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[security bulletin] HPSBUX02181 SSRT061289 rev.2 - HP-UX Running IPFilter, Remote Unauthorized Denial of Service (DoS)



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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@xxxxxxxxxxxxxxxxxxxx/

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@xxxxxx
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@xxxxxx
  Subject: get key

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To review previously published Security Bulletins visit: 
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* 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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