Subject: NetBSD Security Advisory 2006-012: SIOCGIFALIAS ioctl may cause system crash
To: None <netbsd-announce@NetBSD.org>
From: NetBSD Security-Officer <security-officer@NetBSD.org>
Date: 04/13/2006 03:34:08
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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
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.
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:
Sean Boudreau for PoC code and implementing the fixes.
2006-04-12 Initial release
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 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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