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)
112 lines
3.7 KiB
Text
112 lines
3.7 KiB
Text
-----BEGIN PGP SIGNED MESSAGE-----
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Hash: SHA1
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=============================================================================
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FreeBSD-EN-06:02.net Errata Notice
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The FreeBSD Project
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Topic: Networking Issues
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Category: core
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Module: sys
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Announced: 2006-08-28
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Credits: Robert Watson, JINMEI Tatuya
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Affects: FreeBSD 6.1-RELEASE
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Corrected: 2006-08-28 07:31:11 UTC (RELENG_6_1, 6.1-RELEASE-p5)
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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, supporting the
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IPv4 and IPv6 network protocols.
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II. Problem Description
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Several issues have been discovered in the networking code in the
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FreeBSD 6.1 kernel. Specifically:
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1. A pointer was not being checked for validity before being
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dereferenced.
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2. Some statistics-keeping code in the UMA memory allocator
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erroneously counted certain types of successful memory allocations
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as failures.
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3. IPv6 neighbor discovery did not work correctly over point-to-point
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links.
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III. Impact
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The impacts of these bugs are varied.
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1. The pointer dereferencing issue could cause a kernel panic.
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2. The memory statistics-keeping error could cause the kernel to
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report an incorrect number of memory allocations that failed.
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One symptom of this problem is a artificially high count of
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"requests for mbufs denied" in the output from "netstat -m".
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3. The IPv6 neighbor discovery bug could cause spurious warnings to
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be generated when running IPv6 over point-to-point links. This
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problem was particularly noticeable over gif(4) tunnels.
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IV. Workaround
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No workaround is available.
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V. Solution
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Perform one of the following:
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1) Upgrade your vulnerable system to 6-STABLE, or to the RELENG_6_1
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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 patch has been verified to apply to FreeBSD 6.1 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-06:02/net.patch
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# fetch http://security.FreeBSD.org/patches/EN-06:02/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_1
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src/UPDATING 1.416.2.22.2.7
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src/sys/conf/newvers.sh 1.69.2.11.2.7
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src/sys/netinet/ip_output.c 1.242.2.8.2.1
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src/sys/netinet6/in6.c 1.51.2.8.2.1
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src/sys/netinet6/nd6.c 1.48.2.12.2.1
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src/sys/vm/uma_core.c 1.119.2.15.2.1
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- -------------------------------------------------------------------------
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The latest revision of this advisory is available at
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http://security.FreeBSD.org/advisories/FreeBSD-EN-06:02.net.asc
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