HPSBUX01137 SSRT5954 Revised - HP-UX TCP/IP Remote Denial of Service (DoS)

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Document ID: c00571568
Version: 7

HPSBUX01137 SSRT5954 Revised - HP-UX TCP/IP 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: 2005-12-05

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 by an unauthorized user to cause a Denial of Service

References: CAN-2005-1192

SUPPORTED SOFTWARE VERSIONS*: ONLY impacted versions are listed.
HP-UX B.11.11, B.11.22, B.11.23.


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

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

HP-UX B.11.23
action: install PHNE_32606

HP-UX B.11.11
 ->action: install revision A.01.07.02 and PHNE_33159 or

HP-UX B.11.11
 ->action: install revision A.2.00.01 and TOUR 3.0

HP-UX B.11.23
 ->action: install revision A.2.00.01 and PHNE_32606 or subsequent

HP-UX B.11.23
 ->action: install revision A.2.00.01 and TOUR 3.0


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 2.


Patches are available for the core TCP/IP product for
B.11.11 and B.11.23 from http://itrc.hp.com

For B.11.11 - PHNE_33159 or subsequent
For B.11.23 - PHNE_32606 or subsequent

Binary files are available for B.11.22 as discussed in

Patches and updates are available for IPSec.
The patches are available from http://itrc.hp.com
IPSec and TOUR (Transport Optional Upgrade Release) are available
from http://www.hp.com/go/softwaredepot

 ->For B.11.11 IPSec:
 -> IPSec revision A.01.07.02 and PHNE_33159 or subsequent
 -> or
 -> IPSec revision A.01.07.02 and TOUR 3.0

 ->For B.11.23 IPSec:
 -> IPSec revision A.2.00.01 and PHNE_32606 or subsequent
 -> or
 -> IPSec revision A.2.00.01 and TOUR 3.0

B.11.22 Install preliminary binary files per HPSBUX01164.

 ->B11.11 running IPSec
 -> Install IPSec revision A.01.07.02 and PHNE_33159 or subsequent
 -> or
 -> Install IPSec revision A.01.07.02 and TOUR 3.0

 ->B11.23 running IPSec
 -> Install IPSec revision A.2.00.01 and PHNE_32606 or subsequent
 -> or
 -> Install IPSec revision A.2.00.01 and TOUR 3.0


HP-UX Security Patch Check: Security Patch Check revision B.02.00
analyzes all HP-issued Security Bulletins to provide a subset of
recommended actions that potentially affect a specific HP-UX
system. For more information:
http://software.hp.com/portal/swdepot/displayProductInfo.do ?

Initial release: 24 April 2005
Update 1: 25 May 2005 Binary files available per HPSBUX01164
Update 2: 1 June 2005 IPSec not included in binary files
Update 3: 27 June 2005 PHNE_33159 is available for B.11.11
Update 4: 10 July 2005 PHNE_32606 is available for B.11.23
Update 5: 24 July 2005 Clarified the Resolution and Manual
                       Actions sections
Update 6: 5 December 2005 IPSec revisions available

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:
http://h30046.www3.hp.com/driverAlertProfile.php?regioncode=NA &

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
Under Step2: your ITRC operating systems
  - verify your operating system selections are checked and

To update an existing subscription:
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,
    MP = HP MPE/iX,
    NS = HP NonStop Servers,
    OV = HP OpenVMS,
    PI = HP Printing & Imaging,
    ST = HP Storage SW,
    TL = HP Trusted Linux,
    TU = HP Tru64 UNIX,
    UX = HP-UX,
    VV = HP Virtual Vault

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 solutions.

"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 non-infringement."

(c)Copyright 2005 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 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 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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