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[security bulletin] HPSBUX02960 SSRT101419 rev.1 - HP-UX Running NTP, Remote Denial of Service (DoS) Jan 13 2014 09:14PM
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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: 1

HPSBUX02960 SSRT101419 rev.1 - 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: 2014-01-13

Potential Security Impact: Remote Denial of Service (DoS), execution of
arbitrary code

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 version 4.2.6.

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 is
available.

MANUAL ACTIONS: Yes

To prevent the "monlist" DoS vulnerability, configure the following:

Verify the NTPv4 version.

For example:
/usr/sbin/ntpd --version
ntpd 4.2.6p5
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 the following.

# Block all control queries from external systems, allows time services

restrict default noquery

# Allow local queries

restrict 127.0.0.1

Cycle the ntpd daemon.

/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
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

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 (at) hp (dot) com. [email concealed]

Report: To report a potential security vulnerability with any HP supported
product, send Email to: security-alert (at) hp (dot) com [email concealed]

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.

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