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             AUSCERT External Security Bulletin Redistribution

                              ESB-2009.1094.2
    Security Vulnerability in Solaris Auditing Related to Extended File
     Attributes May Allow Local Unprivileged Users to Panic the System
                               28 July 2009

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

Product:           Solaris 9
                   Solaris 10
                   OpenSolaris
Publisher:         Sun Microsystems
Operating System:  Solaris
                   OpenSolaris
Impact/Access:     Denial of Service -- Existing Account
Resolution:        Patch
CVE Names:         CVE-2009-2596  

Original Bulletin: 
   http://sunsolve.sun.com/search/document.do?assetkey=1-66-264428-1

Revision History:  July 28 2009: CVE Added
                   July 27 2009: Initial Release

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Solution Type Sun Alert

Solution  264428 :   Security Vulnerability in Solaris Auditing Related to 
Extended File Attributes May Allow Local Unprivileged Users to Panic the 
System  

Bug ID
6795688

Product
Solaris 9
Solaris 10
OpenSolaris

Date of Resolved Release
23-Jul-2009

SA Document Body

Security Vulnerability in Solaris Auditing Related to Extended File Attributes 
... (see below)

1. Impact

A 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 122300-39
    * Solaris 10 without patch 140921-01
    * OpenSolaris based upon builds snv_01 through snv_120

x6 Platform

    * Solaris 9 without patch 122301-39
    * Solaris 10 without patch 140922-01
    * 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:

	panic[cpu0]/thread=300018a26a0: BAD TRAP: type=31 rp=2a10033b820 addr=0
	mmu_fsr=0 occurred in module "unix" due to a NULL pointer dereference

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

	die()
	trap()
	ktl0()
   	audit_setfsat_path()
   	[...]
   	fchownat()

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 122300-39 or later
    * Solaris 10 with patch 140921-01 or later
    * OpenSolaris based upon builds snv_121 or later

x86 Platform

    * Solaris 9 with patch 122301-39 or later
    * Solaris 10 with patch 140922-01 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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