AUSCERT External Security Bulletin Redistribution

                     ESB-97.110 -- Sun Security Bulletin #00153
			   Vulnerabilities in libXt
                               26 August 1997


Sun Microsystems, Inc. has released the following bulletin concerning a
a number of buffer overrun vulnerabilities in libXt, a library for the
X windows system.  These buffer overrun may be exploited, via a number of
setuid and setgid programs that use this library, to gain privileged

This problem was previously discussed in the CERT/CC Advisory CA-97.11,
re-released by AUSCERT as ESB-97.054, although patch information for Sun
systems was not available at this time..

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 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:


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.

- --------------------------BEGIN INCLUDED TEXT--------------------


 		   Sun Microsystems, Inc. Security Bulletin
Bulletin Number:	#00153
Date: 			August 25, 1997
Cross-Ref:		CERT CA-97.11
Title:			Vulnerabilities in libXt
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, 2.4, 2.3,   
    (SunOS 5.5.1, 5.5, 5.4, 5.3), SunOS 4.1.4, and 4.1.3_U1, which relate 
    to vulnerabilities in libXt.

    Sun strongly recommends that you install the patches listed in section 4 
    immediately on systems running SunOS 5.5.1, 5.5, 5.4, 5.3, 4.1.4, and
    4.1.3_U1. 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, 5.3, 4.1.4, and 4.1.3_U1
    The vulnerabilities are fixed in Solaris 2.6.

3.  Understanding the Vulnerabilities

    libXt is a library in the X Windows system. There are several buffers
    in libXt that may be overflowed. The buffer overflow vulnerabilities may 
    be exploited through setuid and setgid programs that link libXt to 
    increase privileges, including root privileges.
4.  List of Patches

    The vulnerabilities in libXt are fixed by the following patches:

    OS version          Patch ID
    __________		________
    SunOS 5.5.1		104338-02		
    SunOS 5.5.1_x86	105105-01	
    SunOS 5.5		104337-02	
    SunOS 5.5_x86	105104-01	
    SunOS 5.4		105075-01	
    SunOS 5.4_x86	105103-01	
    SunOS 5.3		101429-04
    SunOS 4.1.4		100512-05
    SunOS 4.1.3_U1	100512-05	

5.  Checksum Table

    The checksum table below shows the BSD checksums (SunOS 4.1.x: /bin/sum; 
    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
_______________   _________   __________   ________________________________
104338-02.tar.Z   19861 746   5636 1492    5C41779D358B7C3E96A6AFBAD69E26BB
105105-01.tar.Z   60209 652   30450 1303   859659A92DE3CB4FC476F41E30442695
104337-02.tar.Z   07260 740   64023 1480   2F9E1064C17AD040EC45255DFF8DEFE5
105104-01.tar.Z   11186 802   44802 1603   580F3B9FF748E0913322CB431893815C
105075-01.tar.Z   51275 709   63521 1417   8B6A52B62D9092C7061A80AA33BDB4AA
105103-01.tar.Z   20278 619   48559 1238   E1A592FFACAFD2B3A79B2A7C525B24A2
101429-04.tar.Z   35975 991   3045 1981    1EA911E52281DD23856316F49825EABA
100512-05.tar.Z   58168 468   3889 936     9189EFFE254BF48BF68B7C381BB78615

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 

D.  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:

E.  To receive information or subscribe to our CWS (Customer Warning System) 
    mailing list, send email to:
    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.

Version: 2.6.2


- --------------------------END INCLUDED TEXT--------------------

Version: 2.6.3i
Charset: noconv
Comment: ftp://ftp.auscert.org.au/pub/auscert/AUSCERT_PGP.key