AUSCERT External Security Bulletin Redistribution

                 ESB-97.122 -- Sun Security Bulletin #00154
                          Vulnerabilities in libX11
                             17 September 1997


Sun Microsystems, Inc. has released the following bulletin concerning a
a number of buffer overrun vulnerabilities in libX11, 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

The patches listed in this bulletin address new vulnerabilities not listed
in Sun Security Bulletin #00153 (AUSCERT ESB-97.110).

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).

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 		   Sun Microsystems, Inc. Security Bulletin
Bulletin Number:	#00154
Date: 			September 17, 1997
Title:			libX11
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 libX11.

    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

    libX11 is a library in the X Windows system. There are several buffers
    in libX11 that may be overflowed. The buffer overflow vulnerabilities may 
    be exploited through setuid and setgid programs that link libX11 to 
    increase privileges, including root privileges.
4.  List of Patches

    The vulnerabilities in libX11 are fixed by the following patches:

    OS version          Patch ID
    __________		________
    SunOS 5.5.1		103566-21		
    SunOS 5.5.1_x86	104241-03	
    SunOS 5.5		103210-21	
    SunOS 5.5_x86	104242-02	
    SunOS 5.4		102057-41	
    SunOS 5.4_x86	103185-02	
    SunOS 5.3		101362-51
    SunOS 4.1.4		100899-03
    SunOS 4.1.3_U1	100899-03	

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 4.1.x: /usr/5bin/sum; 
    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
_______________   _________   __________   ________________________________
103566-21.tar.Z   58014 3555  65069 7109   9957BF7423D147E9CFAF877DF637A603
104241-03.tar.Z   11512 1450  52051 2899   C33B8EFD96A7BD22E07582E3C575669D
103210-21.tar.Z   13372 3651  11073 7301   619130609DBE46F7FFECAE89631E3A52
104242-02.tar.Z   55147 1415  30132 2830   83988AADB844139C744D3B81D4B2774F
102057-41.tar.Z   55014 2668  32935 5335   FDE4A6372ACA7CFD62F22DE4F424DEB2
103185-02.tar.Z   59698 1010  62623 2019   23B70F3AEBD6F0462053042FFC29E806
101362-51.tar.Z   26563 6475  50012 12949  B1F06E68F57745CC27328CFB88273349
100899-03.tar.Z   58461 417   51033 833    08C7D7AFFDE39C809F540BD907AA660B
Sun acknowledges with thanks Marko Laakso (University of Oulu, Finland)
for his assistance in the preparation of this bulletin.

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 
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