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AUSCERT External Security Bulletin Redistribution
ESB-2008.0832 -- [Solaris]
Security Vulnerability in Solaris 10 NFS Remote Procedure Calls (RPCs) May
Allow a Denial of Service (DoS) or Data Integrity Issues for
Non-Global Zones
1 September 2008
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AusCERT Security Bulletin Summary
---------------------------------
Product: NFS
Publisher: Sun Microsystems
Operating System: Solaris 10
Impact: Modify Arbitrary Files
Denial of Service
Access: Existing Account
CVE Names: CVE-2008-3838
Original Bulletin:
http://sunsolve.sun.com/search/printfriendly.do?assetkey=1-66-240866-1
Revision History: September 1 2008: Added CVE Reference
August 27 2008: Initial Release
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Solution Type: Sun Alert
Solution 240866 : Security Vulnerability in Solaris 10 NFS Remote
Procedure Calls (RPCs) May Allow a Denial of Service (DoS) or Data
Integrity Issues for Non-Global Zones
Bug ID: 6655251
Product
Solaris 10 Operating System
OpenSolaris
Date of Resolved Release: 25-Aug-2008
SA Document Body
Security Vulnerability in Solaris 10 NFS Remote Procedure Calls (RPCs):
1. Impact
A security vulnerability in the NFS Remote Procedure Calls (RPC) zones
implementation may allow a local user with administrative privileges
in a non-global zone to intercept and corrupt NFS traffic destined for
other non-global zones on the system. This may result in a Denial of
Service (DoS) to the NFS services in the affected non-global zones.
Sun acknowledges with thanks, Hewitt Associates for reporting this
issues.
2. Contributing Factors
This issue can occur in the following releases:
SPARC Platform
* Solaris 10 without patch 138070-02
* OpenSolaris based upon builds snv_01 through snv_87
x86 Platform
* Solaris 10 without patch 138071-02
* OpenSolaris based upon builds snv_01 through snv_87
Note 1: Solaris 8 and Solaris 9 are not impacted by this issue.
Note 2: Non-global zones which use Secure NFS (using either
Diffie-Hellman authentication or Kerberos V5 authentication which uses
RPCSEC_GSS) are not impacted by this issue.
Note 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
To determine if a system has a Package Repository Update (PRU)
installed which addresses this issue, execute the following command:
$ pkg contents -o name,value -t set | grep 6655251
com.sun.service.incorporated_changes 6655251
3. Symptoms
If the described issue has been exploited to cause a Denial of
Service, RPC requests from inside non-global zones may fail
unpexpectedly. Failed RPC requests would cause NFS requests to the NFS
server to be retried or to fail. This would be seen by longer access
times for NFS files and/or errors when accessing files shared by NFS.
There are no predictable symptoms that would indicate that this issue
has been exploited to present incorrect data to NFS clients who make
NFS requests to the server.
4. Workaround
To workaround this issue, non-global zones can be configured to use
Secure NFS using either Diffie-Hellman authentication or Kerberos V5
authentication which uses RPCSEC_GSS. Consult the following
documentation for more information about configuring Kerberos for
NFS/RPC:
http://www.sun.com/blueprints/1001/krb.pdf
5. Resolution
This issue is addressed in the following releases:
SPARC Platform
* Solaris 10 with patch 138070-02 or later
* OpenSolaris based upon builds snv_88 or later
x86 Platform
* Solaris 10 with patch 138071-02 or later
* OpenSolaris based upon builds snv_88 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 2000-2008 Sun Microsystems, Inc., 4150 Network Circle, Santa
Clara, CA 95054 U.S.A. All rights reserved
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