IBM SECURITY ADVISORY First Issued: Mon Aug 19 16:44:22 CDT 2019 The most recent version of this document is available here: http://aix.software.ibm.com/aix/efixes/security/ntp_advisory12.asc https://aix.software.ibm.com/aix/efixes/security/ntp_advisory12.asc ftp://aix.software.ibm.com/aix/efixes/security/ntp_advisory12.asc Security Bulletin: Vulnerability in NTP affects AIX (CVE-2019-8936) =============================================================================== SUMMARY: There is a vulnerability in NTPv3 and NTPv4 that affects AIX. =============================================================================== VULNERABILITY DETAILS: NTPv3 and NTPv4 are vulnerable to: CVEID: CVE-2019-8936 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-8936 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-8936 DESCRIPTION: NTP is vulnerable to a denial of service, caused by a NULL pointer dereference in ntp_control.c. By sending specially crafted mode 6 packets, a remote authenticated attacker could exploit this vulnerability to cause the ntpd daemon to SIGSEGV. CVSS Base Score: 5.3 CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/158926 for the current score CVSS Environmental Score*: Undefined CVSS Vector: (CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H) AFFECTED PRODUCTS AND VERSIONS: AIX 7.1, 7.2 VIOS 2.2, 3.1 The vulnerabilities in the following filesets are being addressed: key_fileset = aix For NTPv3: Fileset Lower Level Upper Level KEY PRODUCT(S) --------------------------------------------------------------------- bos.net.tcp.client 6.1.9.0 6.1.9.403 key_w_fs NTPv3 bos.net.tcp.client 7.1.4.0 7.1.4.35 key_w_fs NTPv3 bos.net.tcp.client 7.1.5.0 7.1.5.33 key_w_fs NTPv3 bos.net.tcp.ntpd 7.2.1.0 7.2.1.3 key_w_fs NTPv3 bos.net.tcp.ntpd 7.2.2.0 7.2.2.17 key_w_fs NTPv3 bos.net.tcp.ntpd 7.2.3.0 7.2.3.15 key_w_fs NTPv3 For NTPv4: Fileset Lower Level Upper Level KEY PRODUCT(S) --------------------------------------------------------------------- ntp.rte 7.4.2.8100 7.4.2.8121 key_w_fs NTPv4 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 bos.net.tcp.client REMEDIATION: A. APARS IBM has assigned the following APARs to this problem: For NTPv3: AIX Level APAR Availability SP KEY PRODUCT(S) ------------------------------------------------------------ 7.1.4 IJ17061 ** N/A key_w_apar NTPv3 7.1.5 IJ17062 ** SP5 key_w_apar NTPv3 7.2.1 IJ17063 ** N/A key_w_apar NTPv3 7.2.2 IJ17064 ** SP5 key_w_apar NTPv3 7.2.3 IJ17065 ** SP4 key_w_apar NTPv3 VIOS Level APAR Availability SP KEY PRODUCT(S) ---------------------------------------------------------------- 2.2.5 IJ17060 ** N/A key_w_apar NTPv3 2.2.6 IJ17060 ** 2.2.6.50 key_w_apar NTPv3 3.1.0 IJ17065 ** 3.1.0.30 key_w_apar NTPv3 For NTPv4: AIX Level APAR Availability SP KEY PRODUCT(S) ------------------------------------------------------------ 7.1.4 IJ17059 ** N/A key_w_apar NTPv4 7.1.5 IJ17059 ** SP5 key_w_apar NTPv4 7.2.1 IJ17059 ** N/A key_w_apar NTPv4 7.2.2 IJ17059 ** SP5 key_w_apar NTPv4 7.2.3 IJ17059 ** SP4 key_w_apar NTPv4 VIOS Level APAR Availability SP KEY PRODUCT(S) ---------------------------------------------------------------- 2.2.5 IJ17059 ** N/A key_w_apar NTPv4 2.2.6 IJ17059 ** 2.2.6.50 key_w_apar NTPv4 3.1.0 IJ17059 ** 3.1.0.30 key_w_apar NTPv4 Subscribe to the APARs here: http://www.ibm.com/support/docview.wss?uid=isg1IJ17060 http://www.ibm.com/support/docview.wss?uid=isg1IJ17061 http://www.ibm.com/support/docview.wss?uid=isg1IJ17062 http://www.ibm.com/support/docview.wss?uid=isg1IJ17063 http://www.ibm.com/support/docview.wss?uid=isg1IJ17064 http://www.ibm.com/support/docview.wss?uid=isg1IJ17065 http://www.ibm.com/support/docview.wss?uid=isg1IJ17059 https://www.ibm.com/support/docview.wss?uid=isg1IJ17060 https://www.ibm.com/support/docview.wss?uid=isg1IJ17061 https://www.ibm.com/support/docview.wss?uid=isg1IJ17062 https://www.ibm.com/support/docview.wss?uid=isg1IJ17063 https://www.ibm.com/support/docview.wss?uid=isg1IJ17064 https://www.ibm.com/support/docview.wss?uid=isg1IJ17065 https://www.ibm.com/support/docview.wss?uid=isg1IJ17059 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 AIX and VIOS fixes are available. The AIX/VIOS fixes can be downloaded via ftp or http from: ftp://aix.software.ibm.com/aix/efixes/security/ntp_fix12.tar http://aix.software.ibm.com/aix/efixes/security/ntp_fix12.tar https://aix.software.ibm.com/aix/efixes/security/ntp_fix12.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. For NTPv3: AIX Level Interim Fix (*.Z) KEY PRODUCT(S) ---------------------------------------------------------- 7.1.4.6 IJ17061m8a.190628.epkg.Z key_w_fix NTPv3 7.1.4.7 IJ17061m8a.190628.epkg.Z key_w_fix NTPv3 7.1.4.8 IJ17061m8a.190628.epkg.Z key_w_fix NTPv3 7.1.5.2 IJ17062m4a.190628.epkg.Z key_w_fix NTPv3 7.1.5.3 IJ17062m4a.190628.epkg.Z key_w_fix NTPv3 7.1.5.4 IJ17062m4a.190628.epkg.Z key_w_fix NTPv3 7.2.1.4 IJ17063m6a.190701.epkg.Z key_w_fix NTPv3 7.2.1.5 IJ17063m6a.190701.epkg.Z key_w_fix NTPv3 7.2.1.6 IJ17063m6a.190701.epkg.Z key_w_fix NTPv3 7.2.2.2 IJ17064m4a.190701.epkg.Z key_w_fix NTPv3 7.2.2.3 IJ17064m4a.190701.epkg.Z key_w_fix NTPv3 7.2.2.4 IJ17064m4a.190701.epkg.Z key_w_fix NTPv3 7.2.3.1 IJ17065m3a.190701.epkg.Z key_w_fix NTPv3 7.2.3.2 IJ17065m3a.190701.epkg.Z key_w_fix NTPv3 7.2.3.3 IJ17065m3a.190701.epkg.Z key_w_fix NTPv3 Please note that the above table refers to AIX TL/SP level as opposed to fileset level, i.e., 7.2.2.2 is AIX 7200-02-02. VIOS Level Interim Fix (*.Z) KEY PRODUCT(S) ----------------------------------------------------------- 2.2.5.40 IJ17060m9a.190628.epkg.Z key_w_fix NTPv3 2.2.5.50 IJ17060m9a.190628.epkg.Z key_w_fix NTPv3 2.2.5.60 IJ17060m9a.190628.epkg.Z key_w_fix NTPv3 2.2.6.20 IJ17060m9a.190628.epkg.Z key_w_fix NTPv3 2.2.6.21 IJ17060m9a.190628.epkg.Z key_w_fix NTPv3 2.2.6.23 IJ17060m9a.190628.epkg.Z key_w_fix NTPv3 2.2.6.30 IJ17060m9a.190628.epkg.Z key_w_fix NTPv3 2.2.6.31 IJ17060m9a.190628.epkg.Z key_w_fix NTPv3 2.2.6.32 IJ17060m9a.190628.epkg.Z key_w_fix NTPv3 2.2.6.40 IJ17060m9a.190628.epkg.Z key_w_fix NTPv3 2.2.6.41 IJ17060m9a.190628.epkg.Z key_w_fix NTPv3 3.1.0.0 IJ17065m3a.190701.epkg.Z key_w_fix NTPv3 3.1.0.10 IJ17065m3a.190701.epkg.Z key_w_fix NTPv3 3.1.0.20 IJ17065m3a.190701.epkg.Z key_w_fix NTPv3 3.1.0.21 IJ17065m3a.190701.epkg.Z key_w_fix NTPv3 For NTPv4: AIX Level Interim Fix (*.Z) KEY PRODUCT(S) ---------------------------------------------------------- 7.1.x IJ17059m9b.190719.epkg.Z key_w_fix NTPv4 7.2.x IJ17059m9b.190719.epkg.Z key_w_fix NTPv4 VIOS Level Interim Fix (*.Z) KEY PRODUCT(S) ----------------------------------------------------------- 2.2.x IJ17059m9b.190719.epkg.Z key_w_fix NTPv4 3.1.0.x IJ17059m9b.190719.epkg.Z key_w_fix NTPv4 To extract the fixes from the tar file: tar xvf ntp_fix12.tar cd ntp_fix12 Verify you have retrieved the fixes intact: The checksums below were generated using the "openssl dgst -sha256 file" command as the following: openssl dgst -sha256 filename KEY ----------------------------------------------------------------------------------------------------- 5543f8cfe79e9b260b1ffd795f1e755d063564cb436e77b56ccf3c806378d2ca IJ17059m9b.190719.epkg.Z key_w_csum fa9702b1406fd3b1437ac333f4a5a35cc8c8b6322a83970fbed6cf3f0ea73d5d IJ17060m9a.190628.epkg.Z key_w_csum 6b15b60f21f0a6e9506373ac5178aaf6a11e12a54087b27120614641222d0c48 IJ17061m8a.190628.epkg.Z key_w_csum 97e5c6ff951552e0b88a7ea61cf4b368844ae9d72721d923176f3c55b7340a0a IJ17062m4a.190628.epkg.Z key_w_csum cd980f0e6ef7c69e5d1ad48eeb4bfc6f621a34747af28bf2c3e161e89fce251b IJ17063m6a.190701.epkg.Z key_w_csum fa52c67254367424a611a269932b6de63c1d404ed9dd6cfa79eab465b91f11c6 IJ17064m4a.190701.epkg.Z key_w_csum 71bfbe4fb5697bc18d5a5d5524c9d64f08040aea04de765d1c1183c532006ef7 IJ17065m3a.190701.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 Support at http://ibm.com/support/ and describe the discrepancy. openssl dgst -sha1 -verify [pubkey_file] -signature [advisory_file].sig [advisory_file] openssl dgst -sha1 -verify [pubkey_file] -signature [ifix_file].sig [ifix_file] Published advisory OpenSSL signature file location: http://aix.software.ibm.com/aix/efixes/security/ntp_advisory12.asc.sig https://aix.software.ibm.com/aix/efixes/security/ntp_advisory12.asc.sig ftp://aix.software.ibm.com/aix/efixes/security/ntp_advisory12.asc.sig C. FIX AND INTERIM FIX INSTALLATION 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 To view previously issued advisories, please visit: http://www14.software.ibm.com/webapp/set2/subscriptions/onvdq Contact IBM Support for questions related to this announcement: http://ibm.com/support/ https://ibm.com/support/ To obtain the OpenSSL public key that can be used to verify the signed advisories and ifixes: Download the key from our web page: ftp://ftp.software.ibm.com/systems/power/AIX/systems_p_os_aix_security_pubkey.txt Please contact your local IBM AIX support center for any assistance. REFERENCES: Complete CVSS v3 Guide: http://www.first.org/cvss/user-guide On-line Calculator v3: http://www.first.org/cvss/calculator/3.0 RELATED INFORMATION: IBM Secure Engineering Web Portal http://www.ibm.com/security/secure-engineering/bulletins.html IBM Product Security Incident Response Blog https://www.ibm.com/blogs/psirt/ Security Bulletin: Vulnerability in NTP affects AIX (CVE-2019-8936) https://www-01.ibm.com/support/docview.wss?uid=ibm10961772 ACKNOWLEDGEMENTS: None. CHANGE HISTORY: First Issued: Mon Aug 19 16:44:22 CDT 2019 =============================================================================== *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.