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TUCoPS :: HP/UX :: tb10369.htm

HP-UX Running TCP/IP (IPv4), Remote Denial of Service (DoS)
HPSBUX01137 SSRT5954 rev.9 - HP-UX Running TCP/IP (IPv4), Remote Denial of Service (DoS)
HPSBUX01137 SSRT5954 rev.9 - HP-UX Running TCP/IP (IPv4), Remote Denial of Service (DoS)

Hash: SHA1


Document ID: c00571568
Version: 9

HPSBUX01137 SSRT5954 rev.9 - 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: 2007-04-02

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 (DoS). 

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 subsequent 

HP-UX B.11.11 
- ->action: install revision A.02.00.01 and TOUR 3.0 

HP-UX B.11.23 
- ->action: install revision A.02.00.01 and PHNE_32606 or subsequent 

HP-UX B.11.23 
- ->action: install revision A.02.00.01 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 

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 HPSBUX01164. 

Patches and updates are available for IPSec. 
The patches are available from 
IPSec and TOUR (Transport Optional Upgrade Release) are available from 

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

For B.11.23 IPSec: 
- -> IPSec revision A.02.00.01 and PHNE_32606 or subsequent 
- -> IPSec revision A.02.00.01 and TOUR 3.0 

MANUAL ACTIONS: Yes - NonUpdate 
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 
Install IPSec revision A.01.07.02 and TOUR 3.0 

B11.23 running IPSec 
Install IPSec revision A.02.00.01 and PHNE_32606 or subsequent 
- ->Install IPSec revision A.02.00.01 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: 

rev.0 - 24 April 2005 Initial release 
rev.1 - 25 May 2005 Binary files available per HPSBUX01164 
rev.2 - 1 June 2005 IPSec not included in binary files 
rev.3 - 27 June 2005 PHNE_33159 is available for B.11.11 
rev.4 - 10 July 2005 PHNE_32606 is available for B.11.23 
rev.5 - 24 July 2005 Clarified the Resolution and Manual Actions sections 
Version:7 (rev.6) 5 December 2005 IPSec revisions available 
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 

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: 
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:
  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: 
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 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."

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


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