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             __________________________________________________________

                       The U.S. Department of Energy
                    Computer Incident Advisory Capability
                           ___  __ __    _     ___
                          /       |     /_\   /
                          \___  __|__  /   \  \___
             __________________________________________________________

                             INFORMATION BULLETIN

              SunOS, Solaris libX11 Buffer Overflow Vulnerability

September 17, 1997 22:00 GMT                                      Number H-108
______________________________________________________________________________
PROBLEM:       A vulnerability exists in libX11, a library in the X Windows
               system.
PLATFORM:      Solaris 2.5.1, 2.5, 2.4, and 2.3 (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)
DAMAGE:        The buffer overflow vulnerabilities may be exploited through
               setuid and setgid programs that link libX11 to increase
               privileges, including root privileges.
SOLUTION:      Apply patches as listed in Section 4.
______________________________________________________________________________
VULNERABILITY  Sun strongly recommends that you install the patches listed in
ASSESSMENT:    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.
______________________________________________________________________________

[  Start Sun Microsystems Advisory  ]

______________________________________________________________________________
                   Sun Microsystems, Inc. Security Bulletin
               
Bulletin Number:        #00154
Date:                   September 17, 1997
Cross-Ref:             
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:
    
        <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
_______________   _________   __________   ________________________________
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.
______________________________________________________________________________
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.  Sun Security Coordination Team's PGP key is available via World Wide Web
    at:

        <URL:http://sunsolve1.sun.com/sunsolve/secbulletins/SunSCkey.txt>
                                   
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:
        
                security-alert@sun.com

E.  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.
______________________________________________________________________________

[  End Sun Microsystems Advisory  ]

______________________________________________________________________________

CIAC wishes to acknowledge the contributions of Sun Microsystems, Inc for the
information contained in this bulletin.
______________________________________________________________________________


CIAC, the Computer Incident Advisory Capability, is the computer
security incident response team for the U.S. Department of Energy
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LAST 10 CIAC BULLETINS ISSUED (Previous bulletins available from CIAC)

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H-99: SunOS, Solaris ifconfig ioctls Vulnerability
H-100: SunOS, Solaris libXt Vulnerability
H-101: FreeBSD procfs Vulnerability
H-102: SGI IRIX webdist.cgi, handler and wrap programs Vulnerabilities
H-103: HP-UX X11/Motif Libraries Vulnerability
H-104: HP-UX libXt Vulnerability
H-105: HP-UX vuefile, vuepad, dtfile, & dtpad Vulnerabilities
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H-107: UNIX Buffer Overflow in rdist Vulnerability


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