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ESB-2005.0221 -- Sun Alert Notification 57710 -- Security Vulnerability in the newgrp(1) Command May Allow Unauthorized Root Privileges

Date: 18 March 2005

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

               ESB-2005.0221 -- Sun Alert Notification 57710
         Security Vulnerability in the newgrp(1) Command May Allow
                       Unauthorized Root Privileges
                               18 March 2005

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

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

Product:           newgrp
Publisher:         Sun Microsystems
Operating System:  Solaris 
Platform:          SPARC
                   IA-32
Impact:            Root Compromise
Access:            Existing Account

Original Bulletin: http://sunsolve.sun.com/search/printfriendly.do?assetkey=1-26-57710-1

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


   Sun(sm) Alert Notification 
     * Sun Alert ID: 57710
     * Synopsis: Security Vulnerability in the newgrp(1) Command May
       Allow Unauthorized Root Privileges
     * Category: Security
     * Product: Solaris
     * BugIDs: 4705393
     * Avoidance: Workaround, Patch
     * State: Resolved
     * Date Released: 16-Mar-2005
     * Date Closed: 16-Mar-2005
     * Date Modified:

   1. Impact A buffer overflow in newgrp(1) may allow a local
   unprivileged user the ability to gain root privileges.

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

   SPARC Platform

     * Solaris 7 without patch [2]118737-01
     * Solaris 8 without patch [3]116993-01
     * Solaris 9 without patch [4]117445-01

   x86 Platform

     * Solaris 7 without patch [5]118738-01
     * Solaris 8 without patch [6]116994-01
     * Solaris 9 without patch [7]117446-01

   Note: Solaris 10 is not affected by this issue.
addressed
   3. Symptoms There are no predictable symptoms that would indicate the
   described issue has been exploited.

   Solution Summary [8]Top

   4. Relief/Workaround To work around the described issue, sites may
   wish to remove the "setuid" permissions from the newgrp(1) utility
   until patches can be applied to the system. This can be done by
   issuing the following command:

    # chmod u-s /usr/bin/newgrp

   Note: Removing the set-user-ID bit from the newgrp(1) utility will
   prevent unprivileged users from using the newgrp(1) command.

   5. Resolution This issue is addressed in the following releases:

   SPARC Platform

     * Solaris 7 with patch [9]118737-01 or later
     * Solaris 8 with patch [10]116993-01 or later
     * Solaris 9 with patch [11]117445-01 or later

   x86 Platform

     * Solaris 7 with patch [12]118738-01 or later
     * Solaris 8 with patch [13]116994-01 or later
     * Solaris 9 with patch [14]117446-01 or later

   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=1-26-57710-1#top
   2. http://sunsolve.sun.com/search/document.do?assetkey=urn:cds:docid:1-21-118737-01-1
   3. http://sunsolve.sun.com/search/document.do?assetkey=urn:cds:docid:1-21-116993-01-1
   4. http://sunsolve.sun.com/search/document.do?assetkey=urn:cds:docid:1-21-117445-01-1
   5. http://sunsolve.sun.com/search/document.do?assetkey=urn:cds:docid:1-21-118738-01-1
   6. http://sunsolve.sun.com/search/document.do?assetkey=urn:cds:docid:1-21-116994-01-1
   7. http://sunsolve.sun.com/search/document.do?assetkey=urn:cds:docid:1-21-117446-01-1
   8. http://sunsolve.sun.com/search/printfriendly.do?assetkey=1-26-57710-1#top
   9. http://sunsolve.sun.com/search/document.do?assetkey=urn:cds:docid:1-21-118737-01-1
  10. http://sunsolve.sun.com/search/document.do?assetkey=urn:cds:docid:1-21-116993-01-1
  11. http://sunsolve.sun.com/search/document.do?assetkey=urn:cds:docid:1-21-117445-01-1
  12. http://sunsolve.sun.com/search/document.do?assetkey=urn:cds:docid:1-21-118738-01-1
  13. http://sunsolve.sun.com/search/document.do?assetkey=urn:cds:docid:1-21-116994-01-1
  14. http://sunsolve.sun.com/search/document.do?assetkey=urn:cds:docid:1-21-117446-01-1

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NOTE: Third Party Rights
This security bulletin is provided as a service to AusCERT's members.  As
AusCERT did not write the document quoted above, AusCERT has had no control
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organisation, and should be considered in accordance with your organisation's
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which may arise from following or acting on information or advice contained in
this security bulletin.

NOTE: This is only the original release of the security bulletin.  It may
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from the author's website to ensure that the information is still current.

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If you believe that your computer system has been compromised or attacked in 
any way, we encourage you to let us know by completing the secure National IT 
Incident Reporting Form at:

        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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