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             AUSCERT External Security Bulletin Redistribution

                        ESB-2007.0420 -- [Solaris]
        A Security Vulnerability in Solaris 10 NFS XDR Handling May
                 Allow a Denial of Service to NFS Servers
                               15 June 2007

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

Product:              NFS
Publisher:            Sun Microsystems
Operating System:     Solaris 10
Impact:               Denial of Service
Access:               Remote/Unauthenticated
CVE Names:            CVE-2007-3223

Original Bulletin:  
  http://sunsolve.sun.com/search/printfriendly.do?assetkey=1-26-102965-1

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Sun(sm) Alert Notification
     * Sun Alert ID: 102965
     * Synopsis: A Security Vulnerability in Solaris 10 NFS XDR Handling
       May Allow a Denial of Service to NFS Servers
     * Category: Security
     * Product: Solaris 10 Operating System
     * BugIDs: 6458704
     * Avoidance: Patch
     * State: Resolved
     * Date Released: 13-Jun-2007
     * Date Closed: 13-Jun-2007
     * Date Modified: 

1. Impact

   A security vulnerability in Solaris 10 related to the handling of
   XDR data within NFS requests may allow a local or remote unprivileged
   user to panic a Solaris system that is configured to run as an NFS
   server, resulting in a Denial of Service (DoS).

   Sun wishes to thank Andrzej Dereszowski for bringing this issue to our
   attention.

2. Contributing Factors

   This issue can occur in the following releases:

   SPARC Platform
     * Solaris 10 without patch 125100-01

   x86 Platform
     * Solaris 10 without patch 125101-01

   Notes:
    1. Solaris 8 and 9 are not impacted by this issue.
    2. This issue will only affect systems configured to run as NFS
       servers.

   To determine if a Solaris 10 system is configured to run as an NFS
   server, the following command can be run:
    $ svcs nfs/server
    STATE      STIME        FMRI
    online     14:30:59     svc:/network/nfs/server:default

   If the above command reports that NFS services are enabled (see
   smf(5)), the system may be vulnerable.

3. Symptoms

   Should the described issue occur, the system may panic with a stack
   trace which ends similar to the following:
    xdrmblk_getint32+0xb4(...)
    xdr_bool+0x70(...)
    ... 

4. Relief/Workaround

   To prevent this issue until patches can be installed, NFS services may
   be disabled on the affected system by running the following command:
    # svcadm disable nfs/server

5. Resolution

   This issue is addressed in the following releases:

   SPARC Platform
     * Solaris 10 with patch 125100-01 or later

   x86 Platform
     * Solaris 10 with patch 125101-01 or later

   Note:

   Revisions prior to -04 of the above listed patches do not list bug
   6458704 in the READMEs, however, this discrepancy is limited to the
   README; installation of these patches will in fact resolve this issue.

   When originally released, the READMEs for patches 124250 and 124251,
   revisions -01 to -03, incorrectly stated that those patches contained
   the fix for bug 6458704. Even if one of those two patches are
   installed on a system, either patch 125100-01 or 125101-01 (or
   later revisions) must be installed to resolve this issue (and patches
   124250-01 and 124251-01 are not required to resolve this issue).

   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 2000-2006 Sun Microsystems, Inc., 4150 Network Circle, Santa
   Clara, CA 95054 U.S.A. All rights reserved

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