NetBSD Bug in Processing ICMPv6 MLD Queries Lets Remote Users Deny Service
SecurityTracker Alert ID: 1020822|
SecurityTracker URL: http://securitytracker.com/id/1020822
(Links to External Site)
Date: Sep 5 2008
Denial of service via network|
Fix Available: Yes Vendor Confirmed: Yes |
A vulnerability was reported in NetBSD. A remote user can cause denial of service conditions.|
A remote user can send an ICMPv6 MLD query with a specially crafted Maximum Response Delay value to trigger a system panic.
Systems compiled with the 'options INET6' option are affected.
Miikka Saukko, Ossi Herrala, and Jukka Taimisto from the CROSS project at Codenomicon Ltd. reported this vulnerability.
A remote user can cause the target system to crash.|
The vendor has issued a source code fix.|
The fix will be included in the future 4.0.1 and 4.1 versions.
The vendor's advisory is available at:
Vendor URL: ftp.netbsd.org/pub/NetBSD/security/advisories/NetBSD-SA2008-011.txt.asc (Links to External Site)
Input validation error|
Source Message Contents
Subject: NetBSD Security Advisory 2008-011: ICMPv6 MLD query|
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NetBSD Security Advisory 2008-011
Topic: ICMPv6 MLD query
Version: NetBSD-current: affected
NetBSD 4.0: affected
NetBSD 3.1.*: not affected
NetBSD 3.1: not affected
NetBSD 3.0.*: not affected
NetBSD 3.0: not affected
Severity: Denial of service
Fixed: NetBSD-current: August 22, 2008
NetBSD-4-0 branch: August 23, 2008
(4.0.1 will include the fix)
NetBSD-4 branch: August 23, 2008
(4.1 will include the fix)
A malformed ICMPv6 MLD (RFC 2710) query directed at a NetBSD host can
result in a denial of service (system panic).
This vulnerability has been assigned CVE-2008-2464.
An error occurs when processing an MLD packet with certain values
in the Maximum Response Delay field.
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 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 -d -P sys/netinet6/mld6.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:
Matt Thomas for the fix and CERT-FI for co-ordination of the issue.
Miikka Saukko, Ossi Herrala and Jukka Taimisto from the CROSS project
at Codenomicon Ltd. are credited with discovering this issue and providing
an initial fix.
2008-09-04 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-SA2008-011.txt,v 1.4 2008/09/04 20:32:25 adrianp Exp $
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