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                                   CERT-Renater

                        Note d'Information No. 2009/VULN085
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DATE                      : 11/03/2009

HARDWARE PLATFORM(S)      : /

OPERATING SYSTEM(S)       : Solaris 10, OpenSolaris running nfssec.

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http://sunsolve.sun.com/search/printfriendly.do?assetkey=1-66-253588-1
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   Solution Type: Sun Alert
   Solution  253588 :   Security Vulnerability in the Solaris NFS Server
   Security Modes (nfssec(5)) may Lead to Unauthorized Access to Shared
   Resources
   Bug ID: 6359212

   Product
   Solaris 10 Operating System
   OpenSolaris

   Date of Resolved Release: 09-Mar-2009

   SA Document Body
   Security vulnerability in the Solaris NFS server security modes
   (nfssec(5)) may lead to unauthorized access to shared resources:

   1. Impact

   A security vulnerability in the Solaris NFS server may lead to
   unauthorized access to file systems shared via NFS if those resources
   are shared using a combination of "none" (AUTH_NONE) and "sys"
   (AUTH_SYS) (see nfssec(5)) security modes.

   2. Contributing Factors

   This issue can occur in the following releases:
   SPARC Platform
     * Solaris 10 without patch 139462-02
     * OpenSolaris based upon builds snv_01 through snv_110

   x86 Platform
     * Solaris 10 without patch 139463-02
     * OpenSolaris based upon builds snv_01 through snv_110

   Note 1: Solaris 8 and Solaris 9 are not impacted by this issue.
   Note 2: Only NFS servers which export shares with AUTH_NONE used in
   combination with the security mode AUTH_SYS are impacted by this
   issue. To determine if a system is configured to run as an NFS server
   (see smf(5)), the following command  can be used:
    $ svcs nfs/server
    STATE      STIME        FMRI
    online     14:30:59     svc:/network/nfs/server:default

   To determine if a system exports shares that have AUTH_NONE used in
   combination with AUTH_SYS, run the following command on the server
   (see share_nfs(1M)):
    $ share /var/tmp
    sec=sys,rw=authorized-host,sec=none,ro

   If the output of the share(1M) command includes NFS shares with
   "sec=sys" and "sec=none", then the NFS server shares resources with
   AUTH_NONE used in combination with the security mode AUTH_SYS.
   Note 3: 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

   3. Symptoms

   There are no predictable symptoms that would indicate the described
   vulnerability has been exploited to gain unauthorized access to
   exported data.

   4. Workaround

   To avoid this issue until patches can be applied, do not export NFS
   shares on the NFS server using AUTH_NONE and AUTH_SYS in combination.

   5. Resolution

   This issue is addressed in the following releases:
   SPARC Platform
     * Solaris 10 with patch 139462-02 or later
     * OpenSolaris based upon builds snv_111 or later

   x86 Platform
     * Solaris 10 with patch 139463-02 or later
     * OpenSolaris based upon builds snv_111 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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