IBM SECURITY ADVISORY First Issued : Thu Aug 28 03:15:00 CDT 2014 | Updated: Fri Sep 5 01:11:34 CDT 2014 | Update: The same ifix with a packaging change has been added in | Update: "A. FIXES" section. The most recent version of this document is available here: http://aix.software.ibm.com/aix/efixes/security/nas_advisory1.asc https://aix.software.ibm.com/aix/efixes/security/nas_advisory1.asc ftp://aix.software.ibm.com/aix/efixes/security/nas_advisory1.asc =============================================================================== VULNERABILITY SUMMARY 1.VULNERABILITY: AIX NAS denial of service vulnerability PLATFORMS: AIX 5.3, 6.1 and 7.1 VIOS 2.2.* SOLUTION: Apply the fix as described below. THREAT: See below CVE Numbers: CVE-2014-4341 Reboot required? NO Workarounds? NO Protected by FPM? NO Protected by SED? NO 2. VULNERABILITY: AIX NAS double-free in SPNEGO PLATFORMS: AIX 5.3, 6.1 and 7.1 VIOS 2.2.* SOLUTION: Apply the fix as described below. THREAT: See below CVE Numbers: CVE-2014-4343 Reboot required? NO Workarounds? NO Protected by FPM? NO Protected by SED? NO 3. VULNERABILITY: AIX NAS null deref in SPNEGO acceptor PLATFORMS: AIX 5.3, 6.1 and 7.1 VIOS 2.2.* SOLUTION: Apply the fix as described below. THREAT: See below CVE Numbers: CVE-2014-4344 Reboot required? NO Workarounds? NO Protected by FPM? NO Protected by SED? NO =============================================================================== DETAILED INFORMATION I. DESCRIPTION 1. CVE-2014-4341 Remote attackers can cause a denial of service (buffer over-read and application crash) by injecting invalid tokens into a GSSAPI application session 2. CVE-2014-4343 An unauthenticated remote attacker with the ability to spoof packets appearing to be from a GSSAPI acceptor can cause a double-free condition in GSSAPI initiators(clients) which are using the SPNEGO mechanism, by returning a different underlying mechanism than was proposed by the initiator 3. CVE-2014-4344 An unauthenticated or partially authenticated remote attacker can cause a NULL dereference and application crash during a SPNEGO negotiation by sending an empty token as the second or later context token from initiator to acceptor. II. CVSS 1. CVE-2014-4341 CVSS Base Score: 5.0 CVSS Temporal Score: http://xforce.iss.net/xforce/xfdb/94904 CVSS Environmental Score*: Undefined CVSS Vector: (AV:N/AC:L/Au:N/C:C/I:N/A:N) 2. CVE-2014-4343 CVSS Base Score: 5.0 CVSS Temporal Score: http://xforce.iss.net/xforce/xfdb/95211 CVSS Environmental Score*: Undefined CVSS Vector: (AV:N/AC:L/Au:N/C:C/I:N/A:N) 3. CVE-2014-4344 CVSS Base Score: 5.0 CVSS Temporal Score: http://xforce.iss.net/xforce/xfdb/95210 CVSS Environmental Score*: Undefined CVSS Vector: (AV:N/AC:L/Au:N/C:C/I:N/A:N) III. PLATFORM VULNERABILITY ASSESSMENT To determine if your system is vulnerable, execute the following command to obtain the NAS fileset level: lslpp -L krb5.client.rte lslpp -L krb5.server.rte The following NAS fileset levels are vulnerable: A. CVE-2014-4341 All krb5.server.rte/krb5.client.rte fileset levels 1.5.0.* and 1.6.0.1 are impacted B. CVE-2014-4343, CVE-2014-4344 Only krb5.server.rte/krb5.client.rte fileset levels 1.5.0.3, 1.5.0.4 and 1.6.0.1 are impacted IV. SOLUTIONS A. FIXES Fix is available. The fix can be downloaded via ftp from: ftp://aix.software.ibm.com/aix/efixes/security/nas1_fix.tar The above link 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 releases. | Note that, there is no change in the ifix. The updated ifix is only a | packaging change for the same ifix and applicable on machines which has | only krb5.client.rte fileset. | If a ifix is already applied, then it is not required to apply the | updated ifix | To verify if the ifix has already been applied: | AIX Level 5.3, 6.1, 7.1 and VIOS Level 2.2.* | -------------------------------------------- | krb5.client.rte FILSET-LEVEL COMMAND-TO-VERIY | 1.5.0.6 emgr -cL 1506_fix | 1.6.0.1 emgr -cL 1601_fix | If the result of the above command is FAILURE, then apply the below updated | interim fixes. If the result is SUCCESS, then it is not required to apply the | fixes again. The tar file contains Interim fixes that are based on NAS fileset levels. AIX Level 5.3, 6.1, 7.1 and VIOS Level 2.2.* -------------------------------------------- | If the NAS fileset level is at 1.5.0.6 then apply the ifix 1506_fix.140903.epkg.Z | If the NAS fileset level is at 1.6.0.1 then apply the ifix 1601_fix.140903.epkg.Z If the NAS fileset level is at 1.5.0.3/1.5.0.4, then upgrade to | fileset level 1.6.0.1 and apply the ifix 1601_fix.140903.epkg.Z For other fileset level, upgrade to fileset level 1.5.0.6 | and apply the ifix 1506_fix.140903.epkg.Z These fixes will also be part of the next filesets of NAS versions 1.5.0.7 and 1.6.0.2 These filesets will be made available by 14th November 2014 and can be downloaded from - https://www14.software.ibm.com/webapp/iwm/web/reg/download.do?source=aixbp&lang=en_US&S_PKG=nas&cp=UTF-8 To extract the fix from the tar file: tar xvf nas1_fix.tar cd nas1_fix Verify you have retrieved the fix intact: The checksums below were generated using the "openssl dgst -sha256 file" command is the followng: openssl dgst -sha256 filename ------------------------------------------------------------------------------------------- | c1faaaebf02dabae66bd8752e1ef139201132e106fbe734a2db3c9a9e186b7b4 1506_fix.140903.epkg.Z | ea7461e033560aeba7db7ede9ba3f5e81bb0a533af4dc30a9cd13eaa48926bf0 1601_fix.140903.epkg.Z 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/nas_advisory1.asc.sig | https://aix.software.ibm.com/aix/efixes/security/nas_advisory1.asc.sig | ftp://aix.software.ibm.com/aix/efixes/security/nas_advisory1.asc.sig openssl dgst -sha1 -verify -signature .sig openssl dgst -sha1 -verify -signature .sig B. 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 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: 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_pgpkey.txt 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: 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. VII. REFERENCES: Note: Keywords labeled as KEY in this document are used for parsing purposes. 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. 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 CVE-2014-4341 : http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-4341 CVE-2014-4343 : http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-4343 CVE-2014-4344 : http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-4344 *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.