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AUSCERT External Security Bulletin Redistribution
ESB-2012.0711
Vulnerability in AIX system call
27 July 2012
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: AIX
Publisher: IBM
Operating System: AIX
Impact/Access: Denial of Service -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2012-0723
Original Bulletin:
http://aix.software.ibm.com/aix/efixes/security/syscall_advisory.asc
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iBM SECURITY ADVISORY
First Issued: Thu Jul 26 12:59:02 CDT 2012
The most recent version of this document is available here:
http://aix.software.ibm.com/aix/efixes/security/syscall_advisory.asc
===============================================================================
VULNERABILITY SUMMARY
VULNERABILITY: Vulnerability in AIX system call
PLATFORMS: AIX 5.3, 6.1, and 7.1 releases
SOLUTION: Apply the fix as described below
THREAT: 'dupmsg' system call - Local Denial of Service Vulnerability
CVE Number: CVE-2012-0723
Reboot required? YES
Workarounds? NO
Protected by FPM? NO
Protected by SED? NO
===============================================================================
DETAILED INFORMATION
I. DESCRIPTION
A kernel extension call is exported to user space without proper sanity
checks causing a system crash
II. CVSS
CVSS Base Score: 4.9
CVSS Temporal Score: See http://xforce.iss.net/xforce/xfdb/74134 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.mp64
lslpp -L bos.rte.tty
The following fileset levels are vulnerable:
AIX Fileset Lower Level Upper Level
------------------------------------------------
bos.rte.tty 5.3.12.0 5.3.12.4
bos.mp64 6.1.6.0 6.1.6.19
bos.rte.tty 6.1.6.0 6.1.6.18
bos.mp64 6.1.7.0 6.1.7.16
bos.rte.tty 6.1.7.0 6.1.7.16
bos.mp64 7.1.0.0 7.1.0.19
bos.rte.tty 7.1.0.0 7.1.0.18
bos.mp64 7.1.1.0 7.1.1.16
bos.rte.tty 7.1.1.0 7.1.1.16
IV. SOLUTIONS
A. APARS
IBM has assigned the following APARs to this problem:
AIX Level APAR number Availability
---------------------------------------------------
5.3.12 IV22694 1/04/13 sp7
6.1.6 IV22693 12/12/12 sp10
6.1.7 IV22695 12/12/12 sp6
7.1.0 IV22696 12/12/12 sp8
7.1.1 IV22697 12/12/12 sp6
Subscribe to the APARs here:
http://www.ibm.com/support/docview.wss?uid=isg1IV22694
http://www.ibm.com/support/docview.wss?uid=isg1IV22693
http://www.ibm.com/support/docview.wss?uid=isg1IV22695
http://www.ibm.com/support/docview.wss?uid=isg1IV22696
http://www.ibm.com/support/docview.wss?uid=isg1IV22697
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/syscall_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)
-------------------------------------------------------------------
5.3.12.6 IV22694s05.120713.epkg.Z
6.1.6.8 IV22693s07.120713.epkg.Z
6.1.7.5 IV22695s04.120724.epkg.Z
7.1.0.6 IV22696s05.120713.epkg.Z
7.1.1.5 IV22697s04.120724.epkg.Z
VIOS Level Interim Fix (*.Z)
-------------------------------------------------------------------
2.2.1.4-FP-25 SP-02 IV22695s04.120628.epkg.Z
To extract the fixes from the tar file:
tar xvf syscall_fix.tar
cd syscall_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
------------------------------------------------------------------
0bd8bf1dafbf3573b3845d840203b226ceaceddd IV22694s06.120713.epkg.Z
2930727c8e545698b766e15e61d10300fb553646 IV22693m08.120713.epkg.Z
1e657d811861105022ab0afcebac765f441ed02a IV22695s05.120724.epkg.Z
137325da2b1c08964b4aab4c45c01667d065f855 IV22696m06.120713.epkg.Z
06b35e6875cc430b29a6611b5c8f93ce979454c5 IV22697s05.120724.epkg.Z
5e3cb4688e290dfe69519b05a1537e88a65d6ef5 IV22695m04.120628.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; 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
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. ACKNOWLEDGMENTS
This vulnerability was reported by Jakub Wartak.
IX. 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/74134
CVE-2012-0723: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2012-0723
*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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