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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-S
A2006-012.txt.asc
Information about NetBSD and NetBSD security can be found at
http://www.NetBSD.org/
and http://www.NetBSD.or
g/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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