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)
104 lines
3.5 KiB
Text
104 lines
3.5 KiB
Text
-----BEGIN PGP SIGNED MESSAGE-----
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Hash: SHA1
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=============================================================================
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FreeBSD-SA-08:04.ipsec Security Advisory
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The FreeBSD Project
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Topic: IPsec null pointer dereference panic
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Category: core
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Module: ipsec
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Announced: 2008-02-14
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Credits: Takashi Sogabe, Tatuya Jinmei
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Affects: FreeBSD 5.5
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Corrected: 2008-02-14 11:49:39 UTC (RELENG_5, 5.5-STABLE)
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2008-02-14 11:50:28 UTC (RELENG_5_5, 5.5-RELEASE-p19)
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CVE Name: CVE-2008-0177
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For general information regarding FreeBSD Security Advisories,
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including descriptions of the fields above, security branches, and the
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following sections, please visit <URL:http://security.FreeBSD.org/>.
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I. Background
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The IPsec suite of protocols provide network level security for IPv4
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and IPv6 packets. FreeBSD includes software originally developed by
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the KAME project which implements the various protocols that make up
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IPsec.
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II. Problem Description
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There is an improper reference to a data structure in the processing of
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IPsec packets, which can result in a NULL pointer being dereferenced.
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III. Impact
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A single specifically crafted IPv6 packet could cause the kernel to panic,
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when the kernel had been configured to process IPsec and IPv6 traffic.
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This requires IPSEC to be compiled into the kernel, it does not necessarily
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have to be configured at that point.
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IV. Workaround
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No workaround is available, but kernels which does not include IPsec
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support are not vulnerable. The GENERIC and SMP kernel configurations
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distributed with FreeBSD releases do not include IPsec support.
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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 5-STABLE, or to the RELENG_5_5
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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 5.5 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/SA-08:04/ipsec.patch
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# fetch http://security.FreeBSD.org/patches/SA-08:04/ipsec.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_5
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src/sys/netinet6/ipcomp_input.c 1.7.4.2
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RELENG_5_5
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src/UPDATING 1.342.2.35.2.20
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src/sys/conf/newvers.sh 1.62.2.21.2.21
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src/sys/netinet6/ipcomp_input.c 1.7.4.1.4.1
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- -------------------------------------------------------------------------
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VII. References
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http://www.kb.cert.org/vuls/id/110947
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http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-0177
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The latest revision of this advisory is available at
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http://security.FreeBSD.org/advisories/FreeBSD-SA-08:04.ipsec.asc
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