HPSBUX01137 SSRT5954 rev.11 - HP-UX Running TCP/IP (IPv4), Remote Denial of Service (DoS)

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Document ID: c00571568
Version: 11

HPSBUX01137 SSRT5954 rev.11 - HP-UX Running TCP/IP (IPv4), Remote Denial of
Service (DoS)

NOTICE: The information in this Security Bulletin should be acted upon as soon
as possible.

Release Date: 2005-04-24
Last Updated: 2007-10-03

Potential Security Impact: Remote Denial of Service (DoS)

Source: Hewlett-Packard Company, HP Software Security Response Team

A potential security vulnerability has been identified with HP-UX running TCP/IP
(IPv4). This vulnerability could be remotely exploited to cause a Denial of
Service (DoS).

References: CAN-2005-1192

SUPPORTED SOFTWARE VERSIONS*: ONLY impacted versions are listed.
HP-UX B.11.11, B.11.22, B.11.23 running TCP/IP (IPv4)


To determine if an HP-UX system has an affected version, search the output of
"swlist -a revision -l fileset" for one of the filesets listed below. For
affected systems, verify that the recommended action has been taken.


HP-UX B.11.11
action: install PHNE_33159 or subsequent

HP-UX B.11.22
action: install preliminary binary files per Security Bulletin HPSBUX01164

HP-UX B.11.23
action: install PHNE_32606 or subsequent

HP-UX B.11.11
- ->action: install IPSec revision A.02.01.01 or subsequent and PHNE_35351 or

HP-UX B.11.23
- ->action: install IPSec revision A.02.01.01 or subsequent and PHNE_35766 or


Certain network traffic can result in a Denial of Service (DoS) for HP-UX
systems running TCP/IP (IPv4). Receiving a certain packet on any open TCP/IP
connection can result in a Denial of Service (DoS) condition which can only be
corrected by a reboot of the affected system. The Denial of Service (DoS) is
characterized by high cpu utilization and a lack of response on any I/O port
including the system console.

Previous revisions of this Security Bulletin recommended setting
ip_pmtu_strategy to 0 or 3 as a workaround. Patches or updates to resolve the
issue are now available. After these patches or updates are installed the
workaround will no longer be necessary or recommended.
The ip_pmtu_strategy parameter should be restored to the default value of 1.
Note: Previous versions of this Security Bulletin incorrectly stated that the
default value of ip_pmtu_strategy is 2.

To resolve the vulnerability HP has provided patches and updates. Patches are
available from http://itrc.hp.com Updates are available from

HP-UX B.11.11
 without IPSec
 install PHNE_33159 or subsequent
HP-UX B.11.11
 with IPSec
 ->install IPSec revision A.02.01.01 or subsequent and PHNE_35351 or subsequent
HP-UX B.11.23
 without IPSec
 install PHNE_32606 or subsequent
HP-UX B.11.23
 with IPSec
 ->install IPSec revision A.02.01.01 or subsequent and PHNE_35766 or subsequent

For HP-UX B.11.22, install preliminary binary files per Security Bulletin

HP-UX B.11.22 Install preliminary binary files per Security Bulletin


HP-UX Software Assistant: HP-UX Software Assistant is an enhanced application
that replaces HP-UX Security Patch Check. It analyzes all HP-issued Security
Bulletins and lists recommended actions that may apply to a specific HP-UX
system. It can also download patches and create a depot automatically. For more
information see:

Revision:0 (rev.0) - 24 April 2005 Initial release
Revision:1 (rev.1) - 25 May 2005 Binary files available per Security Bulletin
Revision:2 (rev.2) - 1 June 2005 IPSec not included in binary files
Revision:3 (rev.3) - 27 June 2005 PHNE_33159 is available for B.11.11
Revision: 4 (rev.4) - 10 July 2005 PHNE_32606 is available for B.11.23
Revision:5 (rev.5) - 24 July 2005 Clarified the Resolution and Manual Actions
Revision:6 (rev.6) - 5 December 2005 IPSec revisions available
Version:7 (rev.7) - Skipped for formatting reasons
Version:8 (rev.8) - 23 January 2006 Add rev. to title
Version:9 (rev.9) - 2 April 2007 Change A.2.00.01 to A.02.00.01
Version:10 (rev.10) - 30 April 2007 Default value for ip_pmtu_strategy is 1, not
Version:11 (rev.11) - 3 October 2007 IPSec revision A.02.01.01 available

Third Party Security Patches: Third party security patches which 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
It is strongly recommended that security related information being communicated
to HP be encrypted using PGP, especially exploit information.
To get the security-alert PGP key, please send an e-mail message as follows:
  To: security-alert@hp.com
  Subject: get key

Subscribe: To initiate a subscription to receive future HP Security Bulletins
via Email:
On the web page: ITRC security bulletins and patch sign-up
Under Step1: your ITRC security bulletins and patches
  - check ALL categories for which alerts are required and continue.
Under Step2: your ITRC operating systems
  - verify your operating system selections are checked and save.

To update an existing subscription: http://h30046.www3.hp.com/subSignIn.php
Log in on the web page: Subscriber's choice for Business: sign-in.
On the web page: Subscriber's Choice: your profile summary - use Edit Profile to
update appropriate sections.

To review previously published Security Bulletins visit:

* The Software Product Category that this Security Bulletin relates to is
represented by the 5th and 6th characters of the Bulletin number in the title:

GN = HP General SW
MA = HP Management Agents
MI = Misc. 3rd Party SW
NS = HP NonStop Servers
PI = HP Printing & Imaging
ST = HP Storage SW
TL = HP Trusted Linux
TU = HP Tru64 UNIX
VV = HP VirtualVault

System management and security procedures must be reviewed frequently to
maintain system integrity. HP is continually reviewing and enhancing the
security features of software products to provide customers with current secure

"HP is broadly distributing this Security Bulletin in order to bring to the
attention of users of the affected HP products the important security
information contained in this Bulletin. HP recommends that all users determine
the applicability of this information to their individual situations and take
appropriate action. HP does not warrant that this information is necessarily
accurate or complete for all user situations and, consequently, HP 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, HP
disclaims all warranties, either express or implied, including the warranties of
merchantability and fitness for a particular purpose, title and

ęCopyright 2007 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.
Version: PGP 8.1


Yours truly,
HP S/W Security Team
WTEC Cupertino, California

Return-Path: secure@cup.hp.com
Reply-to: security-alert@hp.com

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