Sign Up for Your FREE Weekly SecurityTracker E-mail Alert Summary
Put SecurityTracker Vulnerability Alerts on Your Web Site -- It's Free!
Become a Partner and License Our Database or Notification Service
(IBM Issues Fix for AIX) Legato NetWorker 'librpc.dll' Spoofing Lets Remote Users Deny Service and Obtain Potentially Sensitive Information
SecurityTracker Alert ID: 1027049|
SecurityTracker URL: http://securitytracker.com/id/1027049
(Links to External Site)
Date: May 9 2012
Denial of service via network, Disclosure of system information|
Fix Available: Yes Vendor Confirmed: Yes |
Version(s): 5.3, 6.1, and 7.1|
A vulnerability was reported in Legato NetWorker. A remote user can cause denial of service conditions. A remote user can obtain potentially sensitive information. IBM AIX RPC is affected.|
A remote user can send spoofed packets via UDP to access the 'nsrexecd' service. The remote user can unregister existing NetWorker RPC services to cause denial of service conditions or register new RPC services to eavesdrop on process communications to obtain potentially sensitive information.
An anonymous researcher reported this vulnerability via TippingPoint's Zero Day Initiative.
A remote user can cause denial of service conditions.|
A remote user can obtain potentially sensitive information.
IBM has issued a fix for IBM AIX (APARs IV13827, IV13751, IV13820, IV14209, IV14210, and IV14211).|
The IBM advisory is available at:
Access control error|
This archive entry is a follow-up to the message listed below.|
Source Message Contents
Date: Wed, 09 May 2012 05:12:11 +0000|
Subject: IBM AIX
-----BEGIN PGP SIGNED MESSAGE-----
IBM SECURITY ADVISORY
First Issued: Tue May 8 15:22:37 CDT 2012
The most recent version of this document is available here:
VULNERABILITY: Vulnerability in AIX RPC
PLATFORMS: AIX 5.3, 6.1, and 7.1 releases
SOLUTION: Apply the fix as described below.
THREAT: RPC portmapper Access Restriction Bypass
CVE Number: CVE-2011-0321
Reboot required? YES
Protected by FPM? NO
Protected by SED? NO
Vulnerability which allows remote attackers to (1) register or
(2) unregister RPC services, and consequently cause a denial of service
or obtain sensitive information from interprocess communication, via
crafted UDP packets containing service commands.
Note: The ifix provided also contains the fix for CVE-2012-0194 and
CVE-2011-1385 since they affect the same fileset.
See the following for
CVSS Base Score: 6.4
CVSS Temporal Score: See http://xforce.iss.net/xforce/xfdb/64997 for the
CVSS Environmental Score*: Undefined
CVSS String: (AV:N/AC:L/Au:N/C:P/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.tcp.client
The following fileset levels are vulnerable:
AIX Fileset Lower Level Upper Level
bos.net.tcp.client 126.96.36.199 188.8.131.52
bos.net.tcp.client 184.108.40.206 220.127.116.11
bos.net.tcp.client 18.104.22.168 22.214.171.124
bos.net.tcp.client 126.96.36.199 188.8.131.52
bos.net.tcp.client 184.108.40.206 220.127.116.11
bos.net.tcp.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 IV13827 6/13/12 sp6
6.1.5 IV13751 Available
6.1.6 IV13820 Available
6.1.7 IV14209 Available
7.1.0 IV14210 Available
7.1.1 IV14211 Available
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)
126.96.36.199 APAR Available
188.8.131.52 APAR Available
184.108.40.206 APAR Available
220.127.116.11 APAR Available
18.104.22.168 APAR Available
VIOS Level Interim Fix (*.Z)
22.214.171.124 FP25 SP0 Fix included in this level
To extract the fixes from the tar file:
tar xvf rpc_fix.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
firstname.lastname@example.org 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; thus, IBM does not warrant the fully
correct functionality of an interim fix.
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.
Adjust the lowest value from the common path MTUs table based on
Turn off large send function (may have performance impact)
Turn off path MTU discovery (may have performance impact)
VI. OBTAINING FIXES
AIX security fixes can be downloaded from:
AIX fixes can be downloaded from:
NOTE: Affected customers are urged to upgrade to the latest
applicable Technology Level and Service Pack.
VII. CONTACT INFORMATION
If you would like to receive AIX Security Advisories via email,
Comments regarding the content of this announcement can be
To request 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 a PGP Public Key Server. The key ID is:
Please contact your local IBM AIX support center for any
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.
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/64997
*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
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.7 (AIX)
-----END PGP SIGNATURE-----
Go to the Top of This SecurityTracker Archive Page