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Category:   OS (UNIX)  >   NetBSD Vendors:   NetBSD
NetBSD SIOCGIFALIAS ioctl Error Lets Local Users Deny Service
SecurityTracker Alert ID:  1015908
SecurityTracker URL:  http://securitytracker.com/id/1015908
CVE Reference:   CVE-2006-1797   (Links to External Site)
Updated:  Nov 27 2009
Original Entry Date:  Apr 13 2006
Impact:   Denial of service via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 1.6, 2.0, 2.1, 3.0
Description:   A vulnerability was reported in NetBSD. A local user can cause denial of service conditions.

A local user can attempt to gather information on a non-existent alias of a network interface via the SIOCGIFALIAS ioctl to trigger a NULL dereference and cause the target system to crash.

The vendor credits Sean Boudreau with reporting this vulnerability.

Impact:   A local user can cause denial of service conditions on the target system.
Solution:   The vendor has issued the following solution information [quoted]:

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 -d -P sys/netinet/in.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

The vendor's advisory is available at:

ftp://ftp.NetBSD.org/pub/NetBSD/security/advisories/NetBSD-SA2006-012.txt.asc

Vendor URL:  www.NetBSD.org/Security/ (Links to External Site)
Cause:   Boundary error, State error

Message History:   None.


 Source Message Contents

Subject:  NetBSD Security Advisory 2006-012: SIOCGIFALIAS ioctl may cause system

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


		 NetBSD Security Advisory 2006-012
		 =================================

Topic:		SIOCGIFALIAS ioctl may cause system crash

Version:	NetBSD-current:	source prior to September 28, 2005
		NetBSD 3.0:	affected
		NetBSD 2.1:     affected
		NetBSD 2.0.*:   affected
		NetBSD 2.0:     affected
		NetBSD 1.6.*:   affected
		NetBSD 1.6:     affected

Severity:	Any local user can crash the system

Fixed:		NetBSD-current:		September 28, 2005
		NetBSD-3-0 branch:	April 02, 2006
						(3.0.1 will include the fix)
		NetBSD-3   branch:	April 02, 2006
		NetBSD-2-1 branch:	April 02, 2006
						(2.1.1 will include the fix)
		NetBSD-2-0 branch:	April 02, 2006
						(2.0.4 will include the fix)
		NetBSD-2 branch:	April 02, 2006
		NetBSD-1-6 branch:	April 02, 2006

Abstract
========

A system crash can occur if a user attempts to gather information on a
non-existent alias of a network interface via the SIOCGIFALIAS ioctl.

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

A NULL dereference occurs in the kernel when the alias in question
was not located, rather than returning an error.  A socket on the
local machine is required.

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

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 -d -P sys/netinet/in.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
=========

Sean Boudreau for PoC code and implementing the fixes.

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

	2006-04-12	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-SA2006-012.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-SA2006-012.txt,v 1.6 2006/04/12 22:09:50 adrianp Exp $

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