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
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 		   Sun Microsystems, Inc. Security Bulletin
Bulletin Number:	#00146
Date: 			July 15, 1997
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:
    These checksums may not apply if you obtain patches from your answer

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.

A.  Patches listed in this bulletin are available to all Sun customers via 
    World Wide Web at:
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