-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Note: the current version of the following document is available here: https://h20564.www2.hp.com/portal/site/hpsc/public/kb/ docDisplay?docId=emr_na-c04084148 SUPPORT COMMUNICATION - SECURITY BULLETIN Document ID: c04084148 Version: 3 HPSBUX02960 SSRT101419 rev.3 - HP-UX Running NTP, Remote Denial of Service (DoS) NOTICE: The information in this Security Bulletin should be acted upon as soon as possible. Release Date: 2014-01-13 Last Updated: 2014-05-23 Potential Security Impact: Remote Denial of Service (DoS) Source: Hewlett-Packard Company, HP Software Security Response Team VULNERABILITY SUMMARY A potential security vulnerability has been identified with HP-UX running NTP. The vulnerability could be exploited remotely to create a Denial of Service (DoS). References: CVE-2013-5211 (SSRT101419) SUPPORTED SOFTWARE VERSIONS*: ONLY impacted versions are listed. HP-UX B.11.31 running NTP v4.2.6 or XNTP v3.5 HP-UX B.11.23 running XNTP v3.5 BACKGROUND CVSS 2.0 Base Metrics =========================================================== Reference Base Vector Base Score CVE-2013-5211 (AV:N/AC:L/Au:N/C:N/I:N/A:P) 5.0 =========================================================== Information on CVSS is documented in HP Customer Notice: HPSN-2008-002 RESOLUTION HP has provided the following workaround to temporarily resolve this vulnerability. This bulletin will be revised when a General Release patch for HP-UX B.11.31 is available. NOTE: No patches for XNTP v3.5 on HP-UX B.11.23 and HP-UX B.11.31 will be made. Customers must disable "monlist" as follows. MANUAL ACTIONS: Yes To prevent the "monlist" DoS vulnerability, configure the following: Verify that XNTP is installed, is running on your system, and verify the NTPv4 version. For example: a. Verify XNTP is installed on the system: ls -la /usr/sbin/xntpd For NTP v4: lr-xr--r-- 1 bin bin 14 Aug 9 2013 /usr/sbin/xntpd -> /usr/sbin/ntpd For XNTP v3.5: lr-xr--r-- 1 bin bin 741052 May 9 2013 /usr/sbin/xntpd -> /usr/sbin/ntpd b. Check if the NTP process is running ps -ef | grep ntp For NTP v4: root 124 1 0 06:46:18 ? 0:00 /usr/sbin/ntpd For XNTP v3.5: root 22248 1 0 06:25:28 ? 0:00 /usr/sbin/xntpd c. Verify the NTP v4 version /usr/sbin/ntpd --version For NTP v4: ntpd 4.2.6p5 For XNTP v3.5: ntpd 4.2.6 Revision 0.0 Tue Nov 5 14:21:22 UTC 2012 Modify the ntp.conf on your time server and add either one of the two following entries. Entry Option #1 # Block all control queries from external systems, allows time services restrict default noquery # Allow local queries restrict 127.0.0.1 Entry Option #2 # disable "monitor" queries. This will disable only # monlist queries, even local. disable monitor Cycle the ntpd daemon (for NTP v4 and XNTP v3.5). /sbin/init.d/ntpd stop /sbin/init.d/ntpd start Verification of the workaround. Test on the local time server using the "ntpq -p" command. Verify proper operation with output similar to: remote refid st t when poll reach delay offset disp ====================================== *LOCAL(1) .LOCL. 6 l 13 16 377 0.000 0.000 0.233 On a remote time client, execute ntpdc or xntpdc as follows: # ntpdc -c monlist server.name.with.restrict.or.disable or # xntpdc -c monlist server.name.with.restrict.or.disable A timeout error should occur. # xntpdc -c monlist xyz.hp.com xyz.hp.com: timed out, nothing received ***Request timed out # HISTORY Version:1 (rev.1) - 13 January 2014 Initial release Version:2 (rev.2) - 15 January 2014 Added configuration options in workaround Version:3 (rev.3) - 23 May 2014 Expanded Supported Software Versions scope; added HP-UX B.11.23 and HP-UX B.11.31 XNTP workaround Third Party Security Patches: Third party security patches that are to be installed on systems running HP software products should be applied in accordance with the customer's patch management policy. Support: For issues about implementing the recommendations of this Security Bulletin, contact normal HP Services support channel. For other issues about the content of this Security Bulletin, send e-mail to security-alert@hp.com. Report: To report a potential security vulnerability with any HP supported product, send Email to: security-alert@hp.com Subscribe: To initiate a subscription to receive future HP Security Bulletin alerts via Email: http://h41183.www4.hp.com/signup_alerts.php?jumpid=hpsc_secbulletins Security Bulletin Archive: A list of recently released Security Bulletins is available here: https://h20564.www2.hp.com/portal/site/hpsc/public/kb/secBullArchive/ Software Product Category: The Software Product Category is represented in the title by the two characters following HPSB. 3C = 3COM 3P = 3rd Party Software GN = HP General Software HF = HP Hardware and Firmware MP = MPE/iX MU = Multi-Platform Software NS = NonStop Servers OV = OpenVMS PI = Printing and Imaging PV = ProCurve ST = Storage Software TU = Tru64 UNIX UX = HP-UX Copyright 2014 Hewlett-Packard Development Company, L.P. Hewlett-Packard Company shall not be liable for technical or editorial errors or omissions contained herein. The information provided is provided "as is" without warranty of any kind. To the extent permitted by law, neither HP or its affiliates, subcontractors or suppliers will be liable for incidental,special or consequential damages including downtime cost; lost profits; damages relating to the procurement of substitute products or services; or damages for loss of data, or software restoration. The information in this document is subject to change without notice. Hewlett-Packard Company and the names of Hewlett-Packard products referenced herein are trademarks of Hewlett-Packard Company in the United States and other countries. Other product and company names mentioned herein may be trademarks of their respective owners. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.13 (GNU/Linux) iEYEARECAAYFAlN/06oACgkQ4B86/C0qfVkwzACfT1iOY8mRDPc0c+RTE4M7Ma+r G74AoIup4aq/jwy9Zp6HDIbOc+bxeoDl =p6Pu -----END PGP SIGNATURE-----