x86 109708-01

    SunOS 5.4         109723-01

    SunOS 5.4_x86 109724-01

________________________________________________________________________________

Sun acknowledges, with thanks, Dave Ahmed of Security-Focus.com and Pablo Sor

from the AFIP Computer Security Department for their assistance with this

matter.

http://www.securityfocus.com/bid/2193

________________________________________________________________________________

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:



    http://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)

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    security-alert@sun.com



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



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________________________________________________________________________________



Copyright 2001 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

Security Bulletin is not modified in any way and is attributed to

Sun Microsystems, Inc. and provided that such reproduction and distribution

is performed for non-commercial purposes.



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