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IBM SECURITY ADVISORY

First Issued: Tue May 8 15:22:37 CDT 2012

The most recent version of this document is available here:

http://aix.software.ibm.com/aix/efixes/security/rpc_advisory.asc
===============================================================================
VULNERABILITY SUMMARY

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
Workarounds? YES
Protected by FPM? NO
Protected by SED? NO
===============================================================================
DETAILED INFORMATION

I. DESCRIPTION

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
CVE-2012-0194:
http://aix.software.ibm.com/aix/efixes/security/large_send_advisory.asc
CVE-2011-1385:
http://aix.software.ibm.com/aix/efixes/security/icmp_advisory.asc

II. CVSS

CVSS Base Score: 6.4
CVSS Temporal Score: See http://xforce.iss.net/xforce/xfdb/64997 for the
current score
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
execute:

oem_setup_env

To determine if your system is vulnerable, execute the following
command:

lslpp -L bos.net.tcp.client

The following fileset levels are vulnerable:

AIX Fileset Lower Level Upper Level
------------------------------------------------
bos.net.tcp.client     5.3.12.0 5.3.12.5
bos.net.tcp.client     6.1.5.0 6.1.5.7
bos.net.tcp.client     6.1.6.0 6.1.6.16
bos.net.tcp.client     6.1.7.0 6.1.7.1
bos.net.tcp.client     7.1.0.0 7.1.0.17
bos.net.tcp.client     7.1.1.0 7.1.1.1

IV. SOLUTIONS

A. APARS

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:

http://www.ibm.com/support/docview.wss?uid=isg1IV13827
http://www.ibm.com/support/docview.wss?uid=isg1IV13751
http://www.ibm.com/support/docview.wss?uid=isg1IV13820
http://www.ibm.com/support/docview.wss?uid=isg1IV14209
http://www.ibm.com/support/docview.wss?uid=isg1IV14210
http://www.ibm.com/support/docview.wss?uid=isg1IV14211

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/rpc_fix.tar

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
Technology Levels.

AIX Level Interim Fix (*.Z)
-------------------------------------------------------------------
5.3.12.5 53XSP5_IV13827s05.120204.epkg.Z
6.1.5.8 APAR Available
6.1.6.7 APAR Available
6.1.7.2 APAR Available
7.1.0.5 APAR Available
7.1.1.2 APAR Available

VIOS Level Interim Fix (*.Z)
-------------------------------------------------------------------
2.2.1.3 FP25 SP0 Fix included in this level

To extract the fixes from the tar file:

tar xvf rpc_fix.tar
cd rpc_fix

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
------------------------------------------------------------------
022795761c426c52f674a17215097dcebe97b73b IV13827m05.120418.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 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
security-alert@austin.ibm.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; thus, IBM does not warrant the fully
correct functionality of an interim fix.

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

Adjust the lowest value from the common path MTUs table based on
customer configuration.
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:

ftp://aix.software.ibm.com/aix/efixes/security

AIX fixes can be downloaded from:

http://www.ibm.com/eserver/support/fixes/fixcentral/main/pseries/aix

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,
please visit:

http://www14.software.ibm.com/webapp/set2/subscriptions/pqvcmjd

Comments regarding the content of this announcement can be
directed to:

security-alert@austin.ibm.com

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:

security-alert@austin.ibm.com

B. Download the key from a PGP Public Key Server. The key ID is:

0x28BFAA12

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.

VIII. REFERENCES:

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/64997
CVE-2011-0321: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2011-0321

*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.
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