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AUSCERT External Security Bulletin Redistribution
ESB-2009.1020.2
Solaris Network File System Version 4 (NFSv4)
6 July 2009
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AusCERT Security Bulletin Summary
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Product: Solaris Network File System Version 4 (NFSv4)
Publisher: Sun
Operating System: Solaris
OpenSolaris
Impact/Access: Modify Arbitrary Files -- Remote/Unauthenticated
Resolution: Patch
CVE Names: CVE-2009-2296
Revision History: July 6 2009: Added CVE Reference
July 3 2009: Initial Release
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Solution Type Sun Alert
Solution 262668 : Security Vulnerability in the Solaris Network File System
Version 4 (NFSv4) 'nfs_portmon' Tunable May Allow Unauthorized Network Access
Bug ID : 6808437
Product : Solaris 10 Operating System
OpenSolaris
Date of Resolved Release : 30-Jun-2009
SA Document Body
Security Vulnerability in the Solaris Network File System Version 4 (NFSv4)
'nfs_portmon' Tunable May Allow Unauthorized Network Access
1. Impact
A security vulnerability in the Solaris NFSv4 Server Kernel Module
'nfs_portmon' tunable may allow certain remote unprivileged users to gain
unauthorized network access to share resources, thereby allowing those users
to access (read and write) arbitrary files.
Sun acknowledges with thanks, Anton Lundin for bringing this issue to our
attention
2. Contributing Factors
This issue can occur in the following releases:
SPARC Platform
* Solaris 10 without patch 139991-03
* OpenSolaris based upon builds snv_01 through snv_118
x86 Platform
* Solaris 10 without patch 140109-03
* OpenSolaris based upon builds snv_01 through snv_118
Notes:
1. Solaris 8 and 9 are not impacted by this issue
2. This issue only occurs on systems that are configured as an NFSv4 server.
To determine if a system is configured as an NFSv4 server, the following
command can be run:
$ rpcinfo -l localhost nfs 4
program vers tp_family/name/class address service
100003 4 inet6/tcp/cots_ord ::1.8.1 nfs
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 run:
$ uname -v
snv_116
3. Symptoms
There are no predictable symptoms that would indicate the described issue
has occurred.
4. Workaround
To work around the described issue, the NFS server system may be configured
not to use NFSv4 by setting "NFS_SERVER_VERSMAX=3" in "/etc/default/nfs".
For additional information, please refer to the nfs(4) documentation.
5. Resolution
This issue is addressed in the following releases:
SPARC Platform
* Solaris 10 with patch 139991-03 or later
* OpenSolaris based upon builds snv_119 or later
x86 Platform
* Solaris 10 with patch 140109-03 or later
* OpenSolaris based upon builds snv_119 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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