===================================================================== CERT-Renater Note d'Information No. 2012/VULN090 _____________________________________________________________________ DATE : 27/02/2012 HARDWARE PLATFORM(S): / OPERATING SYSTEM(S) : IBM AIX versions 5.3, 6.1, 7.1. ====================================================================== http://aix.software.ibm.com/aix/efixes/security/icmp_advisory.asc _______________________________________________________________________ IBM SECURITY ADVISORY First Issued: Fri Feb 24 13:51:34 CST 2012 The most recent version of this document is available here: http://aix.software.ibm.com/aix/efixes/security/icmp_advisory.asc =============================================================================== VULNERABILITY SUMMARY VULNERABILITY: Vulnerability in ICMP packet handling PLATFORMS: AIX 5.3, 6.1, and 7.1 releases SOLUTION: Apply the fix as described below. THREAT: A remote user can create a denial of service on AIX CVE Number: CVE-2011-1385 Reboot required? YES Workarounds? NO Protected by FPM? NO Protected by SED? NO =============================================================================== DETAILED INFORMATION I. DESCRIPTION There is an error in the handling of a particular ICMP packet in which a remote user can cause a denial of service. Note: The ifixes provided also contain the fix for CVE-2012-0194 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 II. CVSS CVSS Base Score: 7.8 CVSS Temporal Score: See http://xforce.iss.net/xforce/xfdb/71616 for the current score CVSS Environmental Score*: Undefined CVSS String: (AV:n/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.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 IV03369 6/13/2012 sp6 6.1.5 IV13672 4/4/2012 sp8 6.1.6 IV13554 4/4/2010 sp7 6.1.7 IV07188 Available sp2 7.1.0 IV04695 4/4/2010 sp5 7.1.1 IV08255 Available sp2 Subscribe to the APARs here: http://www.ibm.com/support/docview.wss?uid=isg1IV03369 http://www.ibm.com/support/docview.wss?uid=isg1IV13672 http://www.ibm.com/support/docview.wss?uid=isg1IV13554 http://www.ibm.com/support/docview.wss?uid=isg1IV07188 http://www.ibm.com/support/docview.wss?uid=isg1IV04695 http://www.ibm.com/support/docview.wss?uid=isg1IV08255 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/icmp_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_IV13827m05.120216.epkg.Z 6.1.5.7 61JVIOS_IV13751m01.120216.epkg.Z 6.1.6.16 61NSP6_IV13820m06.120216.epkg.Z 6.1.7.2 APAR Available 7.1.0.17 71BSP4_IV14210m04.120216.epkg.Z 7.1.1.2 APAR Available VIOS Level Interim Fix (*.Z) ------------------------------------------------------------------- 2.2.1.3 APAR Available 2.2.0.13-FP-24 SP-03 61NVIOS_IV13820m05.120216.epkg.Z 2.1.3.10-FP23 61JVIOS_IV13751m01.120216.epkg.Z 2.1.2.13-FP-22.1 SP-02 61HVIOS_IV13751m3.120216.epkg.Z 2.1.1.10-FP21 61FVIOS_IV13751m1.120216.epkg.Z To extract the fixes from the tar file: tar xvf icmp_fix.tar cd icmp_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 ------------------------------------------------------------------ de065b18169f285d75ea3402c1decd5519f26519 53XSP5_IV13827m05.120216.epkg.Z dce5d25896fb54b0951b3db46cab57f593add288 61JSP7_IV13751m07.120216.epkg.Z ddf145f57a578c3e383797e01c7327532ac5d0de 61NSP6_IV13820m06.120216.epkg.Z a5371edaa3d38b23b622412cb9b5559433a47343 71BSP4_IV14210m04.120216.epkg.Z 2e6f5ad9df56a9931843e150864d4489bf15b15d 61FVIOS_IV13751m1.120216.epkg.Z a45cf9c7342f43e455992a16bb6d310de79cbc2c 61HVIOS_IV13751m3.120216.epkg.Z bc8763b6447f9a62a91153565986caecdf772627 61JVIOS_IV13751m01.120216.epkg.Z 1e67ef000dfcfc71d6930be0c818b4db204d6a3d 61NVIOS_IV13820m05.120216.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/71616 CVE-2011-1385: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2011-1385 *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. ====================================================================== ========================================================= Les serveurs de référence du CERT-Renater http://www.cru.fr/securite http://www.renater.fr ========================================================= + CERT-RENATER | tel : 01-53-94-20-44 + + 23 - 25 Rue Daviel | fax : 01-53-94-20-41 + + 75013 Paris | email: certsvp@renater.fr + =========================================================