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)
120 lines
4.3 KiB
Text
120 lines
4.3 KiB
Text
-----BEGIN PGP SIGNED MESSAGE-----
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Hash: SHA1
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=============================================================================
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FreeBSD-SA-06:07.pf Security Advisory
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The FreeBSD Project
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Topic: IP fragment handling panic in pf(4)
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Category: contrib
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Module: sys_contrib
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Announced: 2006-01-25
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Credits: Jakob Schlyter, Daniel Hartmeier
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Affects: FreeBSD 5.3, FreeBSD 5.4, and FreeBSD 6.0
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Corrected: 2006-01-25 10:00:59 UTC (RELENG_6, 6.0-STABLE)
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2006-01-25 10:01:26 UTC (RELENG_6_0, 6.0-RELEASE-p4)
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2006-01-25 10:01:47 UTC (RELENG_5, 5.4-STABLE)
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2006-01-25 10:02:07 UTC (RELENG_5_4, 5.4-RELEASE-p10)
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2006-01-25 10:02:27 UTC (RELENG_5_3, 5.3-RELEASE-p25)
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CVE Name: CVE-2006-0381
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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
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<URL:http://www.freebsd.org/security/>.
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I. Background
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pf is an Internet Protocol packet filter originally written for OpenBSD.
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In addition to filtering packets, it also has packet normalization
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capabilities.
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II. Problem Description
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A logic bug in pf's IP fragment cache may result in a packet fragment
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being inserted twice, violating a kernel invariant.
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III. Impact
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By sending carefully crafted sequence of IP packet fragments, a remote
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attacker can cause a system running pf with a ruleset containing a
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'scrub fragment crop' or 'scrub fragment drop-ovl' rule to crash.
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IV. Workaround
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Do not use 'scrub fragment crop' or 'scrub fragment drop-ovl' rules
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on systems running pf. In most cases, such rules can be replaced by
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'scrub fragment reassemble' rules; see the pf.conf(5) manual page for
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more details.
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Systems which do not use pf, or use pf but do not use the aforementioned
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rules, are not affected by this issue.
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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 6-STABLE, or to the
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RELENG_6_0, RELENG_5_4, or RELENG_5_3 security branch dated after the
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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 5.3, 5.4,
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and 6.0 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 ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-06:07/pf.patch
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# fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-06:07/pf.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/contrib/pf/net/pf_norm.c 1.10.2.2
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RELENG_5_4
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src/UPDATING 1.342.2.24.2.19
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src/sys/conf/newvers.sh 1.62.2.18.2.15
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src/sys/contrib/pf/net/pf_norm.c 1.10.6.1
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RELENG_5_3
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src/UPDATING 1.342.2.13.2.28
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src/sys/conf/newvers.sh 1.62.2.15.2.30
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src/sys/contrib/pf/net/pf_norm.c 1.10.4.1
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RELENG_6
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src/sys/contrib/pf/net/pf_norm.c 1.11.2.3
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RELENG_6_0
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src/UPDATING 1.416.2.3.2.9
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src/sys/conf/newvers.sh 1.69.2.8.2.5
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src/sys/contrib/pf/net/pf_norm.c 1.11.2.1.2.1
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- -------------------------------------------------------------------------
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VII. References
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http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-0381
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The latest revision of this advisory is available at
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ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-06:07.pf.asc
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