[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
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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
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responsible for any damages resulting from user's use or disregard of the
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©Copyright 2007 Hewlett-Packard Development Company, L.P.
Hewlett-Packard Company shall not be liable for technical or editorial errors
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