-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

===========================================================================
             AUSCERT External Security Bulletin Redistribution

                         ESB-2006.0868 -- [NetBSD]
                       systrace(4) integer overflow
                             28 November 2006

===========================================================================

        AusCERT Security Bulletin Summary
        ---------------------------------

Product:              systrace
Publisher:            NetBSD
Operating System:     NetBSD
Impact:               Root Compromise
                      Denial of Service
Access:               Existing Account
CVE Names:            CVE-2006-5218

Ref:                  ESB-2006.0860

Original Bulletin:    
  ftp://ftp.NetBSD.org/pub/NetBSD/security/advisories/NetBSD-SA2006-024.txt.asc

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

- -----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1


		 NetBSD Security Advisory 2006-024
		 =================================

Topic:		systrace(4) integer overflow

Version:	NetBSD-current:	source prior to October 6, 2006
		NetBSD 3.1:		not affected
		NetBSD 3.0.2:		not affected
		NetBSD 3.0.1:		affected
		NetBSD 3.0:		affected
		NetBSD 2.1:		affected
		NetBSD 2.0.*:		affected
		NetBSD 2.0:		affected

Severity:	Local privilege escalation and denial of service

Fixed:		NetBSD-current:		October 6, 2006
		NetBSD-3-0 branch:	October 16, 2006
		NetBSD-3 branch:	October 16, 2006
		NetBSD-2-1 branch:	November 19, 2006
		NetBSD-2-0 branch:	November 19, 2006
		NetBSD-2 branch:	November 19, 2006


Abstract
========

An integer overflow in systrace(4) can potentially lead to a local
denial of service and/or privilege escalation.

This vulnerability has been assigned CVE reference CVE-2006-5218.


Technical Details
=================

A check for integer overflow is missing in the kernel component of systrace.
The problem is located in the "systrace_preprepl()" function.
The vulnerability can be triggered by passing a large (or negative) integer
value to a systrace ioctl().


Solutions and Workarounds
=========================

A possible solution is to disable systrace by commenting out the 
"options SYSTRACE" line in your kernel configuration file.  You
will need to re-compile and install the new kernel for the change
to become effective on reboot.

For all NetBSD versions, you need to obtain fixed kernel sources,
rebuild and install the new kernel, and reboot the system.
                                      
The fixed source may be obtained from the NetBSD CVS repository.

The following instructions briefly summarise 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 sys/sys/systrace.h \
	 	sys/kern/kern_systrace.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:

   http://www.NetBSD.org/guide/en/chap-kernel.html


Thanks To
=========

Chris Evans is credited with the discovery of this issue.

Revision History
================

	2006-11-27	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 
  ftp://ftp.NetBSD.org/pub/NetBSD/security/advisories/NetBSD-SA2006-024.txt.asc

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


Copyright 2006, The NetBSD Foundation, Inc.  All Rights Reserved.
Redistribution permitted only in full, unmodified form.

$NetBSD: NetBSD-SA2006-024.txt,v 1.3 2006/11/27 20:14:45 adrianp Exp $

- -----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.5 (NetBSD)

iQCVAwUBRWtHZT5Ru2/4N2IFAQJREgQAv2ziIkNkoC71h8UO9FCAgCUzpAhICaOL
EOew/96bisODCRizrgKKGv8nJlv7RYYP2kPtoxkpJOGR1cdz7MBhUXuKha9iGJtc
yOxssieab1ufvr6VA4Y2GZib5yuREqcPLT9/CZ826yjf7fex2Qiaj7dOa+MxAqI3
ip5GTQ7tBow=
=cRJw
- -----END PGP SIGNATURE-----

- --------------------------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:

        http://www.auscert.org.au/render.html?cid=1980

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:

        http://www.auscert.org.au/render.html?it=3192

===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
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.
===========================================================================

-----BEGIN PGP SIGNATURE-----
Comment: http://www.auscert.org.au/render.html?it=1967

iQCVAwUBRWuLBCh9+71yA2DNAQL1hwP/alQmc2/IZSP5S69ON9OS8RzlisL1yc3N
BzwhlFl/z9Xzazi+Jhmbh1swTKZHWpGbHYiJE9RWoGqJs/+lc9ufydrIYwCWxpUz
Jg11E+ESeGP+jNOD4TQTx4IClQ+FXf4m+uPN1mT1l+X56ccQDSB5cP//LBbohQCk
cegV1XOYDG4=
=k0Dv
-----END PGP SIGNATURE-----