IBM SECURITY ADVISORY First Issued : Thu May 21 05:06:05 CDT 2015 The most recent version of this document is available here: http://aix.software.ibm.com/aix/efixes/security/nas_advisory3.asc https://aix.software.ibm.com/aix/efixes/security/nas_advisory3.asc ftp://aix.software.ibm.com/aix/efixes/security/nas_advisory3.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-2014-5352 Reboot required? NO Workarounds? NO Protected by FPM? NO Protected by SED? NO 2. VULNERABILITY: AIX NAS Denial of Service via a zero-byte version string or by omitting the '\0' character 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-2014-5355 Reboot required? NO Workarounds? NO Protected by FPM? NO Protected by SED? NO 3. VULNERABILITY: AIX NAS Denial of Service via malformed XDR data 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-2014-9421 Reboot required? NO Workarounds? NO Protected by FPM? NO Protected by SED? NO 4. VULNERABILITY: AIX NAS allows remote users to obtain administrative access by leveraging access to a two-component principal 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-2014-9422 Reboot required? NO Workarounds? NO Protected by FPM? NO Protected by SED? NO 5. VULNERABILITY: AIX NAS allows remote users to obtain sensitive information from process heap memory 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-2014-9423 Reboot required? NO Workarounds? NO Protected by FPM? NO Protected by SED? NO =============================================================================== DETAILED INFORMATION I. DESCRIPTION 1. CVE-2014-5352 Security context handles are not properly maintained, which allows remote authenticated users to cause a denial of service(use-after-free and double free, and daemon crash) or possibly execute arbitrary code via crafted GSSAPI traffic. 2. CVE-2014-5355 A remote attackers can cause a denial of service (NULL pointer dereference) via a zero-byte version string or cause a denial of service(out-of-bounds read) by omitting the '\0' character. 3. CVE-2014-9421 Remote authenticated users can cause a denial of service (use-after-free and double free, and daemon crash) or possibly execute arbitrary code via malformed XDR data. 4. CVE-2014-9422 A remote authenticated users can obtain administrative access by leveraging access to a two-component principal with an initial "kadmind" substring. 5. CVE-2014-9423 A remote attackers can obtain sensitive information from process heap memory by sniffing the network for data in a handle field II. CVSS 1. CVE-2014-5352 CVSS Base Score: 9.0 CVSS Temporal Score: https://exchange.xforce.ibmcloud.com/vulnerabilities/100842 CVSS Environmental Score*: Undefined CVSS Vector: (AV:N/AC:L/Au:S/C:C/I:C/A:C) 2. CVE-2014-5355 CVSS Base Score: 5.0 CVSS Temporal Score: https://exchange.xforce.ibmcloud.com/vulnerabilities/100972 CVSS Environmental Score*: Undefined CVSS Vector: (AV:N/AC:L/Au:N/C:N/I:N/A:P) 3. CVE-2014-9421 CVSS Base Score: 9.0 CVSS Temporal Score: https://exchange.xforce.ibmcloud.com/vulnerabilities/100841 CVSS Environmental Score*: Undefined CVSS Vector: (AV:N/AC:L/Au:S/C:C/I:C/A:C) 4. CVE-2014-9422 CVSS Base Score: 6.1 CVSS Temporal Score: https://exchange.xforce.ibmcloud.com/vulnerabilities/100840 CVSS Environmental Score*: Undefined CVSS Vector: (AV:N/AC:H/Au:S/C:P/I:P/A:C) 5. CVE-2014-9423 CVSS Base Score: 5.0 CVSS Temporal Score: https://exchange.xforce.ibmcloud.com/vulnerabilities/100839 CVSS Environmental Score*: Undefined CVSS Vector: (AV:N/AC:L/Au:N/C:P/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 fileset levels are vulnerable: AIX Fileset Lower Level Upper Level ------------------------------------------ krb5.client.rte 1.4.0.8 1.6.0.2 krb5.server.rte 1.4.0.8 1.6.0.2 Note, 1.4.0.8 is the Lowest NAS version available in aix web download site. Even NAS version below this 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/nas3_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. 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 1.5.0.7 then apply the ifix - 1507c_fix.150404.epkg.Z if only krb5.client.rte is installed 1507s_fix.150407.epkg.Z if krb5.server.rte is installed If the NAS fileset level is at 1.6.0.2 then apply the ifix - 1602c_fix.150404.epkg.Z if only krb5.client.rte is installed 1602s_fix.150407.epkg.Z if krb5.server.rte is installed If the NAS fileset level is at 1.5.0.3/1.5.0.4, then upgrade to fileset level 1.6.0.2 and apply the ifix - 1602c_fix.150404.epkg.Z if only krb5.client.rte is installed 1602s_fix.150407.epkg.Z if krb5.server.rte is installed For other fileset level, upgrade to fileset level 1.5.0.7 and apply the ifix - 1507c_fix.150404.epkg.Z if only krb5.client.rte is installed 1507s_fix.150407.epkg.Z if krb5.server.rte is installed To extract the fix from the tar file: tar xvf nas3_fix.tar cd nas3_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 ------------------------------------------------------------------------------------------- 4dc9f7af7f281d3b1b679230d7c957a107b0e14e471482ef86fbe2cff9a7672f 1507c_fix.150404.epkg.Z fc4a7c777630380294c1835cca32b438882bb503a94b6ce43761a728ac05152b 1507s_fix.150407.epkg.Z dd3356b711e822b5bd4599b4c327d047699cd492eed04d9d5b6c4d3042ef52e9 1602c_fix.150404.epkg.Z a3ff287d83f05476ac64b72baebf17b69ffffc530c06ec44fb63b98359f332b6 1602s_fix.150407.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_advisory3.asc.sig https://aix.software.ibm.com/aix/efixes/security/nas_advisory3.asc.sig ftp://aix.software.ibm.com/aix/efixes/security/nas_advisory13.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-2014-5352 : http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-5352 CVE-2014-5355 : http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-5355 CVE-2014-9421 : http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-9421 CVE-2014-9422 : http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-9422 CVE-2014-9423 : http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-9423 *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.