IBM SECURITY ADVISORY First Issued: Thu Jun 12 16:24:51 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 |Updated: Mon Jul 7 14:26:45 CDT 2014 |Update: Corrected APAR Availability The most recent version of this document is available here: http://aix.software.ibm.com/aix/efixes/security/ntp_advisory.asc https://aix.software.ibm.com/aix/efixes/security/ntp_advisory.asc ftp://aix.software.ibm.com/aix/efixes/security/ntp_advisory.asc =============================================================================== VULNERABILITY SUMMARY VULNERABILITY: Network Time Protocol (NTP) vulnerability in AIX PLATFORMS: AIX 5.3, 6.1 and 7.1 releases VIOS 2.2.* SOLUTION: Apply the fix as described below. THREAT: See below CVE Numbers: CVE-2013-5211 CVSS=5.0 Reboot required? NO Workarounds? YES =============================================================================== DETAILED INFORMATION I. DESCRIPTION The monlist feature in ntpd in NTP allows remote attackers to cause a denial of service (traffic amplification) via forged (1) REQ_MON_GETLIST or (2) REQ_MON_GETLIST_1 requests. II. CVSS CVSS Base Score: 5.0 CVSS Temporal Score: See http://xforce.iss.net/xforce/xfdb/90143 for the current score CVSS Environmental Score*: Undefined CVSS String: (AV:N/AC:L/Au:N/C:N/I:N/A:P) III. PLATFORM VULNERABILITY ASSESSMENT The following fileset levels are vulnerable: NTPv3: AIX Fileset Lower Level Upper Level KEY ------------------------------------------------------- bos.net.tcp.client 5.3.12.0 5.3.12.10 key_w_fs bos.net.tcp.client 6.1.7.0 6.1.7.20 key_w_fs bos.net.tcp.client 6.1.8.0 6.1.8.17 key_w_fs bos.net.tcp.client 6.1.9.0 6.1.9.1 key_w_fs bos.net.tcp.client 7.1.1.0 7.1.1.20 key_w_fs bos.net.tcp.client 7.1.2.0 7.1.2.17 key_w_fs bos.net.tcp.client 7.1.3.0 7.1.3.2 key_w_fs AIX Fileset (VIOS) Lower Level Upper Level --------------------------------------------------------- bos.net.tcp.client 6.1.7.0(2.2.1.0) 6.1.7.20(2.2.1.8) bos.net.tcp.client 6.1.8.0(2.2.2.0) 6.1.8.17(2.2.2.4) bos.net.tcp.client 6.1.9.0(2.2.3.0) 6.1.9.1 (2.2.3.2) NTPv4: AIX Fileset Lower Level Upper Level KEY -------------------------------------------------------- ntp.rte 6.1.6.0 6.1.6.1 key_w_fs ntp.rte 7.1.0.0 7.1.0.1 key_w_fs AIX Fileset (VIOS) Lower Level Upper Level -------------------------------------------------------- ntp.rte 6.1.6.0(2.2.1.0) 6.1.6.1(2.2.1.8) ntp.rte 6.1.6.0(2.2.2.0) 6.1.6.1(2.2.2.4) ntp.rte 6.1.6.0(2.2.3.0) 6.1.6.1(2.2.3.2) NOTE: To find out whether the affected filesets are installed on your systems, refer to the lslpp command found in AIX user's guide. IV. SOLUTIONS A. APARS IBM has assigned the following APARs to the problem: NOTE: APARs are only applicable to NTPv3. For NTPv4 refer to steps mentioned in FIXES section under NTPv4 heading below. AIX Level APAR number Availability KEY ------------------------------------------------------------- | 5.3.12 IV59636 NOW (ifix-only) key_w_apar | 6.1.8 IV58068 12/31/2014 SP6 key_w_apar | 6.1.9 IV56213 10/24/2014 SP4 key_w_apar | 7.1.2 IV55365 12/31/2014 SP6 key_w_apar | 7.1.3 IV56324 10/24/2014 SP4 key_w_apar VIOS Level APAR number Availability --------------------------------------------------- | 2.2.2 IV58068 12/31/2014 2.2.2.5 | 2.2.3 IV56213 10/24/2014 2.2.3.4 Subscribe to the APARs here: http://www.ibm.com/support/docview.wss?uid=isg1IV59636 http://www.ibm.com/support/docview.wss?uid=isg1IV58068 http://www.ibm.com/support/docview.wss?uid=isg1IV56213 http://www.ibm.com/support/docview.wss?uid=isg1IV55365 http://www.ibm.com/support/docview.wss?uid=isg1IV56324 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 NTPv3 (Network Time Protocol Version 3) ======================================= Fixes for NTPv3 are available. The fixes can be downloaded via ftp from: ftp://aix.software.ibm.com/aix/efixes/security/ntp_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. AIX Level Interim Fix (*.Z) KEY -------------------------------------------------- 5.3.12.9 IV59636s9a.140423.epkg.Z key_w_fix 6.1.7.9 IV58413s9a.140421.epkg.Z key_w_fix 6.1.8.4 IV58068s4a.140421.epkg.Z key_w_fix 6.1.9.2 IV56213s1a.140421.epkg.Z key_w_fix 7.1.1.9 IV56575s9a.140421.epkg.Z key_w_fix 7.1.2.4 IV55365s4a.140421.epkg.Z key_w_fix 7.1.3.2 IV56324s2a.140522.epkg.Z key_w_fix VIOS Level Interim Fix (*.Z) ------------------------------------ 2.2.1.8 IV58413s9a.140421.epkg.Z 2.2.2.4 IV58068s4a.140421.epkg.Z 2.2.3.2 IV56213s1a.140421.epkg.Z To extract the fixes from the tar file: tar xvf ntp_fix.tar cd ntp_ifix Verify you have retrieved the fixes intact: The checksums below were generated using the "openssl dgst -sha256 file" command as the followng: openssl dgst -sha256 filename KEY ---------------------------------------------------------------------------------------------------- ed2aa3b4f2076fd24808e20ef32ff7ee70d2c0ff39092954045ef7163b80541a IV59636s9a.140423.epkg.Z key_w_csum a319f02951cbb95a028f75de2548df53c8ad159383b67df5264f8c25fc202cc5 IV58413s9a.140421.epkg.Z key_w_csum 3cdd922dae20c9ffab304badbbe6f8fd893bc057515ecc860aa5afca8867261f IV58068s4a.140421.epkg.Z key_w_csum 014f4cf77b7c3dd0ad94191211da197c6be5b900224db1ec25f5b5bf3506f690 IV56213s1a.140421.epkg.Z key_w_csum 4de291d684a6eec060398086637d0fe7441aaa2e84618313d4662f2ed564a879 IV56575s9a.140421.epkg.Z key_w_csum 649feede9f57aa537b09f350cddbcc1d7a16b782a935bc7a5b4ffbd47bce7fb3 IV55365s4a.140421.epkg.Z key_w_csum 8ec8d0ed64d21642a9d95e43545daca1d9ac910730ee351a3d01fbd5d30c8acd IV56324s2a.140522.epkg.Z key_w_csum 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 -signature .sig openssl dgst -sha1 -verify -signature .sig Published advisory OpenSSL signature file location: http://aix.software.ibm.com/aix/efixes/security/ntp_advisory.asc.sig https://aix.software.ibm.com/aix/efixes/security/ntp_advisory.asc.sig ftp://aix.software.ibm.com/aix/efixes/security/ntp_advisory.asc.sig NTPv4 (Network Time Protocol Version 4) ======================================= A fix is available, and it can be downloaded from: https://www14.software.ibm.com/webapp/iwm/web/reg/download.do?source=aixbp&lang=en_US&S_PKG=NTPv4&cp=UTF-8 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. NTPv3 (Network Time Protocol Version 3) ======================================= 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. NTPv4 (Network Time Protocol Version 4) AIX 6.1 =============================================== NTPv4 Install images v6.1.6.2 for AIX 6.1 ntp4-6.1.6.2.tar To extract the fixes from the tar file tar -xvf ntp4-6.1.6.2.tar To preview the fix installation: cd ntp4-6.1.6.2 installp -apYd . ntp To install the fix package: cd ntp4-6.1.6.2 installp -aXYd . ntp For NTPv4 use on AIX 6.1, please follow steps in link http://publib.boulder.ibm.com/infocenter/aix/v6r1/topic/com.ibm.aix.files/doc/aixfiles/ntp.htm?resultof=%22%6e%74%70%34%22%20 IMPORTANT: The fix will not take affect until any running xntpd servers have been stopped and restarted with the following commands: stopsrc -s xntpd startsrc -s xntpd NTPv4 (Network Time Protocol Version 4) AIX 7.1 =============================================== NTPv4 Install images v7.1.0.2 for AIX 7.1 ntp4-7.1.0.2.tar To extract the fixes from the tar file tar -xvf ntp4-7.1.0.2.tar To preview the fix installation: cd ntp4-7.1.0.2 installp -apYd . ntp To install the fix package: cd ntp4-7.1.0.2 installp -aXYd . ntp For NTPv4 use on AIX 7.1, please follow steps in link http://publib.boulder.ibm.com/infocenter/aix/v7r1/topic/com.ibm.aix.files/doc/aixfiles/ntp.htm?resultof=%22%6e%74%70%34%22%20 IMPORTANT: The fix will not take affect until any running xntpd servers have been stopped and restarted with the following commands: stopsrc -s xntpd startsrc -s xntpd V. WORKAROUNDS Use noquery in your default restrictions to block all status queries. Or Use disable monitor to disable the ntpdc -c monlist command while still allowing other status queries. 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_pubkey.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. ACKNOWLEDGMENTS: IBM discovered and fixed this vulnerability as part of its commitment to secure the AIX operating system. VIII. 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/ CVE-2013-5211: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2013-5211 *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.