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ESB-2005.0250 -- Sun Alert Notification 57755 -- Buffer Overflow in telnet(1) Client Software

Date: 30 March 2005
References: ESB-2005.0244  

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===========================================================================
             AUSCERT External Security Bulletin Redistribution

               ESB-2005.0250 -- Sun Alert Notification 57755
               Buffer Overflow in telnet(1) Client Software
                               30 March 2005

===========================================================================

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

Product:           telnet
Publisher:         Sun Microsystems
Operating System:  Solaris
Impact:            Execute Arbitrary Code/Commands
Access:            Remote/Unauthenticated
CVE Names:         CAN-2005-0469

Ref:               ESB-2005.0244

Original Bulletin: 
  http://sunsolve.sun.com/search/printfriendly.do?assetkey=1-26-57755-1

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

   Sun(sm) Alert Notification 
     * Sun Alert ID: 57755
     * Synopsis: Buffer Overflow in telnet(1) Client Software
     * Category: Security
     * Product: Solaris
     * BugIDs: 6234932
     * Avoidance: Workaround
     * State: Committed
     * Date Released: 28-Mar-2005
     * Date Closed:
     * Date Modified:

   1. Impact There is a buffer overflow in the unprivileged telnet(1)
   utility. This is not a security vulnerability on its own. However,
   telnet(1) communicates with another host using the TELNET protocol and
   thus there is a small risk of a remote user successfully exploiting
   the overflow.

   If a remote unprivileged user is able to cause a user to execute the
   telnet(1) utility on their client system, then that remote user may be
   able to execute arbitrary commands on the client system with the
   privileges of the user who executed telnet(1).

   This issue is described in CAN-2005-0469 at
   [2]http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-0469

   Sun acknowledges with thanks, iDEFENSE ([3]http://www.idefense.com),
   for bringing this issue to our attention. This issue is also
   referenced in the following iDEFENSE documents:

   IDEF0866 - Multiple Telnet Client slc_add_reply() Buffer Overflow

   IDEF0867 - Multiple Telnet Client env_opt_add() Buffer Overflow

   which can be found at:
   [4]http://www.idefense.com/application/poi/display?type=vulnerabilitie
   s (3.28.05)

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

   SPARC Platform

     * Solaris 7
     * Solaris 8
     * Solaris 9
     * Solaris 10

   x86 Platform

     * Solaris 7
     * Solaris 8
     * Solaris 9
     * Solaris 10

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

   Solution Summary [5]Top

   4. Relief/Workaround To work around the described issue until patches
   are available, sites may consider removing the execute permissions
   from the Solaris telnet(1) utility. To accomplish this, the following
   command can be run (as "root"):

    # chmod 000 /usr/bin/telnet


   To restore the original permissions to the telnet(1) utility (after
   the patches have been applied) the following command can be run (as
   "root"):

    # chmod 555 /usr/bin/telnet


   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 2000-2005 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=1-26-57755-1#top
   2. http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-0469
   3. http://www.idefense.com/
   4. http://www.idefense.com/application/poi/display?type=vulnerabilities
   5. http://sunsolve.sun.com/search/printfriendly.do?assetkey=1-26-57755-1#top

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

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        http://www.auscert.org.au/render.html?it=3192

===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072

Internet Email: auscert@auscert.org.au
Facsimile:      (07) 3365 7031
Telephone:      (07) 3365 4417 (International: +61 7 3365 4417)
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                which are GMT+10:00 (AEST).
                On call after hours for member emergencies only.
===========================================================================

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