3571e53040
patches for easier mirroring, to eliminate a special copy, to make www.freebsd.org/security a full copy of security.freebsd.org and be eventually be the same. For now files are just sitting there. The symlinks are missing. Discussed on: www (repository location) Discussed with: simon (so)
110 lines
3.8 KiB
Text
110 lines
3.8 KiB
Text
-----BEGIN PGP SIGNED MESSAGE-----
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Hash: SHA1
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=============================================================================
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FreeBSD-EN-07:02.net Errata Notice
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The FreeBSD Project
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Topic: IPv6 over Point-to-Point gif(4) tunnels
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Category: core
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Module: sys_netinet6
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Announced: 2007-02-28
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Credits: Bruce A. Mah
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Affects: FreeBSD 6.2-RELEASE
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Corrected: 2007-02-08 22:52:56 UTC (RELENG_6, 6.2-STABLE)
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2007-02-28 18:24:37 UTC (RELENG_6_2, 6.2-RELEASE-p2)
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For general information regarding FreeBSD Errata Notices and Security
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Advisories, including descriptions of the fields above, security
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branches, and the following sections, please visit
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<URL:http://security.FreeBSD.org/>.
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I. Background
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The FreeBSD kernel provides basic networking services, including
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(among other protocols) the IPv6 network protocol stack.
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The gif(4) tunnel driver provides a generic tunnelling interface,
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which is commonly used to carry IPv6 packets across an IPv4 internetwork.
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II. Problem Description
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FreeBSD 6.2-RELEASE contains a regression in the behavior of IPv6
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over gif(4) tunnels configured as point-to-point interfaces (in
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other words, gif(4) interfaces with an explicitly-configured destination
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address and a 128-bit prefix length). When such an interface is
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configured, a route to the destination address must be added implicitly
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by the kernel to allow packets to traverse the tunnel properly.
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FreeBSD 6.2-RELEASE does not do this.
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III. Impact
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In some cases, it may be impossible for a host to send IPv6 traffic over a
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gif(4) tunnel interface due to the lack of an appropriate routing table
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entry.
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IV. Workaround
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One workaround is to add a route to the destination address explicitly
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using the route(8) command, as in the following example:
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# route add -host -inet6 ADDRESS -interface GIF -nostatic -llinfo
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In the command line above, ADDRESS and GIF should be replaced by the
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destination IPv6 address and the interface name of the gif(4) tunnel,
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respectively.
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In some cases, the host route to the destination may be added implicitly
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as a side-effect of receiving inbound packets over the tunnel.
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V. Solution
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Perform one of the following:
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1) Upgrade your affected system to 6-STABLE or to the RELENG_6_2
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security branch dated after the correction date.
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2) To patch your present system:
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The following patches have been verified to apply to FreeBSD 6.2
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systems.
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a) Download the relevant patch from the location below, and verify the
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detached PGP signature using your PGP utility.
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# fetch http://security.FreeBSD.org/patches/EN-07:02/net.patch
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# fetch http://security.FreeBSD.org/patches/EN-07:02/net.patch.asc
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b) Apply the patch.
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# cd /usr/src
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# patch < /path/to/patch
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c) Recompile your kernel as described in
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<URL:http://www.freebsd.org/handbook/kernelconfig.html> and reboot the
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system.
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VI. Correction details
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The following list contains the revision numbers of each file that was
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corrected in FreeBSD.
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Branch Revision
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Path
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- ----------------------------------------------------------------------------
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RELENG_6_2
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src/UPDATING 1.416.2.29.2.5
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src/sys/conf/newvers.sh 1.69.2.13.2.5
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src/sys/netinet6/nd6.c 1.48.2.15.2.1
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- ----------------------------------------------------------------------------
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The latest revision of this Errata Notice is available at
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http://security.FreeBSD.org/advisories/FreeBSD-EN-07:02.net.asc
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