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             AUSCERT External Security Bulletin Redistribution

                              ESB-2009.1105.2
   Race Condition Security Vulnerability in Solaris Auditing Related to
        Extended File Attributes May Allow Local Unprivileged Users
                            to Panic the System
                               30 July 2009

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

Product:           Solaris Auditing
Publisher:         Sun Microsystems
Operating System:  Solaris
                   OpenSolaris
Impact/Access:     Denial of Service -- Existing Account
Resolution:        Patch
CVE Names:         CVE-2009-2644  

Original Bulletin: 
   http://sunsolve.sun.com/search/document.do?assetkey=1-66-264429-1

Revision History:  July 30 2009: Added CVE
                   July 29 2009: Initial Release

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Solution Type Sun Alert

Solution  264429 :   Race Condition Security Vulnerability in Solaris Auditing 
Related to Extended File Attributes May Allow Local Unprivileged Users to Panic 
the System  

Bug ID
6816071

Product
Solaris 9
Solaris 10
OpenSolaris

Date of Resolved Release
27-Jul-2009

SA Document Body

Race Condition Security Vulnerability in Solaris Auditing  ... (see below)

1. Impact

A race condition security vulnerability in Solaris Auditing when interacting 
with extended file attributes (fsattr(5)) may allow a local unprivileged user to 
be able to panic the system. The ability to panic a system is a type of Denial 
of Service (DoS).

2. Contributing Factors

This issue can occur in the following releases:

SPARC Platform

    * Solaris 9 without patch 122300-42
    * Solaris 10 without patch 140921-02
    * OpenSolaris based upon builds snv_01 through snv_120

x86 Platform

    * Solaris 9 without patch 122301-42
    * Solaris 10 without patch 140922-02
    * OpenSolaris based upon builds snv_01 through snv_120

Notes:

   1. Solaris 8 is not impacted by this issue.

   2. This issue only affects systems which have Solaris Auditing 
   (see bsmconv(1M)) enabled. To determine if a system has Solaris Auditing 
   enabled the grep(1) command can be used to search the '/etc/system' file for 
   a reference to the c2audit kernel module as in the following example:

            $ grep c2audit /etc/system
            set c2audit:audit_load = 1 

   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

If the system panics due to this issue an error message will be generated
which looks similar to the following:

	BAD TRAP: type=e (#pf Page fault) rp=e9762bb0 addr=0 occurred in module
	"unix" due to a NULL pointer dereference

and the stack backtrace will reference audit_savepath() after an earlier call to 
one of the extended attribute (fsattr(5)) functions like openat(2) in the 
following example:

   	die()
 	trap()
 	audit_pathbuild()
 	audit_savepath()
  	lookuppnvp()
  	[...]
  	openat()

4. Workaround

To prevent this issue from occurring Solaris Auditing can be disabled 
(see bsmunconv(1M)).

5. Resolution

This issue is addressed in the following releases:

SPARC Platform

    * Solaris 9 with patch 122300-42 or later
    * Solaris 10 with patch 140921-02 or later
    * OpenSolaris based upon builds snv_121 or later

x86 Platform

    * Solaris 9 with patch 122301-42 or later
    * Solaris 10 with patch 140922-02 or later
    * OpenSolaris based upon builds snv_121 or later

For more information on Security Sun Alerts, see Technical Instruction ID 
213557 
http://sunsolve.sun.com/search/document.do?assetkey=1-61-213557-1

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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