===================================================================== CERT-Renater Note d'Information No. 2011/VULN285 _____________________________________________________________________ DATE : 04/04/2011 HARDWARE PLATFORM(S) : / OPERATING SYSTEM(S) : AIX version 6.1 running LDAP. ====================================================================== http://aix.software.ibm.com/aix/efixes/security/ldapauth_advisory.asc ______________________________________________________________________ IBM SECURITY ADVISORY First Issued: Thu Mar 31 10:05:05 CDT 2011 The most recent version of this document is available here: http://aix.software.ibm.com/aix/efixes/security/ldapauth_advisory.asc or ftp://aix.software.ibm.com/aix/efixes/security/ldapauth_advisory.asc =============================================================================== VULNERABILITY SUMMARY VULNERABILITY: LDAP login vulnerability applies to AIX 6100-06 PLATFORMS: AIX 6.1 SOLUTION: Apply the fix as described below THREAT: An attacker may login with an incorrect password CERT VU Number: n/a CVE Number: n/a Reboot required? NO Workarounds? NO Protected by FPM? NO (high, medium, or low) Protected by SED? NO =============================================================================== DETAILED INFORMATION I. OVERVIEW After installing bos.rte.security 6.1.6.4 fileset, an LDAP user will be able to log in with an incorrect password. This occurs only when authtype is set to ldap_auth in the /etc/security/ldap/ldap.cfg file. Non-LDAP users can also log in with incorrect passwords if the local users have their SYSTEM attribute in the /etc/security/user file is set to SYSTEM = "LDAP or compat", or the default stanza is set to SYSTEM = "LDAP or compat" and local users do not have SYSTEM set in their own stanza. If local users don't have LDAP in their SYSTEM attribute, then they will not be affected. II. PLATFORM VULNERABILITY ASSESSMENT 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 --------------------------------------------------- bos.rte.security 6.1.6.4 6.1.6.4 III. SOLUTIONS A. APARS IBM has assigned the following APARs to this problem: AIX Level APAR number Availability ---------------------------------------------------- 6.1.6 IZ97416 TBD Subscribe to the APARs here: http://www.ibm.com/support/docview.wss?uid=isg1IZ97416 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 now available. The fixes can be downloaded from: http://aix.software.ibm.com/aix/efixes/security/ldapauth_fix.tar ftp://aix.software.ibm.com/aix/efixes/security/ldapauth_fix.tar The links above are 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 Fix ---------------------------------------------------- 6.1.6 IZ97416s04.110329.epkg.Z To extract the fixes from the tar file: tar xvf ldapauth_fix.tar cd ldapauth_fix Verify you have retrieved the fixes intact: The checksums below were generated using the "sum", "cksum", "csum -h MD5" (md5sum), and "csum -h SHA1" (sha1sum) commands and are as follows: sum filename ------------------------------------ 35429 100 IZ97416s04.110329.epkg.Z cksum filename ------------------------------------------- 3033455980 102107 IZ97416s04.110329.epkg.Z csum -h MD5 (md5sum) filename ---------------------------------------------------------- 19762b32584c2ed966c0392c34318159 IZ97416s04.110329.epkg.Z csum -h SHA1 (sha1sum) filename ------------------------------------------------------------------ 1340021a3b4d47bdeafb96165ecc1cbad9a35ddd IZ97416s04.110329.epkg.Z To verify the sums, use the text of this advisory as input to csum, md5sum, or sha1sum. For example: csum -h SHA1 -i Advisory.asc md5sum -c 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 and describe the discrepancy at the following address: security-alert@austin.ibm.com C. 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. 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. IV. WORKAROUNDS None. V. OBTAINING FIXES AIX security fixes can be downloaded from: http://aix.software.ibm.com/aix/efixes/security or 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. 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/pqvcmjd 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. Download the key from our web page: http://www.ibm.com/systems/resources/systems_p_os_aix_security_pgpkey.txt 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. ====================================================================== ========================================================= Les serveurs de référence du CERT-Renater http://www.urec.fr/securite 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 + =========================================================