IBM SECURITY ADVISORY First Issued: Thu May 3 14:40:33 CDT 2012 | Updated: Thu Dec 12 12:55:11 CST 2013 | Update: 1. Added KEYs for parsing purposes | 2. Moved to OpenSSL signature The most recent version of this document is available here: http://aix.software.ibm.com/aix/efixes/security/ldapauth_advisory2.asc ftp://aix.software.ibm.com/aix/efixes/security/ldapauth_advisory2.asc =============================================================================== VULNERABILITY SUMMARY VULNERABILITY: Vulnerability in LDAP Authentication PLATFORMS: AIX 5.3, 6.1, and 7.1 releases SOLUTION: Apply the fix as described below THREAT: A local attacker could gain lateral or elevated privileges CVE Number: CVE-2012-0745 CVSS=6.9 Reboot required? NO Workarounds? YES Protected by FPM? NO Protected by SED? NO =============================================================================== DETAILED INFORMATION I. DESCRIPTION AIX could allow a local attacker to gain elevated privileges on the system, caused by an error in the getpwnam() function when customer extended LDAP user filtering is configured. A local attacker could exploit this vulnerability to gain lateral or elevated privileges on the system. II. CVSS CVSS Base Score: 6.9 CVSS Temporal Score: See http://xforce.iss.net/xforce/xfdb/74679 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 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.security The following fileset levels are vulnerable: AIX Fileset Lower Level Upper Level KEY -------------------------------------------------------- bos.rte.security 5.3.12.0 5.3.12.4 key_w_fs bos.rte.security 6.1.5.0 6.1.5.7 key_w_fs bos.rte.security 6.1.6.0 6.1.6.17 key_w_fs bos.rte.security 6.1.7.0 6.1.7.2 key_w_fs bos.rte.security 7.1.0.0 7.1.0.17 key_w_fs bos.rte.security 7.1.1.0 7.1.1.2 key_w_fs IV. SOLUTIONS A. APARS IBM has assigned the following APARs to this problem: AIX Level APAR number Availability KEY ---------------------------------------------------------- 5.3.12 IV18638 6/13/12 sp6 key_w_apar 6.1.5 IV19097 7/11/12 sp9 key_w_apar 6.1.6 IV19077 6/12/12 sp8 key_w_apar 6.1.7 IV18637 5/18/12 sp4 key_w_apar 7.1.0 IV19098 6/13/12 sp6 key_w_apar 7.1.1 IV18464 5/18/12 sp4 key_w_apar Subscribe to the APARs here: http://www.ibm.com/support/docview.wss?uid=isg1IV18638 http://www.ibm.com/support/docview.wss?uid=isg1IV19097 http://www.ibm.com/support/docview.wss?uid=isg1IV19077 http://www.ibm.com/support/docview.wss?uid=isg1IV18637 http://www.ibm.com/support/docview.wss?uid=isg1IV19098 http://www.ibm.com/support/docview.wss?uid=isg1IV18464 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/ldapauth_fix2.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. AIX Level Interim Fix (*.Z) KEY ------------------------------------------------------------------- 5.3.12.5 IV18638s05.120406.epkg.Z key_w_fix 6.1.5.8 IV19097s8.120406.epkg.Z key_w_fix 6.1.6.7 IV19077s07.120406.epkg.Z key_w_fix 6.1.7.3 IV18637s03.120406.epkg.Z key_w_fix 7.1.0.5 IV19098s5.120406.epkg.Z key_w_fix 7.1.1.3 IV18464s3.120406.epkg.Z key_w_fix VIOS Level Interim Fix (*.Z) ------------------------------------------------------------------- 2.2.1.3-FP-25 SP-01 IV18637s02.120419.epkg.Z 2.2.0.13-FP-24 SP-03 IV19077s05.120419.epkg.Z 2.1.3.10-FP23 IV19097s0.120419.epkg.Z 2.1.2.13-FP-22.1 SP-02 IV19862s03.120419.epkg.Z 2.1.1.10-FP21 IV19863s01.120419.epkg.Z 2.1.0.10-FP20.1 IV19864s02.120419.epkg.Z To extract the fixes from the tar file: tar xvf ldapauth_fix2.tar cd ldapauth_fix2 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 ------------------------------------------------------------------ 5acabc5f6d8a8defda907a789d2af03a237245c4 IV18464s3.120406.epkg.Z 46543c55fbdc7d2318d5a9371146fca59f512461 IV18637s02.120419.epkg.Z 5c76bec73cce06b4c6fde21c9c19fc43c71aabe3 IV18637s03.120406.epkg.Z 38ef5f2f94452dbc551e1d218a17fe356a9e28a3 IV18638s05.120406.epkg.Z 744776462d6d0623e5db3f92014a475d572e6bf7 IV19077s05.120419.epkg.Z 90324f5159cb5d7a4308eb90cd14806a97074300 IV19077s07.120406.epkg.Z db0ed3207d530dcac4cdfb1561a9375ada42dde6 IV19097s0.120419.epkg.Z 02f2eb5a22b6ba7d944c7cf50e8a4508846ca369 IV19097s8.120406.epkg.Z 97b12e3d7ac33cd0805a180b47324089152bb831 IV19098s5.120406.epkg.Z 44680707328ccd275cf4598de79edb8553aa0aeb IV19862s03.120419.epkg.Z c75b65cdaf71c1951eb0fbb9dbacebae0d11bc81 IV19863s01.120419.epkg.Z 8199f2a7f0e671bc4c51d5cde076f07152fb068b IV19864s02.120419.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 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. openssl dgst -sha1 -verify AIX_PSIRT_pub.asc -signature file.asc.sig file.asc 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 Disable extended LDAP user filtering in ldap.cfg 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 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. 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: Note: Keywords labeled as KEY in this document are used for parsing purposes. 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/74679 CVE-2012-0745: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2012-0745 *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.