Operating System:

[Solaris]

Published:

01 September 2008

Protect yourself against future threats.

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             AUSCERT External Security Bulletin Redistribution

                        ESB-2008.0825 -- [Solaris]
  A Security Vulnerability in the Solaris NFS Kernel Module May Lead to a
           System Panic, Resulting in a Denial of Service (DoS)
                             1 September 2008

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

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

Product:              Solaris NFS kernel module
Publisher:            Sun Microsystems
Operating System:     Solaris
Impact:               Denial of Service
Access:               Existing Account
CVE Names:            CVE-2008-3839

Original Bulletin:    
  http://sunsolve.sun.com/search/printfriendly.do?assetkey=1-66-241066-1

Revision History:     September 1 2008: Added CVE Reference
                        August 25 2008: Initial Release

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   Solution Type: Sun Alert
   Solution  241066 :   A Security Vulnerability in the Solaris NFS
   Kernel Module May Lead to a System Panic, Resulting in a Denial of
   Service (DoS)          
   Bug ID: 6614416

   Product
   Solaris 10 Operating System
   OpenSolaris

   Date of Resolved Release: 22-Aug-2008

   SA Document Body
   A Security Vulnerability in the Solaris NFS Kernel Module:

   1. Impact
   A security vulnerability in the Solaris NFS kernel module on Solaris
   10 systems with kernel patches 120011-14 (SPARC) and 120012-14
   (x86), may allow a local unprivileged user to cause an NFS server to
   panic, resulting in a Denial of Service (DoS).
   2. Contributing Factors
   This issue can occur in the following releases:
   SPARC Platform
     * Solaris 10 with patch 120011-14 and without patch 138070-02
     * OpenSolaris based upon builds snv_59 through snv_87

   x86 Platform
     * Solaris 10 with patch 120012-14 and without patch 138071-02
     * OpenSolaris based upon builds  snv_59 through snv_87

   Note 1: Solaris 8 and Solaris 9 are not impacted by this issue.
   Note 2: OpenSolaris distributions may include additional bug fixes
   above and beyond the build from which it was derived. To determine the
   base build of  OpenSolaris, the following command can be used:
    $ uname -v
    snv_86

   To determine if a system has a Package Repository Update (PRU)
   installed that addresses this issue, execute the following command:
    $ pkg contents -o name,value -t set | grep 6614416
    com.sun.service.incorporated_changes 6614416

   3. Symptoms
   If the described issue occurs, the NFS server system may panic with a
   stack trace similar to the following:
    > $C
    db66a878 cdev_ioctl+0x16(1a000a0, 422, 0, 80100000, dc78e338, db66a960)
    db66a964 spec_fsync+0xd5(dc949d80, 10000, dc78e338)
    db66a988 fop_fsync+0x1b(dc949d80, 10000, dc78e338)
    db66aac8 rfs3_mknod+0x26d(db66aaf0, db66abc8, dc93f380, db66ad9c, 
    dc78e338)
    db66ad24 common_dispatch+0x3f9()
    db66ad44 rfs_dispatch+0x1c(db66ad9c, cd690740)
    db66add0 svc_getreq+0x158(cd690740, cd7d2340)
    db66adf8 svc_run+0x125(db8312c0)
    db66ae0c svc_do_run+0x6b(1)
    db66af84 nfssys+0x4cf()db66afac sys_sysenter+0x101()

   4. Workaround
   To work around the described  issue, share the NFS file system with
   "-o nodevices" option.
   5. Resolution
   This issue is addressed in the following releases:
   SPARC Platform
     * Solaris 10 with patch 138070-02 or later
     * OpenSolaris based upon builds snv_88 or later

   x86 Platform
     * Solaris 10 with patch 138071-02 or later
     * OpenSolaris based upon builds snv_88 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 2000-2008 Sun Microsystems, Inc., 4150 Network Circle, Santa
   Clara, CA 95054 U.S.A. All rights reserved

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