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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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________________________________________________________________________________

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:

    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) 
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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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