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Category:   OS (UNIX)  >   NetBSD Vendors:   NetBSD
NetBSD Bug in Processing ICMPv6 MLD Queries Lets Remote Users Deny Service
SecurityTracker Alert ID:  1020822
SecurityTracker URL:  http://securitytracker.com/id/1020822
CVE Reference:   CVE-2008-2464   (Links to External Site)
Date:  Sep 5 2008
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 4.0
Description:   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.

Impact:   A remote user can cause the target system to crash.
Solution:   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:

http://ftp.NetBSD.org/pub/NetBSD/security/advisories/NetBSD-SA2008-011.txt.asc

Vendor URL:  ftp.netbsd.org/pub/NetBSD/security/advisories/NetBSD-SA2008-011.txt.asc (Links to External Site)
Cause:   Input validation error
Underlying OS:  

Message History:   None.


 Source Message Contents

Date:  Thu, 04 Sep 2008 22:52:04 +0100
Subject:  NetBSD Security Advisory 2008-011: ICMPv6 MLD query


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


		 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)


Abstract
========

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.


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

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:

	options INET6

As a temporary workaround recompile the kernel with the above option 
commented out.  The default NetBSD GENERIC kernels 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 -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:    

   http://www.NetBSD.org/guide/en/chap-kernel.html


Thanks To
=========

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.


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

	2008-09-04	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-SA2008-011.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-SA2008-011.txt,v 1.4 2008/09/04 20:32:25 adrianp Exp $

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