IBM SECURITY ADVISORY First Issued: Mon Feb 13 15:32:47 CST 2017 |Updated: Mon Oct 2 10:47:12 CDT 2017 |Update 2: Removed bos.net.tcp.ntp from the impacted fileset list for | AIX 7200-01-02. Fileset bos.net.tcp.ntpd is still listed as impacted | for AIX 7200-01-02. The most recent version of this document is available here: http://aix.software.ibm.com/aix/efixes/security/ntp_advisory8.asc https://aix.software.ibm.com/aix/efixes/security/ntp_advisory8.asc ftp://aix.software.ibm.com/aix/efixes/security/ntp_advisory8.asc Security Bulletin: Vulnerabilities in NTP affect AIX CVE-2016-7427 CVE-2016-7428 CVE-2016-9310 CVE-2016-9311 =============================================================================== SUMMARY: There are multiple vulnerabilities in NTPv3 and NTPv4 that impact AIX. =============================================================================== VULNERABILITY DETAILS: NTPv3 and NTPv4 are vulnerable to: CVEID: CVE-2016-7427 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-7427 DESCRIPTION: NTP is vulnerable to a denial of service, caused by an error in broadcast mode replay prevention functionality. By sending specially crafted NTP packets, a local attacker could exploit this vulnerability to cause a denial of service. CVSS Base Score: 4 CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/119088 for more information. CVSS Environmental Score*: Undefined CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L) CVEID: CVE-2016-7428 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-7428 DESCRIPTION: NTP is vulnerable to a denial of service, caused by an error in broadcast mode poll interval enforcement functionality. By sending specially crafted NTP packets, a remote attacker from within the local network could exploit this vulnerability to cause a denial of service. CVSS Base Score: 4.3 CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/119089 for more information. CVSS Environmental Score*: Undefined CVSS Vector: (CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L) CVEID: CVE-2016-9310 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-9310 DESCRIPTION: NTP is vulnerable to a denial of service, caused by an error in the control mode (mode 6) functionality. By sending specially crafted control mode packets, a remote attacker could exploit this vulnerability to obtain sensitive information and cause the application to crash. CVSS Base Score: 6.5 CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/119087 for more information. CVSS Environmental Score*: Undefined CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L) CVEID: CVE-2016-9311 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-9311 DESCRIPTION: NTP is vulnerable to a denial of service, caused by a NULL pointer dereference when trap service has been enabled. By sending specially crafted packets, a remote attacker could exploit this vulnerability to cause the application to crash. CVSS Base Score: 4.4 CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/119086 for more information. CVSS Environmental Score*: Undefined CVSS Vector: (CVSS:3.0/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H) AFFECTED PRODUCTS AND VERSIONS: AIX 5.3, 6.1, 7.1, 7.2 VIOS 2.2 The following fileset levels are vulnerable: key_fileset = aix For NTPv3: Fileset Lower Level Upper Level KEY PRODUCT(S) ------------------------------------------------------------------ bos.net.tcp.client 5.3.12.0 5.3.12.10 key_w_fs NTPv3 bos.net.tcp.client 6.1.9.0 6.1.9.200 key_w_fs NTPv3 bos.net.tcp.client 7.1.3.0 7.1.3.48 key_w_fs NTPv3 bos.net.tcp.client 7.1.4.0 7.1.4.30 key_w_fs NTPv3 bos.net.tcp.ntp 7.2.0.0 7.2.0.2 key_w_fs NTPv3 bos.net.tcp.ntpd 7.2.0.0 7.2.0.2 key_w_fs NTPv3 bos.net.tcp.ntpd 7.2.1.0 7.2.1.0 key_w_fs NTPv3 For NTPv4: Fileset Lower Level Upper Level KEY PRODUCT(S) ----------------------------------------------------------------- ntp.rte 6.1.6.0 6.1.6.7 key_w_fs NTPv4 ntp.rte 7.1.0.0 7.1.0.7 key_w_fs NTPv4 Note: To find out whether the affected filesets are installed on your systems, refer to the lslpp command found in AIX user's guide. Example: lslpp -L | grep -i ntp.rte REMEDIATION: A. APARS IBM has assigned the following APARs to this problem: For NTPv3: AIX Level APAR Availability SP KEY PRODUCT(S) ------------------------------------------------------------ 5.3.12 IV92194 NA key_w_apar NTPv3 6.1.9 IV91803 ** SP9 key_w_apar NTPv3 7.1.3 IV92193 ** SP9 key_w_apar NTPv3 7.1.4 IV91951 ** SP4 key_w_apar NTPv3 7.2.0 IV92192 ** SP4 key_w_apar NTPv3 7.2.1 IV92067 ** SP2 key_w_apar NTPv3 For NTPv4: AIX Level APAR Availability SP KEY PRODUCT(S) ------------------------------------------------------------ 6.1.9 IV92287 ** SP9 key_w_apar NTPv4 7.1.3 IV92126 ** SP9 key_w_apar NTPv4 7.1.4 IV92126 ** SP4 key_w_apar NTPv4 7.2.0 IV92126 ** SP4 key_w_apar NTPv4 7.2.1 IV92126 ** SP2 key_w_apar NTPv4 ** Please refer to AIX support lifecycle information page for availability of Service Packs: http://www-01.ibm.com/support/docview.wss?uid=isg3T1012517 Subscribe to the APARs here: http://www.ibm.com/support/docview.wss?uid=isg1IV91803 http://www.ibm.com/support/docview.wss?uid=isg1IV91951 http://www.ibm.com/support/docview.wss?uid=isg1IV92192 http://www.ibm.com/support/docview.wss?uid=isg1IV92287 http://www.ibm.com/support/docview.wss?uid=isg1IV92126 http://www.ibm.com/support/docview.wss?uid=isg1IV92194 http://www.ibm.com/support/docview.wss?uid=isg1IV92193 http://www.ibm.com/support/docview.wss?uid=isg1IV92067 https://www.ibm.com/support/docview.wss?uid=isg1IV91803 https://www.ibm.com/support/docview.wss?uid=isg1IV91951 https://www.ibm.com/support/docview.wss?uid=isg1IV92192 https://www.ibm.com/support/docview.wss?uid=isg1IV92287 https://www.ibm.com/support/docview.wss?uid=isg1IV92126 https://www.ibm.com/support/docview.wss?uid=isg1IV92194 https://www.ibm.com/support/docview.wss?uid=isg1IV92193 https://www.ibm.com/support/docview.wss?uid=isg1IV92067 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 or http from: ftp://aix.software.ibm.com/aix/efixes/security/ntp_fix8.tar http://aix.software.ibm.com/aix/efixes/security/ntp_fix8.tar https://aix.software.ibm.com/aix/efixes/security/ntp_fix8.tar The links above are to a tar file containing this signed advisory, interim fixes, and OpenSSL signatures for each interim fix. The fixes below include prerequisite checking. This will enforce the correct mapping between the fixes and AIX Technology Levels. For NTPv3: AIX Level Interim Fix (*.Z) KEY PRODUCT(S) ---------------------------------------------------------- 5.3.12.9 IV92194m9a.170113.epkg.Z key_w_fix NTPv3 6.1.9.6 IV91803m6a.170112.epkg.Z key_w_fix NTPv3 6.1.9.7 IV91803m6a.170112.epkg.Z key_w_fix NTPv3 6.1.9.8 IV91803m6a.170112.epkg.Z key_w_fix NTPv3 7.1.3.5 IV92193m5a.170112.epkg.Z key_w_fix NTPv3 7.1.3.6 IV92193m5a.170112.epkg.Z key_w_fix NTPv3 7.1.3.7 IV92193m5a.170112.epkg.Z key_w_fix NTPv3 7.1.3.8 IV92193m5a.170112.epkg.Z key_w_fix NTPv3 7.1.4.1 IV91951m3a.170113.epkg.Z key_w_fix NTPv3 7.1.4.2 IV91951m3a.170113.epkg.Z key_w_fix NTPv3 7.1.4.3 IV91951m3a.170113.epkg.Z key_w_fix NTPv3 7.2.0.0 IV92192m2a.170112.epkg.Z key_w_fix NTPv3 7.2.0.1 IV92192m2a.170112.epkg.Z key_w_fix NTPv3 7.2.0.2 IV92192m2a.170112.epkg.Z key_w_fix NTPv3 7.2.1.0 IV92067s1a.170112.epkg.Z key_w_fix NTPv3 7.2.1.1 IV92067s1a.170112.epkg.Z key_w_fix NTPv3 VIOS Level Interim Fix (*.Z) KEY PRODUCT(S) ----------------------------------------------------------- 2.2.4.2x IV91803m6a.170112.epkg.Z key_w_fix NTPv3 For NTPv4: AIX Level Interim Fix (*.Z) KEY PRODUCT(S) ---------------------------------------------------------- 6.1.x IV92287m5a.170113.epkg.Z key_w_fix NTPv4 7.1.x IV92126m3a.170106.epkg.Z key_w_fix NTPv4 7.2.x IV92126m3a.170106.epkg.Z key_w_fix NTPv4 All fixes included are cumulative and address previously issued AIX NTP security bulletins with respect to SP and TL. To extract the fixes from the tar file: tar xvf ntp_fix8.tar cd ntp_fix8 Verify you have retrieved the fixes intact: The checksums below were generated using the "openssl dgst -sha256 " command as the following: openssl dgst -sha256 filename KEY ----------------------------------------------------------------------------------------------------- 70044311eab50e798b1a0756b8f7fef368b65ae79c03496c1fbcf5ba8da7b176 IV91803m6a.170112.epkg.Z key_w_csum 8ef346dbd1d7f3d8e9c03b21fa6e2cd1dca88de9d0951675a4787f34bf892f30 IV91951m3a.170113.epkg.Z key_w_csum f6105a97e957651e8a464cfd6edd0ad50a74ba9dffb974925612f68d21fa7857 IV92192m2a.170112.epkg.Z key_w_csum f1ab705600cc8b08dd11a6e12d1b32a2ec89b988557502ffffd6c06dd53936b9 IV92287m5a.170113.epkg.Z key_w_csum 57c9db9c53098f21e837a407e2b2dead1c1c754d44812eb0392d050e697ae2bd IV92126m3a.170106.epkg.Z key_w_csum f8d9c43a2ae724a7a1e69caab5973aed0bb4b6ddc72bc57d038fad6faa680fa1 IV92194m9a.170113.epkg.Z key_w_csum 558db7a325e5d6733bac66f9b01a9dee4a93826163a50992ee99c1cb9f7dfe70 IV92193m5a.170112.epkg.Z key_w_csum eee9aec25443fa496168f7c4cfb289dbfaeed96c8be0fc3cb57b888733e4f9d4 IV92067s1a.170112.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_advisory8.asc.sig https://aix.software.ibm.com/aix/efixes/security/ntp_advisory8.asc.sig ftp://aix.software.ibm.com/aix/efixes/security/ntp_advisory8.asc.sig 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. 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 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. After installation the ntp daemon must be restarted: stopsrc -s xntpd startsrc -s xntpd 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. WORKAROUNDS AND MITIGATIONS: None. =============================================================================== CONTACT US: Note: Keywords labeled as KEY in this document are used for parsing purposes. If you would like to receive AIX Security Advisories via email, please visit "My Notifications": http://www.ibm.com/support/mynotifications https://www.ibm.com/support/mynotifications To view previously issued advisories, please visit: http://www14.software.ibm.com/webapp/set2/subscriptions/onvdq https://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 https://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 via security-alert@austin.ibm.com you can either: A. Download the key from our web page: http://www.ibm.com/systems/resources/systems_p_os_aix_security_pgppubkey.txt https://www.ibm.com/systems/resources/systems_p_os_aix_security_pgppubkey.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. REFERENCES: Complete CVSS v3 Guide: http://www.first.org/cvss/user-guide https://www.first.org/cvss/user-guide On-line Calculator v3: http://www.first.org/cvss/calculator/3.0 https://www.first.org/cvss/calculator/3.0 ACKNOWLEDGEMENTS: None CHANGE HISTORY: First Issued: Mon Feb 13 15:32:47 CST 2017 Updated:Fri Feb 17 18:40:29 CST 2017 Update: New iFixes provided for NTPv3 in AIX 5.3.12.9,6.1.9.6, 6.1.9.8,7.1.3.5,7.1.3.6,7.1.3.7,7.1.3.8,7.1.4.3,7.2.0.0,7.2.0.2 7.2.1.0,7.2.1.1 and VIOS 2.2.4.x. | Updated: Mon Oct 2 10:47:12 CDT 2017 | Update 2: Removed bos.net.tcp.ntp from the impacted fileset list for | AIX 7200-01-02. Fileset bos.net.tcp.ntpd is still listed as impacted | for AIX 7200-01-02. =============================================================================== *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 Security Bulletin. Disclaimer 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.