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===========================================================================
AUSCERT External Security Bulletin Redistribution
ESB-2013.1394
AIX printer commands vulnerability
7 October 2013
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: AIX 6.1
AIX 7.1
Publisher: IBM
Operating System: AIX
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
Increased Privileges -- Existing Account
Denial of Service -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2013-5419
Original Bulletin:
http://aix.software.ibm.com/aix/efixes/security/cmdque_advisory.asc
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IBM SECURITY ADVISORY
First Issued: Wed Sept 25 15:55:39 CDT 2013
The most recent version of this document is available here:
http://aix.software.ibm.com/aix/efixes/security/cmdque_advisory.asc
===============================================================================
VULNERABILITY SUMMARY
VULNERABILITY: AIX printer commands vulnerability
PLATFORMS: 6.1 and 7.1 releases
SOLUTION: Apply the fix as described below.
THREAT: See below
CVE Numbers: CVE-2013-5419
Reboot required? NO
Workarounds? NO
Protected by FPM? NO
Protected by SED? NO
===============================================================================
DETAILED INFORMATION
I. DESCRIPTION
Printer commands mkque and mkquedev are susceptible to buffer overflow
by users belonging to the 'printq' group. These commands are owned by
'root' and SUID bit set. The group is set to 'printq'. By default, no
users are belong to the 'printq'.
II. CVSS
CVSS Base Score: 6.9
CVSS Temporal Score: See http://xforce.iss.net/xforce/xfdb/87481 for the
current score
CVSS Environmental Score*: Undefined
CVSS String: (AV:L/AC:M/Au:N/C:C/I:C/A:C)
III. PLATFORM VULNERABILITY ASSESSMENT
To determine if your system is vulnerable, execute the following
command:
lslpp -L bos.rte.printers
The following fileset levels are vulnerable:
AIX Fileset Lower Level Upper Level
--------------------------------------------------------
bos.rte.printers 6.1.7.0 6.1.7.16
bos.rte.printers 6.1.8.0 6.1.8.15
bos.rte.printers 7.1.1.0 7.1.1.16
bos.rte.printers 7.1.2.0 7.1.2.15
IV. SOLUTIONS
A. APARS
IBM has assigned the following APARs to this problem:
AIX Level APAR number Availability
---------------------------------------------------
6.1.7 IV47427 08/16/2013 as of SP8
6.1.8 IV47428 08/16/2013 as of SP3
7.1.1 IV47429 08/16/2013 as of sp8
7.1.2 IV47430 08/16/2013 as of SP3
Subscribe to the APARs here:
http://www.ibm.com/support/docview.wss?uid=isg1IV47427
http://www.ibm.com/support/docview.wss?uid=isg1IV47428
http://www.ibm.com/support/docview.wss?uid=isg1IV47429
http://www.ibm.com/support/docview.wss?uid=isg1IV47430
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 http
from:
http://aix.software.ibm.com/aix/efixes/security/cmdque_ifix1.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)
-------------------------------------------------------------------
6.1.7.4 IV47427s4a.130827.epkg.Z
6.1.8.2 IV47428s2a.130827.epkg.Z
7.1.1.4 IV47429s4a.130827.epkg.Z
7.1.2.2 IV47430s2a.130827.epkg.Z
To extract the fixes from the tar file:
tar xvf cmdque_fix1.tar
cd cmdque_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
------------------------------------------------------------------
00b9bbf725a79454f84d14863bbff95fc7dc5211 IV47427s4a.130827.epkg.Z
77c4c9fe10682535a56f3f005c8bdd74d23e98a1 IV47428s2a.130827.epkg.Z
72538c18f0f51280fa76003b6ab017edecfb891b IV47429s4a.130827.epkg.Z
8db97c39b9cccbd384a7e584a658a66fee1d44fe IV47430s2a.130827.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
There are no workarounds.
VI. CONTACT INFORMATION
If you would like to receive AIX Security Advisories via email,
please visit:
http://www.ibm.com/systems/support
and click on the "My notifications" link.
To view previously issued advisories, please visit:
http://www14.software.ibm.com/webapp/set2/subscriptions/onvdq
Comments regarding the content of this announcement can be
directed to:
security-alert@austin.ibm.com
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:
security-alert@austin.ibm.com
B. Download the key from our web page:
http://www.ibm.com/systems/resources/systems_p_os_aix_security_pgpkey.txt
C. 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.
VII. ACKNOWLEDGMENTS
IBM discovered and fixed this vulnerability as part of its
commitment to secure the AIX operating system.
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/78907
CVE-2012-4833: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2012-4833
*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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