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Home » Security Advisories» NetBSD » Local user system crash

Local user system crash

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.

  • Vendor: NetBSD
  • Vendor ID: 2006-012
  • Date: April 12, 2006


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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-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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