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AUSCERT External Security Bulletin Redistribution
ESB-2009.1072.2
Security Vulnerability in Solaris NFSv4 Kernel Module May
Panic an NFSv4 Client System
21 July 2009
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AusCERT Security Bulletin Summary
---------------------------------
Product: NFSv4
Publisher: Sun Microsystems
Operating System: Solaris
OpenSolaris
Impact/Access: Denial of Service -- Existing Account
Resolution: Patch
CVE Names: CVE-2009-2488
Original Bulletin:
http://sunsolve.sun.com/search/document.do?assetkey=1-66-262788-1
Revision History: July 21 2009: Added CVE reference
July 17 2009: Initial Release
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Solution Type Sun Alert
Solution 262788 : Security Vulnerability in Solaris NFSv4 Kernel Module
May Panic an NFSv4 Client System
Bug ID : 6847540
Product : Solaris 10 Operating System
OpenSolaris
Date of Resolved Release : 15-Jul-2009
SA Document Body
Security Vulnerability in Solaris NFSv4 Kernel Module May Panic an NFSv4
Client System
1. Impact
A security vulnerability in the Solaris NFSv4 kernel module may allow a
local unprivileged user to panic an NFSv4 client system, thereby leading to
a Denial of Service (DoS) condition.
2. Contributing Factors
SPARC Platform
* Solaris 10 with patch 139466-02 or later and without patch 141733-03
* OpenSolaris based upon builds snv_102 through snv_119
x86 Platform
* Solaris 10 with patch 139467-02 or later and without patch 141734-03
* OpenSolaris based upon builds snv_102 through snv_119
Notes:
1. Solaris 8 and 9 are not impacted by this issue
2. Only those systems which have NFSv4 mounted file systems are impacted by
this issue.
To determine if a system has NFSv4 mounted file systems, the following
command may be executed:
$ nfsstat -m | grep "vers=4"
Flags: vers=4,proto=tcp,sec=sys,hard,intr,link,symlink,acl,rsize=1048576,wsize=1048576,retrans=5,timeo=600
NFSv4 mounted file systems include a "vers=4" field in the output of the
nfsstat(1M) command.
3. OpenSolaris distributions may include additional bug fixes above and
beyond the build from which it was derived. The base build can be derived
as follows:
$ uname -v
snv_101
3. Symptoms
Should the described issue occur, the NFSv4 client system may panic with a
stack trace similar to the following:
unix:die()
unix:trap()
unix:ktl0()
nfs:fn_move()
nfs:nfs4rename_persistent_fh()
nfs:nfs4rename()
genunix:fop_rename()
genunix:vn_renameat()
genunix:rename()
4. Workaround
To avoid this issue, use NFSv3 instead of NFSv4. The NFS client system can
be configured not to use NFSv4 by setting NFS_CLIENT_VERSMAX=3 in
/etc/default/nfs. Please refer to nfs(4) documentation.
5. Resolution
This issue is addressed in the following releases:
SPARC Platform
* Solaris 10 with patch 141733-03 or later
* OpenSolaris based upon builds snv_120 or later
x86 Platform
* Solaris 10 with patch 141734-03 or later
* OpenSolaris based upon builds snv_120 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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