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)
116 lines
4.2 KiB
Text
116 lines
4.2 KiB
Text
-----BEGIN PGP SIGNED MESSAGE-----
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Hash: SHA1
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=============================================================================
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FreeBSD-SA-05:19.ipsec Security Advisory
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The FreeBSD Project
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Topic: Incorrect key usage in AES-XCBC-MAC
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Category: core
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Module: netinet6
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Announced: 2005-07-27
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Credits: Yukiyo Akisada, Yokogawa Electric Corporation
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Affects: FreeBSD 5.3, FreeBSD 5.4
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Corrected: 2005-07-27 08:41:44 UTC (RELENG_6, 6.0-BETA2)
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2005-07-27 08:41:56 UTC (RELENG_5, 5.4-STABLE)
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2005-07-27 08:42:16 UTC (RELENG_5_4, 5.4-RELEASE-p6)
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2005-07-27 08:42:38 UTC (RELENG_5_3, 5.3-RELEASE-p20)
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CVE Name: CAN-2005-2359
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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 security protocol for the Internet Protocol networking
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layer. It provides a combination of encryption and authentication of
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system, using several possible cryptography algorithms.
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II. Problem Description
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A programming error in the implementation of the AES-XCBC-MAC algorithm
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for authentication resulted in a constant key being used instead of the
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key specified by the system administrator.
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III. Impact
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If the AES-XCBC-MAC algorithm is used for authentication in the absence
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of any encryption, then an attacker may be able to forge packets which
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appear to originate from a different system and thereby succeed in
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establishing an IPsec session. If access to sensitive information or
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systems is controlled based on the identity of the source system, this
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may result in information disclosure or privilege escalation.
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IV. Workaround
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Do not use the AES-XCBC-MAC algorithm for authentication, or use it
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together with some form of IPsec encryption.
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Systems which do not use IPsec, use other algorithms, or have IPsec
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encryption enabled are unaffected 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 to the RELENG_5_4 or
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RELENG_5_3 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 5.3 and 5.4
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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 ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-05:19/ipsec.patch
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# fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-05:19/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/ah_aesxcbcmac.c 1.1.4.2
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RELENG_5_4
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src/UPDATING 1.342.2.24.2.15
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src/sys/conf/newvers.sh 1.62.2.18.2.11
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src/sys/netinet6/ah_aesxcbcmac.c 1.1.4.1.2.1
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RELENG_5_3
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src/UPDATING 1.342.2.13.2.23
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src/sys/conf/newvers.sh 1.62.2.15.2.25
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src/sys/netinet6/ah_aesxcbcmac.c 1.1.6.1
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RELENG_6
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src/sys/netinet6/ah_aesxcbcmac.c 1.2.2.1
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- -------------------------------------------------------------------------
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VII. References
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http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-2359
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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-05:19.ipsec.asc
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