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SUPPORT COMMUNICATION - SECURITY BULLETIN

Document ID: c00837319
Version: 2

HPSBUX02181 SSRT061289 rev.2 - 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: 2007-02-05

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

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

VULNERABILITY SUMMARY
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.

BACKGROUND

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.

AFFECTED VERSIONS

HP-UX B.11.23
============IPF-HP.IPF-MIN
 ->action: remove the patch, disable IPFilter, or install preliminary patch

END AFFECTED VERSIONS
RESOLUTION

Until a patch is available to resolve the issue, the potential vulnerability can be avoided in three ways:
(1) remove PHNE_34474 on HP-UX B.11.23 systems where IPFilter is in use or
(2) disable IPFilter or
 ->(3) install the preliminary patch, UNOF_35938.depot, or manually install libnet.a.

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 vulnerability.

Note that removing PHNE_34474 exposes 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 changes provided by PHNE_34474.

Alternative 2 - Disable IPFilter

Since IPFilter can be used as a defense against many types of exploits, 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 use.

 ->Alternative 3 - Install UNOF_35938.depot or preliminary libnet.a

A preliminary patch is available. The library which resolves the vulnerability is also available for manual installation. The instructions and the patch files are available from hprc.external.hp.com (192.170.19.100):
ftp://ss061289:SS061289@hprc.external.hp.com/ 

The instructions are in: HPSBUX061289_README.txt
cksum: 3912651470 2828
md5sum: 5b2506b16fb97a1ac11ac8ed93eaa1fa

MANUAL ACTIONS: Yes - NonUpdate
HP-UX B.11.23 - Remove PHNE_34474 if installed or disable IPFilter or install preliminary patch

PRODUCT SPECIFIC INFORMATION

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?productNumber=B6834AA 

HISTORY
Version:1 (rev.1) 16 January 2007 Initial release
Version:2 (rev.2) 5 February 2007 UNOF_35938.depot 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

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On the web page: ITRC security bulletins and patch sign-up
Under Step1: your ITRC security bulletins and patches
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To review previously published Security Bulletins visit: http://www.itrc.hp.com/service/cki/secBullArchive.do 

* 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 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."

©Copyright 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.

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