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)
134 lines
5.3 KiB
Text
134 lines
5.3 KiB
Text
-----BEGIN PGP SIGNED MESSAGE-----
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Hash: SHA1
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=============================================================================
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FreeBSD-SA-06:11.ipsec Security Advisory
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The FreeBSD Project
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Topic: IPsec replay attack vulnerability
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Category: core
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Module: sys_netipsec
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Announced: 2006-03-22
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Credits: Pawel Jakub Dawidek
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Affects: All FreeBSD releases since 4.8-RELEASE
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Corrected: 2006-03-22 16:01:08 UTC (RELENG_6, 6.1-STABLE)
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2006-03-22 16:01:38 UTC (RELENG_6_0, 6.0-RELEASE-p6)
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2006-03-22 16:01:56 UTC (RELENG_5, 5.5-STABLE)
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2006-03-22 16:02:17 UTC (RELENG_5_4, 5.4-RELEASE-p13)
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2006-03-22 16:02:35 UTC (RELENG_5_3, 5.3-RELEASE-p28)
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2006-03-22 16:02:49 UTC (RELENG_4, 4.11-STABLE)
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2006-03-22 16:03:05 UTC (RELENG_4_11, 4.11-RELEASE-p16)
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2006-03-22 16:03:25 UTC (RELENG_4_10, 4.10-RELEASE-p22)
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CVE Name: CVE-2006-0905
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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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IPsec is a set of protocols, including ESP (Encapsulating Security Payload)
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and AH (Authentication Header), that provide security services for IP
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datagrams. ESP protects IP payloads from wire-tapping by encrypting them
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using secret key cryptography algorithms. AH guarantees the integrity of IP
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packets and protects them from intermediate alteration or impersonation by
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attaching a cryptographic checksum computed using one-way hash functions.
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II. Problem Description
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IPsec provides an anti-replay service which when enabled prevents an attacker
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from successfully executing a replay attack. This is done through the
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verification of sequence numbers. A programming error in the fast_ipsec(4)
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implementation results in the sequence number associated with a Security
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Association not being updated, allowing packets to unconditionally pass
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sequence number verification checks.
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III. Impact
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An attacker able to to intercept IPSec packets can replay them. If higher
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level protocols which do not provide any protection against packet replays
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(e.g., UDP) are used, this may have a variety of effects.
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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 4-STABLE, 5-STABLE, or 6-STABLE,
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or to the RELENG_6_0, RELENG_5_4, RELENG_5_3, RELENG_4_11, or
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RELENG_4_10 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 4.10,
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4.11, 5.3, 5.4, 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-06:11/ipsec.patch
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# fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-06:11/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_4
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src/sys/netipsec/xform_esp.c 1.2.2.4
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RELENG_4_11
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src/UPDATING 1.73.2.91.2.17
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src/sys/conf/newvers.sh 1.44.2.39.2.20
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src/sys/netipsec/xform_esp.c 1.2.2.3.6.1
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RELENG_4_10
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src/UPDATING 1.73.2.90.2.23
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src/sys/conf/newvers.sh 1.33.2.34.2.24
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src/sys/netipsec/xform_esp.c 1.2.2.3.4.1
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RELENG_5
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src/sys/netipsec/xform_esp.c 1.9.2.2
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RELENG_5_4
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src/UPDATING 1.342.2.24.2.22
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src/sys/conf/newvers.sh 1.62.2.18.2.18
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src/sys/netipsec/xform_esp.c 1.9.2.1.2.1
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RELENG_5_3
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src/UPDATING 1.342.2.13.2.31
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src/sys/conf/newvers.sh 1.62.2.15.2.33
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src/sys/netipsec/xform_esp.c 1.9.4.1
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RELENG_6
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src/sys/netipsec/xform_esp.c 1.10.2.1
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RELENG_6_0
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src/UPDATING 1.416.2.3.2.11
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src/sys/conf/newvers.sh 1.69.2.8.2.7
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src/sys/netipsec/xform_esp.c 1.10.4.1
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- -------------------------------------------------------------------------
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VII. References
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http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-0905
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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-06:11.ipsec.asc
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