HPSBUX02181 SSRT061289 rev.1 - HP-UX Running IPFilter, Remote Unauthorized Denial of Servi...

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HPSBUX02181 SSRT061289 rev.1 - HP-UX Running IPFilter, Remote Unauthorized
Denial of Service (DoS)

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

Release Date: 2007-01-16
Last Updated: 2007-01-16

Potential Security Impact: Remote unauthorized Denial of Service (DoS)

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

A potential security vulnerability has been identified with HP-UX running
IPFilter in combination with PHNE_34474. The vulnerability could be exploited by
a remote unauthorized user to create a Denial of Service (DoS).

References: none

SUPPORTED SOFTWARE VERSIONS*: ONLY impacted versions are listed.
HP-UX B.11.23 running IPFilter with PHNE_34474 installed.


A successful exploit will result in a system crash.

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.11.23
action: remove PHNE_34474 if installed or disable IPFilter



Until a patch is available to resolve the issue, the potential vulnerability can
be avoided in two ways:
(1) removing PHNE_34474 on HP-UX B.11.23 systems where IPFilter is in use or
(2) disabling IPFilter.

To Determine Whether IPFilter is in Use:

If 'ipfstat -io' returns the following, then IPFilter is not in use:

# ipfstat -io
empty list for ipfilter(in)
empty list for ipfilter(out)

Alternative 1 - Remove PHNE_34474

If IPFilter is in use, PHNE_34474 can be removed to avoid the potential

Note that removing PHNE_34474 also removes several defect fixes. For example,
the fix for the following defect would be removed, exposing the system to the
possibility of a memory leak:

SR:8606414192 CR:JAGaf74051 - Connection oriented DLPI streams may see a small
memory leak in rare conditions.

The patch documentation for PHNE_34474 should be consulted for a list of the
other defect fixes provided by PHNE_34474.

Alternative 2 - Disable IPFilter

Since IPFilter can be used as a defense against many types of attacks, the
potential security impact should be considered before disabling IPFilter.

To disable IPFilter:

1. edit /etc/rc.config.d/ipfconf and set IPF_CONF and IPMON_START to 0.
2. run '/sbin/init.d/ipfboot stop'
3. run 'ipfstat -io' as discussed above to verify that IPFilter is no longer in

HP-UX B.11.23 - Remove PHNE_34474 if installed or disable IPFilter


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:

Version:1 (rev.1) 16 January 2007 Initial release

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
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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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