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Note: the current version of the following document is available here:
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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

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