IBM SECURITY ADVISORY |Updated: Tue Mar 10 11:31:13 CDT 2015 |Update: Changed affected upper file set levels for 6.1.8 and | 7.1.2. The most recent version of this document is available here: http://aix.software.ibm.com/aix/efixes/security/malloc_advisory.asc https://aix.software.ibm.com/aix/efixes/security/malloc_advisory.asc ftp://aix.software.ibm.com/aix/efixes/security/malloc_advisory.asc =============================================================================== VULNERABILITY SUMMARY VULNERABILITY: AIX Malloc vulnerability PLATFORMS: AIX 5.3, 6.1 and 7.1 releases VIOS 2.2.* SOLUTION: Apply the fix as described below THREAT: An attacker could gain lateral or elevated privileges CVE Number: CVE-2014-3074 CVSS=7.2 Reboot required? YES Workarounds? NO Protected by FPM? NO Protected by SED? NO =============================================================================== DETAILED INFORMATION I. DESCRIPTION It has been identified that the runtime linker allows privilege escalation via arbitrary file writes with elevated privileges programs. When MALLOCOPTIONS and MALLOCBUCKETS environment variables are set with bucket statistics options and by executing certain setuid programs, a non-privileged user may able to create a root owned file with 666 permission. In AIX6.1 and above, a local user can also exploit this error using the _LIB_INIT_DBG and _LIB_INIT_DBG_FILE environment variables. II. CVSS CVSS Base Score: 7.2 CVSS Temporal Score: See http://xforce.iss.net/xforce/xfdb/93816 for the current score CVSS Environmental Score*: Undefined CVSS Vector: (AV:L/AC:L/Au:N/C:C/I:C/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.libc The following fileset levels are vulnerable: AIX Fileset Lower Level Upper Level KEY -------------------------------------------------------- bos.rte.libc 5.3.12.0 5.3.12.9 key_w_fs bos.rte.libc 6.1.7.0 6.1.7.20 key_w_fs | bos.rte.libc 6.1.8.0 6.1.8.18 key_w_fs bos.rte.libc 6.1.9.0 6.1.9.15 key_w_fs bos.rte.libc 7.1.1.0 7.1.1.20 key_w_fs | bos.rte.libc 7.1.2.0 7.1.2.18 key_w_fs bos.rte.libc 7.1.3.0 7.1.3.15 key_w_fs AIX Fileset (VIOS) Lower Level Upper Level ---------------------------------------------------------------- bos.rte.libc 6.1.7.0(2.2.1.0) 6.1.7.20(2.2.1.8) | bos.rte.libc 6.1.8.0(2.2.2.0) 6.1.8.18(2.2.2.5) bos.rte.libc 6.1.9.0(2.2.3.0) 6.1.9.15(2.2.3.3) IV. SOLUTIONS A. APARS IBM has assigned the following APARs to this problem: AIX Level APAR number Availability KEY ------------------------------------------------------------ 5.3.12 IV62812 ifix_only n/a key_w_apar 6.1.7 IV62802 ifix_only n/a key_w_apar 6.1.8 IV62803 12/31/2014 SP6 key_w_apar 6.1.9 IV62805 10/24/2014 SP4 key_w_apar 7.1.1 IV62806 ifix_only n/a key_w_apar 7.1.2 IV62807 12/31/2014 SP6 key_w_apar 7.1.3 IV62808 10/24/2014 SP4 key_w_apar VIOS Level APAR number Availability --------------------------------------------------- 2.2.1 IV62802 ifix_only n/a 2.2.2 IV62803 12/31/2014 2.2.2.5 2.2.3 IV62805 10/24/2014 2.2.3.4 Subscribe to the APARs here: http://www.ibm.com/support/docview.wss?uid=isg1IV62812 http://www.ibm.com/support/docview.wss?uid=isg1IV62802 http://www.ibm.com/support/docview.wss?uid=isg1IV62803 http://www.ibm.com/support/docview.wss?uid=isg1IV62805 http://www.ibm.com/support/docview.wss?uid=isg1IV62806 http://www.ibm.com/support/docview.wss?uid=isg1IV62807 http://www.ibm.com/support/docview.wss?uid=isg1IV62808 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 If any of the following Interim Fixes exist, they must be removed first: AIX Level Interim Fix (*.Z) APAR# ---------------------------------------------- 5.3.12.9 n/a 6.1.7.9 IV61313s9a.140610.epkg.Z IV61313 6.1.8.4 IV61311s4a.140610.epkg.Z IV61311 6.1.9.3 IV60935s3a.140610.epkg.Z IV60935 7.1.1.9 IV61315s9a.140611.epkg.Z IV61315 7.1.2.4 IV61314s4a.140610.epkg.Z IV61314 7.1.3.3 IV60940s3a.140610.epkg.Z IV60940 Fixes are available. These supercede and include the original vulnerability fixes in the above list. The fixes can be downloaded via ftp from: ftp://aix.software.ibm.com/aix/efixes/security/malloc_fix.tar The link above is to a tar file containing this signed advisory, fix packages, and OpenSSL signatures for each package. The fixes below include prerequisite checking. This will enforce the correct mapping between the fixes and AIX Technology Levels. Note: these fixes do not include a fix for the bos.adt.prof profiled libc. If this is the case, please call IBM Support for a separate ifix for the profiled libc version if required. AIX Level Interim Fix (*.Z) KEY --------------------------------------------------- 5.3.12.9 IV62812s9a.140728.epkg.Z key_w_fix 6.1.7.9 IV62802s9a.140730.epkg.Z key_w_fix 6.1.8.4 IV62803s4a.140730.epkg.Z key_w_fix 6.1.9.3 IV62805s3a.140731.epkg.Z key_w_fix 7.1.1.9 IV62806s9a.140730.epkg.Z key_w_fix 7.1.2.4 IV62807s4a.140730.epkg.Z key_w_fix 7.1.3.3 IV62808s3a.140731.epkg.Z key_w_fix VIOS Level Interim Fix (*.Z) ------------------------------------- 2.2.1.8 IV62802s9a.140730.epkg.Z 2.2.2.4 IV62803s4a.140730.epkg.Z 2.2.3.3 IV62805s3a.140731.epkg.Z To extract the fixes from the tar file: tar xvf malloc_fix.tar cd malloc_ifix Verify you have retrieved the fixes intact: The checksums below were generated using the "openssl dgst -sha256 file" command is the following: openssl dgst -sha256 filename KEY ---------------------------------------------------------------------------------------------------- b592baf31e12a94c4652a00fce50b7e9d4eaafd0dab5812c3adeef3b20cc86b0 IV62812s9a.140728.epkg.Z key_w_sum 161e521ac69f0959795651049faf0830c9bc26d19a813d4300714e8391422d14 IV62802s9a.140730.epkg.Z key_w_sum f56e41d47a1fd8d4fa2e582b12bd0cf47745a332d5e7fcc560d23073a27f97a6 IV62803s4a.140730.epkg.Z key_w_sum b0505e3dbaa8c5f2be2d4f8e3d4bd3a8c56b089aee272582a88a5606361f822c IV62805s3a.140731.epkg.Z key_w_sum 8583fb86c06dfeca9602424e1602eaf622cf70d09920d3537ab8d05b75690f3d IV62806s9a.140730.epkg.Z key_w_sum e2080763f480ad3d1c65a19fbf478181ffff61ea8238f8b20723d1b5ec20d5d9 IV62807s4a.140730.epkg.Z key_w_sum 3214e13ccc3db908f5791ba5d2d1a5eccf658eeae03ccd94396b3d7e491cd5e3 IV62808s3a.140731.epkg.Z key_w_sum These sums should match exactly. The OpenSSL 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. Published advisory OpenSSL signature file location: http://aix.software.ibm.com/aix/efixes/security/malloc_advisory.asc.sig https://aix.software.ibm.com/aix/efixes/security/malloc_advisory.asc.sig ftp://aix.software.ibm.com/aix/efixes/security/malloc_advisory.asc.sig openssl dgst -sha1 -verify -signature .sig openssl dgst -sha1 -verify -signature .sig 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. To list all installed Interim Fixes: emgr -l To remove an installed Interim Fix: emgr -r -L ipkg_label # where ipgk_label is the label (e.g., # IV61313s9a) of the interim fix # package being removed. 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 "My Notifications": http://www.ibm.com/support/mynotifications 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 OpenSSL public key that can be used to verify the signed advisories and ifixes: Download the key from our web page: http://www.ibm.com/systems/resources/systems_p_os_aix_security_pubkey.txt 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. VIII. ACKNOWLEDGMENTS This vulnerability was reported by Tim Brown from Portcullis Computer Security Ltd. 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/75510 CVE-2014-3074: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-3074 *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. X. CHANGE HISTORY: First Issued: Mon Jun 30 10:24:42 CDT 2014 Updated: Tue Jul 1 12:35:38 CDT 2014 Update: Corrected public key URL. Updated: Wed Jul 2 15:20:29 CDT 2014 Update: Added published advisory OpenSSL signature file. Updated: Thu Jul 3 07:42:49 CDT 2014 Update: Renamed tar file for TNC compliancy Udated: Mon Jul 07 12:58:32 PM CDT 2014 Update: Update to APAR information and fileset keyword Updated: Fri Aug 15 10:10:57 CDT 2014 Update: Cumulative updated Iterim fixes includes new fix Update: for _LIB_INIT_DBG_FILE environment variable exploit. Update: See description below. Updated: Tue Mar 10 11:31:13 CDT 2015 Update: Changed affected upper file set levels for 6.1.8 and 7.1.2.