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             AUSCERT External Security Bulletin Redistribution

               ESB-2004.0678 -- Sun Alert Notification 57664
  Security Vulnerability in Samba May Allow Unauthorized Root Privileges
                              27 October 2004

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

Product:                Samba
Publisher:              Sun Microsystems
Operating System:       Solaris 9
                        UNIX variants
Impact:                 Execute Arbitrary Code/Commands
Access:                 Remote/Unauthenticated
CVE Names:              CAN-2004-0686

Ref:                    ESB-2004.0474
                        ESB-2004.0467

Original Bulletin URL:
  http://sunsolve.sun.com/search/printfriendly.do?assetkey=1-26-57664-1

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   Sun(sm) Alert Notification 
     * Sun Alert ID: 57664
     * Synopsis: Security Vulnerability in Samba May Allow Unauthorized
       Root Privileges
     * Category: Security
     * Product: Solaris
     * BugIDs: 5080288
     * Avoidance: Workaround
     * State: Committed
     * Date Released: 25-Oct-2004
     * Date Closed:
     * Date Modified:

   1. Impact A buffer overflow in Samba may allow a remote unprivileged
   user the ability to execute arbitrary code with the privileges of
   Super User (typically root) on a Solaris 9 system running as a Samba
   server.

   This issue is referenced in the following document:

     * CAN-2004-0686 at:
       [2]http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0686

   2. Contributing Factors This issue can occur in the following
   releases:

   SPARC Platform

     * Solaris 9

   x86 Platform

     * Solaris 9

   Note: Solaris 7 and Solaris 8 do not include the Samba software and
   are not affected by this issue. Sun does include Samba on the Solaris
   Companion CD for Solaris 8 as an unsupported package which installs to
   "/opt/sfw" and is vulnerable to this issue. Sites using the freeware
   version of Samba from the Solaris Companion CD will need to upgrade to
   a later version from Samba.org.

   This issue only occurs if all of the following conditions are true:

     * The system is configured as a Samba server
     * The version of Samba installed is 2.2.0 through 2.2.9 or 3.0.0
       through 3.0.4
     * The server is configured to use the "hash" mangling method. (This
       is the default configuration for Samba 2.2.x only)

   To determine if a system is configured as a Samba server, use the
   following command to check for the presence of the smb.conf(4) file:

    % ls -l /etc/sfw/smb.conf
    -rw-r--r--   1 root     other      11665 Sep 28 16:37 /etc/sfw/smb.conf


   If the output is similar to that shown above, the system is configured
   as a Samba server.

   To determine the version of Samba installed on a system, the following
   command can be run:

    % /usr/sfw/sbin/smbd -V
    Version 2.2.8a

   To determine if the server is configured to use the "hash" mangling
   method, the following command can be run:

    % grep 'mangling method' /etc/sfw/smb.conf

   If the output is either of the following, then the system is
   vulnerable:

    1. "mangling method = hash"
    2. There is no output AND the Samba version is 2.2.x

   Note: For Samba 2.2.x the default is "mangling method = hash". If this
   has not been changed, there will be no entry in the
   "/etc/sfw/smb.conf" file for "mangling method".

   3. Symptoms There are no predictable symptoms that would indicate the
   described issue has been exploited.

   Solution Summary [3]Top

   4. Relief/Workaround Servers which are configured to use the "hash2"
   mangling method are unaffected by this issue. As a result, this issue
   can be avoided by modifying or adding the following "mangling method"
   line to smb.conf(4):

    mangling method = hash2

   5. Resolution A final resolution is pending completion.

   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 2000-2004 Sun Microsystems, Inc., 4150 Network Circle, Santa
   Clara, CA 95054 U.S.A. All rights reserved.

References

   1. http://sunsolve.sun.com/search/printfriendly.do?assetkey=1-26-57664-1#top
   2. http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0686
   3. http://sunsolve.sun.com/search/printfriendly.do?assetkey=1-26-57664-1#top

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