(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
(Links to External Site)
Date: Feb 29 2008
Denial of service via network|
Fix Available: Yes Vendor Confirmed: Yes |
Version(s): 2.0, 2.1, 3.0, and 3.1|
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:
Apple Mac OS X xnu is also affected. A demonstration exploit from mu-b of digit-labs.org is available at:
A remote user can cause the target system to crash.|
NetBSD has released a fix. NetBSD kernels compiled with the 'options IPSEC' option are affected.|
The NetBSD advisory is available at:
This archive entry is a follow-up to the message listed below.|
Source Message Contents
Subject: NetBSD Security Advisory 2008-003: IPsec in IPv6 Denial of Service|
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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
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.
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:
As a temporary workaround recompile the kernel with the above option
commented out. The default NetBSD GENERIC kernels do not have this
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:
Takashi Sogabe of Internet Initiative Japan Inc. for reporting this issue.
2008-02-28 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 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 $
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