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             AUSCERT External Security Bulletin Redistribution

     ESB-2003.0780 -- Sun(sm) Alert Notification - Sun Alert ID: 54042
  Solaris Kerberos 5 Buffer Overflow/Underflow in Principal Name Handling
                             14 November 2003

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:                Kerberos 5
Publisher:              Sun Microsystems
Operating System:       Solaris 9
                        Solaris 8
                        Solaris 7
                        Solaris 2.6
Impact:                 Denial of Service
Access Required:        Remote
CVE Names:              CAN-2003-0082 CAN-2003-0072

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   DOCUMENT ID: 54042
   SYNOPSIS: Kerberos 5 Vulnerability in Principal Name Handling Buffer
   Overflows/Underflows Affecting Solaris and SEAM(5)
   DETAIL DESCRIPTION:
   
Sun(sm) Alert Notification

     * Sun Alert ID: 54042
     * Synopsis: Solaris/SEAM Kerberos 5 Vulnerability due to Buffer
       Overflow/Underflow in Principal Name Handling
     * Category: Security
     * Product: Solaris, Solaris Enterprise Authentication Mechanism
       (SEAM)
     * BugIDs: 4836676
     * Avoidance: Patch
     * State: Resolved
     * Date Released: 28-Apr-2003, 11-Nov-2003
     * Date Closed: 11-Nov-2003
     * Date Modified: 11-Nov-2003
       
1. Impact

   On Kerberos 5 enabled systems, an unprivileged local or remote user
   may be able to kill the Kerberos KDC and admin daemons, for example,
   krb5kdc(1M) and kadmind(1M). Some Kerberos client applications, such
   as kadmin(1M), are also affected by this issue.
   
   This issue is described in MIT krb5 Security Advisory 2003-005 at:
   [1]http://web.mit.edu/kerberos/www/advisories/MITKRB5-SA-2003-005-buf.
   txt.
   
2. Contributing Factors

   This issue can occur in the following releases:
   
   SPARC Platform
     * SEAM 1.0 for Solaris 2.6 without patches 112534-03 and 110057-07
     * SEAM 1.0 for Solaris 7 without patches 112536-04 and 110057-07
     * SEAM 1.0.1 for Solaris 8 without patch 110060-14
     * SEAM 1.0.2 for Solaris 9 without patch 116462-01
     * Solaris 8 without patches 112237-09 and 112390-08
     * Solaris 9 without patches 112925-03, 112923-03, 112921-02, and
       112908-10
       
   x86 Platform
     * SEAM 1.0 for Solaris 2.6 without patches 112535-03 and 110058-07
     * SEAM 1.0 for Solaris 7 without patches 112537-04 and 110058-07
     * SEAM 1.0.1 for Solaris 8 without patches 110061-14 SEAM 1.0.1 for
       Solaris 8
     * Solaris 8 without patches 112238-08 and 112240-07
     * Solaris 9 without patches 116044-01, 116045-01, 116046-03,
       113990-04, and 115168-02
       
   For Solaris without SEAM, this issue may only occur if the system is
   configured with Kerberos. To verify, please issue the following:
    % grep default_realm /etc/krb5/krb5.conf | grep -v ___default_realm___
     default_realm = EXAMPLE.COM

   If nothing is returned or the "krb5.conf" file is not found, then the
   system is not configured for Kerberos.
   
   Note: Solaris Enterprise Authentication Mechanism (SEAM) is an
   unbundled product available for Solaris 2.6, 7, and 8. For more
   information on SEAM, please see the SEAM(5) man page.
   
   Note: SEAM 1.0.2 for the Solaris 9 x86 platform already has the fix
   for this security issue.
   
3. Symptoms

   There are no predictable symptoms that would show that the described
   issue has occurred.
   
   SOLUTION SUMMARY:
   
4. Relief/Workaround

   Until patches can be applied, sites may wish to block access to the
   affected service from untrusted networks such as the Internet or
   disable the daemon where possible. Use a firewall or other
   packet-filtering technology to block the appropriate network ports.
   
   Consult your vendor or your firewall documentation for detailed
   instructions on how to configure the ports.
   
5. Resolution

   This issue is addressed in the following releases:
   
   SPARC Platform
     * SEAM 1.0 for Solaris 2.6 with patches 112534-03 and 110057-07 or
       later
     * SEAM 1.0 for Solaris 7 with patches 112536-04 and 110057-07 or
       later
     * SEAM 1.0.1 for Solaris 8 with patch 110060-14 or later
     * SEAM 1.0.2 for Solaris 9 with patch 116462-01 or later
     * Solaris 8 with patches 112237-09 and 112390-08 or later
     * Solaris 9 with patches 112925-03, 112923-03, 112921-02, and
       112908-10 or later
       
   x86 Platform
     * SEAM 1.0 for Solaris 2.6 with patches 112535-03 and 110058-07 or
       later
     * SEAM 1.0 for Solaris 7 with patches 112537-04 and 110058-07 or
       later
     * SEAM 1.0.1 for Solaris 8 with patch 110061-14 or later
     * Solaris 8 with patches 112238-08 and 112240-07 or later
     * Solaris 9 with patches 116044-01, 116045-01, 116046-03, 113990-04,
       and 115168-02 or later
       
   Note: It is necessary to restart the Kerberos network daemons after
   the patch installation(s) for the fix to take affect.
   
   Execute the following commands as root:
    # /etc/init.d/kdc stop
    # /etc/init.d/kdc start

    # /etc/init.d/kdc.master stop
    # /etc/init.d/kdc.master start

Change History

   11-Nov-2003:
     * Updated Contributing Factors, Relief/Workaround and Resolution
       sections
     * State: Resolved
       
   This Sun Alert notification is being provided to you on an "AS IS"
   basis. This Sun Alert notification may contain information provided by
   third parties. The issues described in this Sun Alert notification may
   or may not impact your system(s). Sun makes no representations,
   warranties, or guarantees as to the information contained herein. ANY
   AND ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION
   WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR
   NON-INFRINGEMENT, ARE HEREBY DISCLAIMED. BY ACCESSING THIS DOCUMENT
   YOU ACKNOWLEDGE THAT SUN SHALL IN NO EVENT BE LIABLE FOR ANY DIRECT,
   INDIRECT, INCIDENTAL, PUNITIVE, OR CONSEQUENTIAL DAMAGES THAT ARISE
   OUT OF YOUR USE OR FAILURE TO USE THE INFORMATION CONTAINED HEREIN.
   This Sun Alert notification contains Sun proprietary and confidential
   information. It is being provided to you pursuant to the provisions of
   your agreement to purchase services from Sun, or, if you do not have
   such an agreement, the Sun.com Terms of Use. This Sun Alert
   notification may only be used for the purposes contemplated by these
   agreements.
   
   Copyright 2000-2003 Sun Microsystems, Inc., 4150 Network Circle, Santa
   Clara, CA 95054 U.S.A. All rights reserved.
   

References

   1. http://web.mit.edu/kerberos/www/advisories/MITKRB5-SA-2003-005-buf.txt



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