07 October 2013
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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== 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 - --------------------------BEGIN INCLUDED TEXT-------------------- - -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 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 18.104.22.168 22.214.171.124 bos.rte.printers 126.96.36.199 188.8.131.52 bos.rte.printers 184.108.40.206 220.127.116.11 bos.rte.printers 18.104.22.168 22.214.171.124 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) ------------------------------------------------------------------- 126.96.36.199 IV47427s4a.130827.epkg.Z 188.8.131.52 IV47428s2a.130827.epkg.Z 184.108.40.206 IV47429s4a.130827.epkg.Z 220.127.116.11 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 email@example.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: firstname.lastname@example.org 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: email@example.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. - -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.13 (AIX) iEYEARECAAYFAlJLBOMACgkQ4fmd+Ci/qhKRTwCglg+x2cyx4HqYXjNyL80/yJ5x LfQAoJT9dUR9bgeza6DZGg+u2wHfVifS =J0eO - -----END PGP SIGNATURE----- - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. If you do not know who that is, please send an email to firstname.lastname@example.org and we will forward your request to the appropriate person. NOTE: Third Party Rights This security bulletin is provided as a service to AusCERT's members. As AusCERT did not write the document quoted above, AusCERT has had no control over its content. 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