IBM SECURITY ADVISORY
First Issued: Thu Sept 13 13:43:29 CDT 2012
| Updated: Wed Sept 26 13:25:50 CDT 2012
| Updated: Removed the cve.mitre.org reference
| Updated: Thu Dec 12 12:55:11 CST 2013
| Update: 1. Added KEYs for parsing purposes
| 2. Moved to OpenSSL signature
The most recent version of this document is available here:
VULNERABILITY SUMMARY
VULNERABILITY: AIX NFSv4 vulnerability
PLATFORMS: AIX 5.3, 6.1, and 7.1 releases
SOLUTION: Apply the fix as described below.
THREAT: See below
CVE Numbers: CVE-2012-4817 CVSS=5
Reboot required? YES
Workarounds? NO
Protected by FPM? NO
Protected by SED? NO
===============================================================================
DETAILED INFORMATION
I. DESCRIPTION
GID in NFSv4 is loosely enforced.
II. CVSS
CVSS Base Score: 5
CVSS Temporal Score: See http://xforce.iss.net/xforce/xfdb/78431 for the
current score
CVSS Environmental Score*: Undefined
CVSS String: (AV:N/AC:L/Au:N/C:N/I:N/A:P)
III. PLATFORM VULNERABILITY ASSESSMENT
Note: To use the following commands on VIOS you must first
execute:
oem_setup_env
To determine if your system is vulnerable, execute the following
command:
lslpp -L bos.net.nfs.client
The following fileset levels are vulnerable:
AIX Fileset Lower Level Upper Level KEY
-------------------------------------------------------------------
bos.net.nfs.client 5.3.12.0 5.3.12.5 key_w_fs
bos.net.nfs.client 6.1.6.0 6.1.6.17 key_w_fs
bos.net.nfs.client 6.1.7.0 6.1.7.2 key_w_fs
bos.net.nfs.client 7.1.0.0 7.1.0.20 key_w_fs
bos.net.nfs.client 7.1.1.0 7.1.1.3 key_w_fs
IV. SOLUTIONS
A. APARS
IBM has assigned the following APARs to this problem:
AIX Level APAR number Availability KEY
----------------------------------------------------------------
5.3.12 IV17855 Available SP6 key_w_apar
6.1.6 IV10327 Available SP7 key_w_apar
6.1.7 IV11629 Available SP3 key_w_apar
7.1.0 IV26436 12/12/12 sp8 key_w_apar
7.1.1 IV12169 Available SP4 key_w_apar
Subscribe to the APARs here:
http://www.ibm.com/support/docview.wss?uid=isg1IV17855
http://www.ibm.com/support/docview.wss?uid=isg1IV10327
http://www.ibm.com/support/docview.wss?uid=isg1IV11629
http://www.ibm.com/support/docview.wss?uid=isg1IV26436
http://www.ibm.com/support/docview.wss?uid=isg1IV12169
By subscribing, you will receive periodic email alerting you
to the status of the APAR, and a link to download the fix once
it becomes available.
B. FIXES
Fixes are available. The fixes can be downloaded via ftp
from:
ftp://aix.software.ibm.com/aix/efixes/security/nfsv4_fix1.tar
The link above is to a tar file containing this signed
advisory, fix packages, and OpenSSL signatures for each package.
The fixes below include prerequisite checking. This will
enforce the correct mapping between the fixes and AIX
Technology Levels.
AIX Level Interim Fix (*.Z) KEY
-------------------------------------------------------------------
7.1.0.7 IV26436s07.120907.epkg.Z key_w_fix
VIOS Level Interim Fix (*.Z)
-------------------------------------------------------------------
2.2.1.4-FP-25 SP-02 Included in current SP
To extract the fixes from the tar file:
tar xvf nfsv4_fix1.tar
cd nfsv4_fix1
Verify you have retrieved the fixes intact:
The checksums below were generated using the
"csum -h SHA1" (sha1sum) command is the followng:
csum -h SHA1 (sha1sum) filename
------------------------------------------------------------------
8f42e3c1a5eb3a0d73d7be8d38265544f9abd866 IV26436s07.120907.epkg.Z
To verify the sum, use the text of this advisory as input to sha1sum.
For example:
csum -h SHA1 -i Advisory.asc
sha1sum -c Advisory.asc
These sums should match exactly. The OpenSSL signatures in the tar
file and on this advisory can also be used to verify the
integrity of the fixes. If the sums or signatures cannot be
confirmed, contact IBM AIX Security at
[email protected] and describe the discrepancy.
openssl dgst -sha1 -verify AIX_PSIRT_pub.asc -signature file.asc.sig file.asc
C. FIX AND INTERIM FIX INSTALLATION
IMPORTANT: If possible, it is recommended that a mksysb backup
of the system be created. Verify it is both bootable and
readable before proceeding.
To preview a fix installation:
installp -a -d fix_name -p all # where fix_name is the name of the
# fix package being previewed.
To install a fix package:
installp -a -d fix_name -X all # where fix_name is the name of the
# fix package being installed.
Interim fixes have had limited functional and regression
testing but not the full regression testing that takes place
for Service Packs; however, IBM does fully support them.
Interim fix management documentation can be found at:
http://www14.software.ibm.com/webapp/set2/sas/f/aix.efixmgmt/home.html
To preview an interim fix installation:
emgr -e ipkg_name -p # where ipkg_name is the name of the
# interim fix package being previewed.
To install an interim fix package:
emgr -e ipkg_name -X # where ipkg_name is the name of the
# interim fix package being installed.
V. WORKAROUNDS
There are no workarounds.
VI. CONTACT INFORMATION
If you would like to receive AIX Security Advisories via email,
please visit:
http://www.ibm.com/systems/support
and click on the "My notifications" link.
To view previously issued advisories, please visit:
http://www14.software.ibm.com/webapp/set2/subscriptions/pqvcmjd
Comments regarding the content of this announcement can be
directed to:
[email protected]
To obtain the OpenSSL public key that can be used to verify the
signed advisories and ifixes:
Download the key from our web page:
http://www.ibm.com/systems/resources/systems_p_os_aix_security_pubkey.txt
To obtain the PGP public key that can be used to communicate
securely with the AIX Security Team you can either:
A. Send an email with "get key" in the subject line to:
[email protected]
B. Download the key from our web page:
Please contact your local IBM AIX support center for any
assistance.
eServer is a trademark of International Business Machines
Corporation. IBM, AIX and pSeries are registered trademarks of
International Business Machines Corporation. All other trademarks
are property of their respective holders.
VII. ACKNOWLEDGMENTS
IBM discovered and fixed this vulnerability as part of its
commitment to secure the AIX operating system.
VIII. REFERENCES:
Note: Keywords labeled as KEY in this document are used for parsing purposes.
Complete CVSS Guide: http://www.first.org/cvss/cvss-guide.html
On-line Calculator V2: http://nvd.nist.gov/cvss.cfm?calculator&adv&version=2
X-Force Vulnerability Database: http://xforce.iss.net/xforce/xfdb/78431
CVE-2012-4817: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2012-4817
*The CVSS Environment Score is customer environment specific and will
ultimately impact the Overall CVSS Score. Customers can evaluate the
impact of this vulnerability in their environments by accessing the links
in the Reference section of this Flash.
Note: According to the Forum of Incident Response and Security Teams
(FIRST), the Common Vulnerability Scoring System (CVSS) is an "industry
open standard designed to convey vulnerability severity and help to
determine urgency and priority of response." IBM PROVIDES THE CVSS SCORES
"AS IS" WITHOUT WARRANTY OF ANY KIND, INCLUDING THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. CUSTOMERS ARE
RESPONSIBLE FOR ASSESSING THE IMPACT OF ANY ACTUAL OR POTENTIAL SECURITY
VULNERABILITY.