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		 NetBSD Security Advisory 2003-010

		 =================================
Topic:		remote panic in OSI networking code
Version:	NetBSD-current:	source prior to May 26, 2003

		NetBSD 1.6.1:	affected

		NetBSD 1.6:	affected

		NetBSD-1.5.3:	affected

		NetBSD-1.5.2:	affected

		NetBSD-1.5.1:	affected

		NetBSD-1.5:	affected
Severity:	remote system crash possible on OSI connected systems
Fixed:		NetBSD-current:		May 26, 2003

		NetBSD-1.6 branch:	May 26, 2003 (1.6.2 will include the fix)

		NetBSD-1.5 branch:	May 28, 2003
Abstract

========
It is possible to crash an OSI connected system remotely by sending it

a carefully prepared OSI networking packet.
Technical Details

=================
The OSI networking kernel (sys/netiso) contains a function that sends

error indications to the sender of an OSI packet in certain error

conditions.  This function prepares its own packet header mbuf, but was

never converted to use a "PKTHDR" mbuf as has been required by the

BSD networking stack for a long time.
Networking drivers sending a packet prepared in this way will either

panic complaining about this condition (if the kernel was compiled

with "options DEBUG") or crash in erratic ways (if they try to use

the invalid information in a header mbuf not containing the pkthdr

fields).
Solutions and Workarounds

=========================
How to determine if your system is vulnerable:
OSI is not a commonly used network stack, and most NetBSD users will not

be affected by this advisory. If 'ifconfig -a | grep iso' does not show

iso addresses assigned on any interface, the system is not vulnerable.
Any system with the abovementioned kernel date that has OSI addresses

configured is vulnerable.
Workaround: don't configure OSI addresses onto your system, or disable

any OSI addresses configured, or configure and boot a kernel without

``options OSI''.  This will disable any OSI communications.
The following instructions describe how to upgrade your kernel

binaries by updating your source tree and rebuilding and

installing a new version of the kernel.
* NetBSD-current:
	Systems running NetBSD-current dated from before 2003-05-25

	should be upgraded to NetBSD-current dated 2003-05-26 or later.
	The following file needs to be updated from the

	netbsd-current CVS branch (aka HEAD):

		sys/netiso/clnp_er.c
	To update from CVS, re-build, and install your kernel, and reboot
		% cd src

		% cvs update -d -P sys/netiso
		% cd sys/arch/ARCH/conf

		% config KERNCONFFILE

		% cd ../compile/KERNCONFFILE

		% make clean depend;make
		% su

		# cp netbsd /

		# reboot
* NetBSD 1.6, 1.6.1:
	The binary distribution of NetBSD 1.6.1 is vulnerable.
	Systems running NetBSD 1.6 sources dated from before

	2003-05-25 should be upgraded from NetBSD 1.6 sources dated

	2003-05-26 or later.
	NetBSD 1.6.2 will include the fix.
	The following file needs to be updated from the

	netbsd-1-6 CVS branch:

		sys/netiso/clnp_er.c
	To update from CVS, re-build, and install a patched kernel:
		% cd src

		% cvs update -d -P -r netbsd-1-6 sys/netiso
		% cd sys/arch/ARCH/conf

		% config KERNCONFFILE

		% cd ../compile/KERNCONFFILE

		% make clean depend;make
		% su

		# cp netbsd /

		# reboot
	Alternatively, apply the following patch (with potential offset

	differences):

		ftp://ftp.NetBSD.org/pub/NetBSD/security/patches/SA2003-010-osi.patch
	To patch, re-build and install the kernel, then reboot:
		# cd src

		# patch < /path/to/SA2003-010-osi.patch
		% cd sys/arch/ARCH/conf

		% config KERNCONFFILE

		% cd ../compile/KERNCONFFILE

		% make clean depend;make
		% su

		# cp netbsd /

		# reboot
* NetBSD 1.5, 1.5.1, 1.5.2, 1.5.3:
	The binary distribution of NetBSD 1.5.3 is vulnerable.
	Systems running NetBSD 1.5, 1.5.1, 1.5.2, or 1.5.3 sources dated

	from before 2003-05-27 should be upgraded from NetBSD 1.5.*

	sources dated 2003-05-28 or later.
	The following files need to be updated from the

	netbsd-1-5 CVS branch:

		sys/netiso/clnp_er.c
	To update from CVS, re-build, and install a patched kernel:
		% cd src

		% cvs update -d -P -r netbsd-1-5 sys/netiso
		% cd sys/arch/ARCH/conf

		% config KERNCONFFILE

		% cd ../compile/KERNCONFFILE

		% make clean depend;make
		% su

		# cp netbsd /

		# reboot
	Alternatively, apply the following patch (with potential offset

	differences):

		ftp://ftp.NetBSD.org/pub/NetBSD/security/patches/SA2003-010-osi.patch
	To patch, re-build and install the kernel, then reboot:
		# cd src

		# patch < /path/to/SA2003-010-osi.patch
		% cd sys/arch/ARCH/conf

		% config KERNCONFFILE

		% cd ../compile/KERNCONFFILE

		% make clean depend;make
		% su

		# cp netbsd /

		# reboot
Thanks To

=========
Ignatios Souvatzis
Revision History

================
	2003-08-04	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-SA2003-010.tx...
Information about NetBSD and NetBSD security can be found at

http://www.NetBSD.org/ and http://www.NetBSD.org/Security/.
Copyright 2003, The NetBSD Foundation, Inc.  All Rights Reserved.

Redistribution permitted only in full, unmodified form.
$NetBSD: NetBSD-SA2003-010.txt,v 1.8 2003/08/04 16:02:47 david Exp $
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