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             AUSCERT External Security Bulletin Redistribution

					   
                ESB-97.097 -- Sun Security Bulletin #00148
                          Vulnerability in NIS+
                              31 July 1997

===========================================================================
Sun Microsystems, Inc. has released the following advisory concerning a
vulnerability in the NIS+ package.  This vulnerability may allow
non-privileged users to gain root privileges on the system.

The following security bulletin is provided as a service to AUSCERT's
members.  As AUSCERT did not write this document, AUSCERT has had no
control over its content.  As such, the decision to use any or all of this
information is the responsibility of each user or organisation, and should
be done so in accordance with site policies and procedures.

Contact information for Sun Microsystems, Inc. is included in the Security
Bulletin below.  If you have any questions or need further information,
please contact them directly.

A mirror of the patches mentioned in this advisory are available from:

        ftp://ftp.auscert.org.au/pub/mirrors/sunsolve1.sun.com/

Previous advisories and external security bulletins can be retrieved from:

	http://www.auscert.org.au/information/advisories.html

If you believe that your system has been compromised, contact AUSCERT or
your representative in FIRST (Forum of Incident Response and Security Teams).

Internet Email: auscert@auscert.org.au
Facsimile:      (07) 3365 4477
Telephone:      (07) 3365 4417 (International: +61 7 3365 4417)
	AUSCERT personnel answer during Queensland business
	hours which are GMT+10:00 (AEST).
	On call after hours for emergencies.

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________________________________________________________________________________
 		   Sun Microsystems, Inc. Security Bulletin
 		
Bulletin Number:	#00148
Date: 			July 30 
Title:			Vulnerability in NIS+

________________________________________________________________________________
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 2.4 and 2.3 (SunOS 5.4 
    and 5.3) which relate to a vulnerability in NIS+.

    Sun strongly recommends that you install the patches listed in section 4 
    immediately on systems running SunOS 5.4 and 5.3 which use NIS+.

2.  Who is Affected
	
    Vulnerable:  SunOS versions 5.4, 5.4_x86, and 5.3 which use NIS+.
    
    Not Vulnerable: SunOS 4.1.3_U1, 4.1.4, 5.5, 5.5_x86, 5.5.1, 5.5.1_x86,
                    and the upcoming version of Solaris.
 
3.  Understanding the Vulnerability

    NIS+ is a network-wide name service that runs under Solaris. It can be
    selected as the name service in /etc/nsswitch.conf. If NIS+ is selected,
    programs with setuid root permissions will link nss_nisplus.so.1 which
    is susceptible to a buffer overflow vulnerability. This vulnerability may 
    allow non-privileged users to gain root privileges.

4.  List of Patches

    The vulnerability in NIS+ is fixed by the following patches:

    OS version		Patch ID
    __________		________
    SunOS 5.4		102277-03	
    SunOS 5.4_x86	102278-03	
    SunOS 5.3		101736-04
 		
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
_______________   ________   _________    ________________________________
102277-03.tar.Z   10681 76   2019 152     4585727103680C70301D2F7679C9EA6D
102278-03.tar.Z   52108 76   53872 151    5040EB6980280C729051927BFB5C8130
101736-04.tar.Z   27381 77   18741 153    0AC81583908220A4D92CF5C091D6212C

________________________________________________________________________________
Sun is a member of FIRST, the Forum of Incident Response and Security Teams. 
For more information about FIRST, visit the FIRST web site at 
"http://www.first.org/".
________________________________________________________________________________
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.  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

D.  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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