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             AUSCERT External Security Bulletin Redistribution

                        ESB-2008.0892 -- [Solaris]
  Security Vulnerability in the ACL (acl(2)) Implementation for UFS File
            Systems May Allow a Local User to Panic the System
                              22 January 2009

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

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

Product:              acl
Publisher:            Sun Microsystems
Operating System:     Solaris
Impact:               Denial of Service
Access:               Existing Account
CVE Names:            CVE-2008-4160

Original Bulletin:    
  http://sunsolve.sun.com/search/printfriendly.do?assetkey=1-66-242267-1

Revision History:       January 22 2009: Added patches for Solaris 8
                        January 16 2009: Added patches for Solaris 9 and 10
                        October 16 2008: Updated Resolution
                      September 29 2008: Added CVE information
                      September 22 2008: Initial Release

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   Solution Type: Sun Alert

   Solution  242267 :   Security Vulnerability in the ACL (acl(2))
   Implementation for UFS File Systems May Allow a Local User to Panic
   the System 
         
   Bug ID: 6748275

   Product
   Solaris 8 Operating System
   Solaris 9 Operating System
   Solaris 10 Operating System
   OpenSolaris

   Date of Preliminary Release: 18-Sep-2008

   Date of Workaround Release: 15-Jan-2009

   Date of Resolved Release: 21-Jan-2009

   SA Document Body

   Security Vulnerability in the ACL (acl(2)) Implementation for UFS File 
   Systems May Allow a Local User to Panic the System

   1. Impact

   A security vulnerability in the Solaris Access Control List (ACL) (see
   acl(2)) implementation for UFS file systems may allow a local
   unprivileged user to panic a system which has a UFS filesystem. This
   is a type of Denial of Service (DoS).

   Sun would like to acknowledge with thanks, Nils Goroll, for bringing
   this issue to our attention and aiding us in the development of a fix
   through the OpenSolaris project.

   2. Contributing Factors

   This issue can occur in the following releases:
   SPARC Platform
     * Solaris 8 without patch 117350-60
     * Solaris 9 without patch 122300-34
     * Solaris 10 without patch 139483-01
     * OpenSolaris based upon builds snv_01 through snv_99

   x86 Platform
     * Solaris 8 without patch 117351-60
     * Solaris 9 without patch 122301-34
     * Solaris 10 without patch 139484-01
     * OpenSolaris based upon builds snv_01 through snv_99

   Note: This issue only affects systems which have UFS file systems
   mounted which are writable (read-write). To print the list of UFS file
   systems mounted read-write on the system, the following command can be
   run:

   $ mount -p | grep ufs | grep rw

   3. Symptoms

   If this issue is experienced, the system will panic with a message
   similar to the following:

   panic[cpu0]/thread=300043e8060: BAD TRAP: type=31 rp=2a10165f130 addr=70 mmu_fs
   r=0
   occurred in module "ufs" due to a NULL pointer dereference
   unix:die+78 (...)
   unix:trap+9e0 (...)
   unix:ktl0+48 (...)
   ufs:ufs_acl_access+4 (...)
   ufs:ufs_dirlook+48 (...)
   ufs:ufs_lookup+2ac (...)
   genunix:fop_lookup+28 (...)
   genunix:lookuppnvp+344 (...)
   genunix:lookuppnat+120 (...)
   genunix:lookupnameat+5c (...)
   genunix:cstatat_getvp+198 (...)
   genunix:cstatat64_32+40 (...)

   Note that either ufs_acl_access() or ufs_iaccess() are the top most
   UFS functions in the call stack.

   4. Workaround

   There is no workaround for this issue. Please see the Resolution
   section below.

   5. Resolution

   This issue is addressed in the following releases:
   SPARC Platform
     * Solaris 8 with patch 117350-60 or later
     * Solaris 9 with patch 122300-34 or later
     * Solaris 10 with patch 139483-01 or later
     * OpenSolaris based upon builds snv_100 or later

   x86 Platform
     * Solaris 8 with patch 117351-60 or later
     * Solaris 9 with patch 122301-34 or later
     * Solaris 10 with patch 139484-01 or later
     * OpenSolaris based upon builds snv_100 or later

   For more information on Security Sun Alerts, see Technical
   Instruction ID 213557.

   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 2000-2009 Sun Microsystems, Inc., 4150 Network Circle, Santa
   Clara, CA 95054 U.S.A. All rights reserved

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