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Category:   Networking Stack (TCP/IP)  >   OpenBSD Kernel Vendors:   OpenBSD
BSD IPv6 Type 0 Route Headers May Let Remote Users Deny Service
SecurityTracker Alert ID:  1017949
SecurityTracker URL:  http://securitytracker.com/id/1017949
CVE Reference:   CVE-2007-2242   (Links to External Site)
Updated:  Apr 27 2007
Original Entry Date:  Apr 23 2007
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 3.9, 4.0
Description:   A vulnerability was reported in IPv6, affecting OpenBSD and FreeBSD. A remote user can cause denial of service conditions.

A remote user can use IPv6 Type 0 route headers to conduct denial of service attacks against hosts and networks.

[Editor's note: The vendor indicates that this a design flaw in IPv6 and not a flaw in OpenBSD.]

Impact:   A remote user can cause denial of service conditions.
Solution:   OpenBSD has issued the following patches to provide protection against IPv6 Type 0 route header attacks:

ftp://ftp.openbsd.org/pub/OpenBSD/patches/3.9/common/022_route6.patch
ftp://ftp.openbsd.org/pub/OpenBSD/patches/4.0/common/012_route6.patch

[Editor's note: A fix is also available for FreeBSD. A separate Alert will be issued covering the FreeBSD advisory.]

Vendor URL:  www.openbsd.org/ (Links to External Site)
Cause:   Resource error
Underlying OS:  

Message History:   This archive entry has one or more follow-up message(s) listed below.
Apr 27 2007 (FreeBSD Issues Fix) BSD IPv6 Type 0 Route Headers May Let Remote Users Deny Service   (FreeBSD Security Advisories <security-advisories@freebsd.org>)
FreeBSD has released a fix.
May 16 2007 (Red Hat Issues Fix) BSD IPv6 Type 0 Route Headers May Let Remote Users Deny Service   (bugzilla@redhat.com)
Red Hat has released a fix for the Red Hat Enterprise Linux 5.
Jun 20 2007 (Apple Issues Fix for Mac OS X) BSD IPv6 Type 0 Route Headers May Let Remote Users Deny Service   (Apple Product Security <product-security-noreply@lists.apple.com>)
Apple has released a fix for Mac OS X.
Aug 29 2007 (Apple Issues Fix for AirPort Extreme) BSD IPv6 Type 0 Route Headers May Let Remote Users Deny Service   (Apple Product Security <product-security-noreply@lists.apple.com>)
Apple has issued a fix for AirPort Extreme 802.11n base stations.
Sep 14 2007 (NetBSD Issues Fix) BSD IPv6 Type 0 Route Headers May Let Remote Users Deny Service   (NetBSD Security-Officer <security-officer@NetBSD.org>)
NetBSD has released a fix.



 Source Message Contents

Date:  Mon, 23 Apr 2007 11:19:26 -0400
Subject:  OpenBSD


SECURITY FIX: April 23, 2007   All architectures
IPv6 type 0 route headers can be used to mount a DoS attack against hosts and networks. 
This is a design flaw in IPv6 and not a bug in OpenBSD.

A source code patch exists which remedies this problem.

ftp://ftp.openbsd.org/pub/OpenBSD/patches/3.9/common/022_route6.patch
ftp://ftp.openbsd.org/pub/OpenBSD/patches/4.0/common/012_route6.patch
 
 


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