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             AUSCERT External Security Bulletin Redistribution

                        ESB-2007.0959 -- [Solaris]
        Race Condition in the Solaris Remote Procedure Calls (RPC)
                    Module May Result in a System Panic
                             30 November 2007

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

Product:              Solaris Remote Procedure Calls
Publisher:            Sun Microsystems
Operating System:     Solaris 10 Operating System
                      Solaris 9 Operating System
                      Solaris 8 Operating System
Impact:               Denial of Service
Access:               Existing Account

Original Bulletin:    
  http://sunsolve.sun.com/search/printfriendly.do?assetkey=1-26-103083-1

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Sun(sm) Alert Notification
     * Sun Alert ID: 103083
     * Synopsis: Race Condition in the Solaris Remote Procedure Calls
       (RPC) Module May Result in a System Panic
     * Category: Security
     * Product: Solaris 9 Operating System, Solaris 10 Operating System,
       Solaris 8 Operating System
     * BugIDs: 4728034
     * Avoidance: Patch
     * State: Resolved
     * Date Released: 28-Nov-2007
     * Date Closed: 28-Nov-2007
     * Date Modified: 

1. Impact

   A race condition security vulnerability in the Solaris Remote
   Procedure Call (RPC) Module may allow a local unprivileged user to
   panic the system, resulting in a Denial of Service (DoS) condition.

2. Contributing Factors

   This issue can occur in the following releases:

   SPARC Platform:
     * Solaris 8 without patch 116959-20
     * Solaris 9 without patch 113278-18
     * Solaris 10 without patch 127739-01

   x86 Platform:
     * Solaris 8 without patch 116960-20
     * Solaris 9 without patch 119439-11
     * Solaris 10 without patch 127740-01

   Note: This issue only affects systems which have the 'rpcmod' kernel
   module loaded.

   To determine if the the 'rpcmod' kernel module is loaded, the
   following command can be run:
    $ modinfo -c | grep rpcmod || echo "System not impacted."

3. Symptoms

   Should the described issue occur, the system may panic with a NULL
   pointer dereference and with a message similar to the following:
    panic[cpu0]/thread=2a100717d40: 0x3000619cea0: BAD TRAP: type=31
    rp=2a100716c50 addr=8 mmu_fsr=0 occurred in module "rpcmod" due to
    a NULL pointer dereference. 

4. Relief/Workaround

   For some situations it may be possible to avoid loading rpcmod by not
   running RPC services on the system; however, this will remove RPC
   functionality. If this is not acceptable, please see the Resolution
   section below.

5. Resolution

   This issue is addressed in the following releases:

   SPARC Platform:
     * Solaris 8 with patch 116959-20 or later
     * Solaris 9 with patch 113278-18 or later
     * Solaris 10 with patch 127739-01 or later

   x86 Platform:
     * Solaris 8 with patch 116960-20 or later
     * Solaris 9 with patch 119439-11 or later
     * Solaris 10 with patch 127740-01 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 2000-2006 Sun Microsystems, Inc., 4150 Network Circle, Santa
   Clara, CA 95054 U.S.A. All rights reserved

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