SecurityTracker.com
    Home    |    View Topics    |    Search    |    Contact Us    |   

SecurityTracker
Archives


 


Category:   OS (UNIX)  >   NetBSD Vendors:   NetBSD
(NetBSD Issues Fix) KAME IPv6 Stack Can Be Crashed By Remote Users Sending an IPv6 Packet Containing an IPComp Header
SecurityTracker Alert ID:  1019530
SecurityTracker URL:  http://securitytracker.com/id/1019530
CVE Reference:   CVE-2008-0177   (Links to External Site)
Date:  Feb 29 2008
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 2.0, 2.1, 3.0, and 3.1
Description:   A vulnerability was reported in the KAME IPv6 Stack. A remote user can cause denial of service conditions.

A remote user can send an IPv6 packet with an IPComp header to cause the target service to crash.

Shoichi Sakane of the KAME project reported this vulnerability.

The original advisory is available at:

http://www.kb.cert.org/vuls/id/110947

Apple Mac OS X xnu is also affected. A demonstration exploit from mu-b of digit-labs.org is available at:

http://www.digit-labs.org/files/exploits/xnu-ipv6-ipcomp.c

Impact:   A remote user can cause the target system to crash.
Solution:   NetBSD has released a fix. NetBSD kernels compiled with the 'options IPSEC' option are affected.

The NetBSD advisory is available at:

ftp://ftp.NetBSD.org/pub/NetBSD/security/advisories/NetBSD-SA2008-003.txt.asc

Cause:   State error

Message History:   This archive entry is a follow-up to the message listed below.
Feb 7 2008 KAME IPv6 Stack Can Be Crashed By Remote Users Sending an IPv6 Packet Containing an IPComp Header



 Source Message Contents

Subject:  NetBSD Security Advisory 2008-003: IPsec in IPv6 Denial of Service



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


		 NetBSD Security Advisory 2008-003
		 =================================

Topic:		IPsec in IPv6 Denial of Service

Version:	NetBSD-current:		not affected
		NetBSD 4.0:		not affected
		NetBSD 3.1:		affected
		NetBSD 3.0.*:		affected
		NetBSD 3.0:		affected
		NetBSD 2.1:		affected
		NetBSD 2.0.*:		affected
		NetBSD 2.0:		affected

Severity:	Remote denial of service

Fixed:		NetBSD-3-1 branch:	November 22, 2007
			(3.1.2 will include the fix)
		NetBSD-3-0 branch:	November 22, 2007
			(3.0.4 will include the fix)
		NetBSD-3 branch:	November 22, 2007
			(3.2 will include the fix)
		NetBSD-2-1 branch:	December 01, 2007
		NetBSD-2-0 branch:	December 01, 2007
		NetBSD-2 branch:	December 01, 2007


Abstract
========

A remote user can cause the system to panic by sending a crafted IPv6
packet to a system with an IPSEC enabled kernel.

This vulnerability has been assigned VU#110947 by CERT.


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

When processing an IPComp packet over IPv6 with an IPsec enabled kernel
an uninitialised pointer is referenced which results in a system panic.


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

Only kernels compiled with the following option are vulnerable to this issue:

	options IPSEC

As a temporary workaround recompile the kernel with the above option 
commented out.  The default NetBSD GENERIC kernels do not have this
option enabled.

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 sys/netinet6/ipcomp_input.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
=========

Takashi Sogabe of Internet Initiative Japan Inc. for reporting this issue.


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

	2008-02-28	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-SA2008-003.txt.asc

Information about NetBSD and NetBSD security can be found at
http://www.NetBSD.org/ and http://www.NetBSD.org/Security/.


Copyright 2008, The NetBSD Foundation, Inc.  All Rights Reserved.
Redistribution permitted only in full, unmodified form.

$NetBSD: NetBSD-SA2008-003.txt,v 1.3 2008/02/28 19:27:42 adrianp Exp $

-----BEGIN PGP SIGNATURE-----

iQCVAwUBR8cLjT5Ru2/4N2IFAQKAVAQAsVPwJRfpP4nWjptSSyShS2TjAbMkvtNv
6+8dy3PJM8irv/XtQx2b4Dj6VplMdWGgj8PHE3zlblcLTFbF1FxtQ0TES5sBST/T
hxIeoMgdoqGEOIyAV7IpdpB5JdGN9D280x40qYfxgmGNsoYkdFkBUrX3TbBTAw+K
YrfXK12WmFs=
=1SxV
-----END PGP SIGNATURE-----

 
 


Go to the Top of This SecurityTracker Archive Page





Home   |    View Topics   |    Search   |    Contact Us

This web site uses cookies for web analytics. Learn More

Copyright 2021, SecurityGlobal.net LLC