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Document Subtype: Security Bulletin Document ID: c04084148 Last Updated: 2018-06-12 Release Date: 2014-01-13 Document Version: 5 Potential Security Impact: Remote Denial of Service (DoS) Source: Hewlett Packard Enterprise, HPE Product 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: -r-xr--r-- 1 bin bin 883140 Mar 1 2011 /usr/sbin/xntpd 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 For NTP v4: /usr/sbin/ntpd --version ntpd 4.2.6p5 For XNTP v3.5: what /usr/sbin/ntpd /usr/sbin/xntpd: xntpd version=3.5f, PHNE_41177; Thur Feb 24 16:59:54 IST 2011 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 Version:4 (rev.4) - 24 June 2014 Corrected typos in steps 1a and 1c of RESOLUTION 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 further information, contact normal HP Services support channel. 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 List: A list of HP Security Bulletins, updated periodically, is contained in HP Security Notice HPSN-2011-001 https://support.hpe.com/hpesc/public/docDisplay?docId=emr_na-c02964430 Security Bulletin Archive: A list of recently released Security Bulletins is available here: http://h20566.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 System management and security procedures must be reviewed frequently to maintain system integrity. HPE is continually reviewing and enhancing the security features of software products to provide customers with current secure solutions. "HPE is broadly distributing this Security Bulletin in order to bring to the attention of users of the affected HPE products the important security information contained in this Bulletin. HPE recommends that all users determine the applicability of this information to their individual situations and take appropriate action. HPE does not warrant that this information is necessarily accurate or complete for all user situations and, consequently, HPE will not be responsible for any damages resulting from user's use or disregard of the information provided in this Bulletin. To the extent permitted by law, HPE disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose, title and non-infringement." ©Copyright 2025 Hewlett Packard Enterprise Development LP Hewlett Packard Enterprise Development 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 HPE nor 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 Enterprise Development and the names of Hewlett Packard Enterprise Development products referenced herein are trademarks of Hewlett Packard Enterprise Development in the United States and other countries. Other product and company names mentioned herein may be trademarks of their respective owners.
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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: -r-xr--r-- 1 bin bin 883140 Mar 1 2011 /usr/sbin/xntpd 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 For NTP v4: /usr/sbin/ntpd --version ntpd 4.2.6p5 For XNTP v3.5: what /usr/sbin/ntpd /usr/sbin/xntpd: xntpd version=3.5f, PHNE_41177; Thur Feb 24 16:59:54 IST 2011 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 Version:4 (rev.4) - 24 June 2014 Corrected typos in steps 1a and 1c of RESOLUTION 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 further information, contact normal HP Services support channel. 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 List: A list of HP Security Bulletins, updated periodically, is contained in HP Security Notice HPSN-2011-001 https://support.hpe.com/hpesc/public/docDisplay?docId=emr_na-c02964430 Security Bulletin Archive: A list of recently released Security Bulletins is available here: http://h20566.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