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Category:   OS (UNIX)  >   AIX Vendors:   IBM
IBM AIX socketpair() Bug Lets Local Users Deny Service
SecurityTracker Alert ID:  1027126
SecurityTracker URL:  http://securitytracker.com/id/1027126
CVE Reference:   CVE-2012-2192   (Links to External Site)
Date:  Jun 6 2012
Impact:   Denial of service via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 5.3, 6.1, and 7.1
Description:   A vulnerability was reported in IBM AIX. A local user can cause denial of service conditions.

A local user can make a specially crafted socketpair() call to cause the target system to crash.

IBM has assigned APARS IV19178, IV16603, IV21128, IV21131, and IV21235 to this vulnerability.

Impact:   A local user can cause the target system to crash.
Solution:   The vendor has issued a fix.

The vendor's advisory is available at:

http://aix.software.ibm.com/aix/efixes/security/socket_advisory.asc

Vendor URL:  aix.software.ibm.com/aix/efixes/security/socket_advisory.asc (Links to External Site)
Cause:   State error
Underlying OS:  

Message History:   None.


 Source Message Contents

Date:  Wed, 06 Jun 2012 04:44:07 +0000
Subject:  IBM AIX

	
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

IBM SECURITY ADVISORY

First Issued: Tue Jun 5 13:38:09 CDT 2012

The most recent version of this document is available here:

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

VULNERABILITY: Vulnerability in use of socketpair

PLATFORMS: AIX 5.3, 6.1, and 7.1 releases

SOLUTION: Apply the fix as described below

THREAT: 'socketpair()' Local Denial of Service Vulnerability

CVE Number: CVE-2012-2192

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

I. DESCRIPTION

When socketpair calls are used on the system we could see a crash
in socket code path due to the fact that one of the socket is in
the free list

II. CVSS

CVSS Base Score: 4.9
CVSS Temporal Score: See http://xforce.iss.net/xforce/xfdb/76032 for the
current score
CVSS Environmental Score*: Undefined
CVSS String: (AV:L/AC:L/Au:N/C:N/I:N/A:C)

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.rte.security

The following fileset levels are vulnerable:

AIX Fileset Lower Level Upper Level
------------------------------------------------
bos.mp64 5.3.12.0 5.3.12.5
bos.mp64 6.1.6.0 6.1.6.18
bos.mp64 6.1.7.0 6.1.7.3
bos.mp64 7.1.0.0 7.1.0.18
bos.mp64 7.1.1.0 7.1.1.3

IV. SOLUTIONS

A. APARS

IBM has assigned the following APARs to this problem:

AIX Level APAR number Availability
---------------------------------------------------
5.3.12 IV19178 6/13/12 sp6
6.1.6 IV16603 6/12/12 sp8
6.1.7 IV21128 5/18/12 sp4
7.1.0 IV21131 6/13/12 sp6
7.1.1 IV21235 5/18/12 sp4

Subscribe to the APARs here:

http://www.ibm.com/support/docview.wss?uid=isg1IV19178
http://www.ibm.com/support/docview.wss?uid=isg1IV16603
http://www.ibm.com/support/docview.wss?uid=isg1IV21128
http://www.ibm.com/support/docview.wss?uid=isg1IV21131
http://www.ibm.com/support/docview.wss?uid=isg1IV21235

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/socket_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 IV19178s05.120514.epkg.Z
6.1.6.7 IV16603s07.120514.epkg.Z
6.1.7.3 IV21128s03.120514.epkg.Z
7.1.0.5 IV21131s05.120515.epkg.Z
7.1.1.3 IV21235s03.120515.epkg.Z

VIOS Level Interim Fix (*.Z)
-------------------------------------------------------------------
2.2.1.4-FP-25 SP-02 IV21128s04.VIOS2214.120531.epkg.Z

To extract the fixes from the tar file:

tar xvf socket_fix.tar
cd socket_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
------------------------------------------------------------------
a904df000d7f990828f2f41a8c44ddce96e81164 IV16603s07.120514.epkg.Z
d724639209b0bc9e90e8812d1ae6f6ff7e6a5588 IV19178s05.120514.epkg.Z
066359d8724b905769659664dc82323c011008a1 IV21128s03.120514.epkg.Z
d0b075ac9a6f6c249e8c93ae08c3bf0740ec6421
IV21128s04.VIOS2214.120531.epkg.Z
54b5f5a12301d9325993649e07b99e258aa6dfae IV21131s05.120515.epkg.Z
4fca1e8928b520f72ff2c32198a15679299d2040 IV21235s03.120515.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

None

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/76032
CVE-2012-2192: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2012-2192

*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.
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.7 (AIX)

iD8DBQFPznoF4fmd+Ci/qhIRArD4AKCH7m+u4RKvVVuiUZLtr+y7rXbkzACeKsKM
qKegg1taC6yTJuXQV4QiSWg=
=eAXE
-----END PGP SIGNATURE-----

	 

 
 


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