Hash: SHA1

             AUSCERT External Security Bulletin Redistribution

                         ESB-2009.0600 -- [NetBSD]
                        proplib: Denial of Service
                               24 June 2009


        AusCERT Security Bulletin Summary

Product:              proplib
Publisher:            NetBSD
Operating System:     NetBSD
Impact:               Denial of Service
Access:               Existing Account

Original Bulletin:    

- --------------------------BEGIN INCLUDED TEXT--------------------

Hash: SHA1

		 NetBSD Security Advisory 2009-003

Topic:	proplib crashes on reading bad XML data

Version:	NetBSD-current:		affected prior to March 30, 2009
		NetBSD 5.0:		not affected
		NetBSD 4.0.1:		affected
		NetBSD 4.0:		affected

Severity:	Denial of service

Fixed:		NetBSD-current:		March 30, 2009
		NetBSD-5 branch:	March 30, 2009
			(5.0 includes the fix)
		NetBSD-4-0 branch:	March 31, 2009
			(4.0.2 will include the fix)
		NetBSD-4 branch:	March 31, 2009
			(4.1 will include the fix)

Please note that NetBSD releases prior to 4.0 are no longer supported.
It is recommended that all users upgrade to a supported release.


The proplib library can crash if a badly formatted externalized plist
is presented for import. The crash will happen during the
transformation of the text XML form into a binary list. This bug can
lead to a system panic because many drivers use proplib as a
communication channel.

Technical Details

The proplib library can crash if it is presented with a non-defined
element (e.g. <number>) in the external XML form.  During internalization
proplib will crash by dereferencing a NULL pointer.

Every driver which uses proplib for user to kernel communication is
vulnerable to this bug, allowing a system to be crashed by an ordinary
user with access to the driver.

Solutions and Workarounds

For all NetBSD versions, you need to obtain fixed sources, rebuild and
install a new kernel, and reboot the system.

The fixed source may be obtained from the NetBSD CVS repository.
The following instructions briefly summarize how to upgrade your
kernel.  In these instructions, replace:

  ARCH     with your architecture (from uname -m), and
  KERNCONF with the name of your kernel configuration file.

To update from CVS, re-build, and re-install the kernel:

        # cd src
        # cvs update -d -P common/lib/libprop/prop_object.c
        # ./build.sh kernel=KERNCONF
        # mv /netbsd /netbsd.old
        # cp sys/arch/ARCH/compile/obj/KERNCONF/netbsd /netbsd
        # shutdown -r now

For more information on how to do this, see:


Recompiling and reinstalling the userlevel libprop (located in
src/lib/libprop) may be prudent to prevent unexpected crashes of
userland code, but should not be necessary for security purposes.

In order to recompile and reinstall your userlevel libprop:
	# cd src/lib/libprop
	# make USETOOLS=no cleandir dependall
	# make USETOOLS=no install

Thanks To

Adam Hamsik for the fix and initial analysis of the issue and for
the first draft of this advisory, and to Soren Jacobsen and David
Holland for assistance with the content of this advisory.

Revision History

	2009-06-22	Initial release

More Information

Advisories may be updated as new information becomes available.
The most recent version of this advisory (PGP signed) can be found at

Information about NetBSD and NetBSD security can be found at
http://www.NetBSD.org/ and http://www.NetBSD.org/Security/.

Copyright 2009, The NetBSD Foundation, Inc.  All Rights Reserved.
Redistribution permitted only in full, unmodified form.

$NetBSD: NetBSD-SA2009-003.txt,v 1.1 2009/06/22 19:31:01 tonnerre Exp $
Version: GnuPG v1.4.9 (NetBSD)


- --------------------------END INCLUDED TEXT--------------------

You have received this e-mail bulletin as a result of your organisation's
registration with AusCERT. The mailing list you are subscribed to is
maintained within your organisation, so if you do not wish to continue
receiving these bulletins you should contact your local IT manager. If
you do not know who that is, please send an email to auscert@auscert.org.au
and we will forward your request to the appropriate person.

NOTE: Third Party Rights
This security bulletin is provided as a service to AusCERT's members.  As
AusCERT did not write the document quoted above, AusCERT has had no control
over its content. The decision to follow or act on information or advice
contained in this security bulletin is the responsibility of each user or
organisation, and should be considered in accordance with your organisation's
site policies and procedures. AusCERT takes no responsibility for consequences
which may arise from following or acting on information or advice contained in
this security bulletin.

NOTE: This is only the original release of the security bulletin.  It may
not be updated when updates to the original are made.  If downloading at
a later date, it is recommended that the bulletin is retrieved directly
from the author's website to ensure that the information is still current.

Contact information for the authors of the original document is included
in the Security Bulletin above.  If you have any questions or need further
information, please contact them directly.

Previous advisories and external security bulletins can be retrieved from:


If you believe that your computer system has been compromised or attacked in 
any way, we encourage you to let us know by completing the secure National IT 
Incident Reporting Form at:


Australian Computer Emergency Response Team
The University of Queensland
Qld 4072

Internet Email: auscert@auscert.org.au
Facsimile:      (07) 3365 7031
Telephone:      (07) 3365 4417 (International: +61 7 3365 4417)
                AusCERT personnel answer during Queensland business hours
                which are GMT+10:00 (AEST).
                On call after hours for member emergencies only.

Comment: http://www.auscert.org.au/render.html?it=1967