AUSCERT External Security Bulletin Redistribution

                 ESB-97.134 -- Sun Security Bulletin #00155
                               29 October 1997


Sun Microsystems, Inc. has released the following advisory concerning a
vulnerability in nis_cachemgr.  This vulnerability may allow attackers to
add bogus directory objects to the global shared cache, in effect specifying
rogue NIS+ servers that are under their control.

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 is included in the Security Bulletin below.
If you have any questions or need further information, please contact them

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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:	#00155
Date: 			October 28, 1997
Title:			nis_cachemgr
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, 2.5, and 2.4   
    (SunOS 5.5.1, 5.5, and 5.4) which relate to a vulnerability in 

    Sun estimates that the release of a patch for Solaris 2.3 (SunOS 5.3) 
    that relate to the same vulnerability will be available within 4 weeks 
    of the date of this bulletin.
    Sun strongly recommends that you install the patches listed in section 4 
    immediately on systems running SunOS 5.5.1, 5.5, and 5.4 which use

2.  Who is Affected
    Vulnerable:  SunOS versions 5.5.1, 5.5.1_x86, 5.5, 5.5_x86,
                                5.4, 5.4_x86, 5.3
    Not vulnerable: All other supported versions of SunOS.
    The vulnerability does not exist in Solaris 2.6.
3.  Understanding the Vulnerability

    NIS+ clients run nis_cachemgr, a NIS+ utility that caches location 
    information about NIS+ servers. This vulnerability, if exploited, allows
    attackers to add bogus directory objects to the global shared cache, in 
    effect specifying rogue NIS+ servers that are under their control.

4.  List of Patches

    The vulnerability in nis_cachemgr is fixed by the following patches:

    OS version          Patch ID
    __________		________
    SunOS 5.5.1		103612-33		
    SunOS 5.5.1_x86	103613-32	
    SunOS 5.5		103187-29	
    SunOS 5.5_x86	103188-29	
    SunOS 5.4		101973-32	
    SunOS 5.4_x86	101974-32	
    SunOS 5.3		101318-89	(to be released in 4 weeks)

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:
    These checksums may not apply if you obtain patches from your answer

File Name	  BSD	       SVR4	     MD5
_______________   __________   __________    ________________________________
103612-33.tar.Z   42409 3248   60555 6495    63408A137DBE6BEEDAECFA49674F0E5A
103613-32.tar.Z   08972 2939   41390 5878    E613588ADA2845DA2CEDE801FE247ED2
103187-29.tar.Z   47938 3240   14585 6479    D681C0BB1C4267418AEB20F56DDE7FD3
103188-29.tar.Z   36871 2919   14150 5838    F7184B433BF9EDCBA99E81D2039F355A
101973-32.tar.Z   55144 956    44485 1911    A802DA901090B52A27BDC6AE0D386C13
101974-32.tar.Z   41770 826    48991 1652    91AB26639B6CB0902ADE354999751826

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

C.  Sun Security Coordination Team's PGP key is available via World Wide Web 

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    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:

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