|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
Reboot required? YES
Protected by FPM? NO
Protected by SED? NO
I. DESCRIPTION ( From cve.mitre.org)
GID in NFSv4 is loosely enforced.
CVSS Base Score: 5
CVSS Temporal Score: See http://xforce.iss.net/xforce/xfdb/78431 for the
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
To determine if your system is vulnerable, execute the following
lslpp -L bos.net.nfs.client
The following fileset levels are vulnerable:
AIX Fileset Lower Level Upper Level
bos.net.nfs.client 184.108.40.206 220.127.116.11
bos.net.nfs.client 18.104.22.168 22.214.171.124
bos.net.nfs.client 126.96.36.199 188.8.131.52
bos.net.nfs.client 184.108.40.206 220.127.116.11
bos.net.nfs.client 18.104.22.168 22.214.171.124
IBM has assigned the following APARs to this problem:
AIX Level APAR number Availability
5.3.12 IV17855 Available as of SP6
6.1.6 IV10327 Available as of SP7
6.1.7 IV11629 Available as of SP3
7.1.0 IV26436 12/12/12 sp8
7.1.1 IV12169 Available as of SP4
Subscribe to the APARs here:
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.
Fixes are available. The fixes can be downloaded via ftp
The link above is to a tar file containing this signed
advisory, fix packages, and PGP signatures for each package.
The fixes below include prerequisite checking. This will
enforce the correct mapping between the fixes and AIX
AIX Level Interim Fix (*.Z)
VIOS Level Interim Fix (*.Z)
126.96.36.199-FP-25 SP-02 Included in current SP
To extract the fixes from the tar file:
tar xvf nfsv4_fix1.tar
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
To verify the sum, use the text of this advisory as input to sha1sum.
csum -h SHA1 -i Advisory.asc
sha1sum -c Advisory.asc
These sums should match exactly. The PGP 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@example.com and describe the discrepancy.
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:
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.
There are no workarounds.
VI. CONTACT INFORMATION
If you would like to receive AIX Security Advisories via email,
and click on the “My notifications” link.
To view previously issued advisories, please visit:
Comments regarding the content of this announcement can be
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:
B. Download the key from our web page:
C. Download the key from a PGP Public Key Server. The key ID is:
Please contact your local IBM AIX support center for any
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are property of their respective holders.
IBM discovered and fixed this vulnerability as part of its
commitment to secure the AIX operating system.
Complete CVSS Guide: http://www.first.org/cvss/cvss-guide.html
On-line Calculator V2:
X-Force Vulnerability Database: http://xforce.iss.net/xforce/xfdb/78431
*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