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            AUSCERT External Security Bulletin Redistribution

                             
               ESB-97.089 -- Sun Security Bulletin #00146
		         Vulnerability in ping
                              16 July 1997

===========================================================================

Sun Microsystems, Inc. has released the following advisory concerning a
vulnerability in the ping program.  This vulnerability may allow local
users to cause the system to panic.

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.

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:	#00146
Date: 			July 15, 1997
Cross-Ref:		
Title:			Vulnerability in ping

________________________________________________________________________________
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 and 2.5 
    (SunOS 5.5.1 and 5.5), which relate to a vulnerability in the
    IP driver via the ping utility.

    Sun estimates that the release of patches for Solaris 2.4 and 2.3
    (SunOS 5.4 and 5.3) which relate to the same vulnerability will be
    available within 8 weeks and 16 weeks respectively of the date
    of this bulletin.

    Sun strongly recommends that you install the patches listed in
    section 5 immediately on systems running SunOS 5.5.1 and 5.5. Sun
    also strongly recommends that you install the workaround listed in
    section 4 immediately on systems running SunOS 5.4 or 5.3. Exploit
    information is publicly available.

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

    Not vulnerable:  All other supported versions of SunOS
     		
    The vulnerability is fixed in the upcoming release of Solaris.

3.  Understanding the Vulnerability

    The ping program uses the ICMP protocol's ECHO_REQUEST datagram to elicit
    an ICMP ECHO_RESPONSE from specified hosts. The vulnerability entails 
    sending a ping request to a multicast address through the loopback 
    interface.  Part of the effect is that the system pings itself. However, 
    the incoming queue pointer is not yet initialized when the packet is 
    received causing the system to panic. The fix, as delivered via the 
    patches mentioned in section 5, is to initialize the queue pointer to 
    the correct queue at the time the packet is received.
    
4.  Workaround

    Sun recommends as a temporary workaround that all systems be protected
    by executing the following command as root:

       /usr/sbin/ndd -set /dev/ip ip_respond_to_echo_broadcast 0

    Adding the above command to the file /etc/init.d/inetinit makes the 
    workaround effective across reboots.

5.  List of Patches

    The vulnerability in ping is fixed by the following patches:

    OS version		Patch ID
    __________		________
    SunOS 5.5.1		103630-09	
    SunOS 5.5.1_x86	103631-09
    SunOS 5.5		103169-12	 
    SunOS 5.5_x86	103170-12	 
    SunOS 5.4		101945-52	(to be released in 8 weeks)
    SunOS 5.4_x86	101946-46	(to be released in 8 weeks)
    SunOS 5.3		101318-89	(to be released in 16 weeks)	

6.  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
_______________   _________   __________   ________________________________
103630-09.tar.Z   48744 656   23098 1311   BF33542DAD2C1455C6B94300E65B7447
103631-09.tar.Z   10984 573   53999 1145   B8CF75F23D243F9A8947A8FA05CC82BE
103169-12.tar.Z   62974 650   32631 1299   651D2F25A65FDA49FCED0C68CBD7EA32
103170-12.tar.Z   54167 568   15267 1135   9C31DCECA19A8AB621A11B13B4F80986

________________________________________________________________________________
Sun acknowledges, with thanks, Mark Henderson for providing the workaround 
referenced in this bulletin.
________________________________________________________________________________
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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