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)
165 lines
6.9 KiB
Text
165 lines
6.9 KiB
Text
-----BEGIN PGP SIGNED MESSAGE-----
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Hash: SHA1
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=============================================================================
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FreeBSD-SA-05:21.openssl Security Advisory
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The FreeBSD Project
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Topic: Potential SSL 2.0 rollback
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Category: contrib
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Module: openssl
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Announced: 2005-10-11
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Credits: Yutaka Oiwa
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Affects: All FreeBSD releases.
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Corrected: 2005-10-11 11:52:46 UTC (RELENG_6, 6.0-STABLE)
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2005-10-11 11:53:03 UTC (RELENG_6_0, 6.0-RELEASE)
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2005-10-11 11:52:01 UTC (RELENG_5, 5.4-STABLE)
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2005-10-11 11:52:28 UTC (RELENG_5_4, 5.4-RELEASE-p8)
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2005-10-11 11:52:13 UTC (RELENG_5_3, 5.3-RELEASE-p23)
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2005-10-11 11:50:50 UTC (RELENG_4, 4.11-STABLE)
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2005-10-11 11:51:45 UTC (RELENG_4_11, 4.11-RELEASE-p13)
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2005-10-11 11:51:20 UTC (RELENG_4_10, 4.10-RELEASE-p19)
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CVE Name: CAN-2005-2969
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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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The OpenSSL library implements the Secure Sockets Layer and Transport
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Layer Security protocols, as well as providing a large number of basic
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cryptographic functions.
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The Secure Sockets Layer protocol exists in two versions and includes a
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mechanism for negotiating the protocol version to be used. If the
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protocol is executed correctly, it is impossible for a client and
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server both capable of the newer version of the protocol (SSLv3) to end
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up using the older version of the protocol (SSLv2).
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II. Problem Description
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In order to provide bug-for-bug compatibility with Microsoft Internet
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Explorer 3.02, a verification step required by the Secure Sockets Layer
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protocol can be disabled by using the SSL_OP_MSIE_SSLV2_RSA_PADDING
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option in OpenSSL. This option is implied by the frequently-used
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SSL_OP_ALL option.
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III. Impact
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If the SSL_OP_MSIE_SSLV2_RSA_PADDING option is enabled in a server
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application using OpenSSL, an attacker who is able to intercept and
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tamper with packets transmitted between a client and the server can
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cause the protocol version negotiation to result in SSLv2 being used
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even when both the client and the server support SSLv3. Due to a
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number of weaknesses in the SSLv2 protocol, this may allow the attacker
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to read or tamper with the encrypted data being sent.
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Applications which do not support SSLv2, have been configured to not
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permit the use of SSLv2, or do not use the SSL_OP_MSIE_SSLV2_RSA_PADDING
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or SSL_OP_ALL options are not affected.
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IV. Workaround
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No workaround is available.
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V. Solution
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NOTE WELL: The solution described below causes OpenSSL to ignore the
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SSL_OP_MSIE_SSLV2_RSA_PADDING option and hence to require conformance
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with the Secure Sockets Layer protocol. As a result, this solution
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will reintroduce incompatibility with Microsoft Internet Explorer 3.02
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and any other applications which exhibit the same protocol violation.
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Perform one of the following:
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1) Upgrade your vulnerable system to 4-STABLE or 5-STABLE, or to the
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RELENG_5_4, RELENG_5_3, RELENG_4_11, or RELENG_4_10 security branch
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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, and 5.4 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-05:21/openssl.patch
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# fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-05:21/openssl.patch.asc
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b) Execute the following commands as root:
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# cd /usr/src
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# patch < /path/to/patch
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c) Recompile the operating system as described in
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<URL: http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/makeworld.html >.
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Note that any statically linked applications that are not part of the
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base system (i.e. from the Ports Collection or other 3rd-party sources)
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must be recompiled.
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All affected applications must be restarted for them to use the
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corrected library. Though not required, rebooting may be the easiest
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way to accomplish this.
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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/crypto/openssl/crypto/opensslv.h 1.1.1.1.2.11
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src/crypto/openssl/ssl/s23_srvr.c 1.2.2.6
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RELENG_4_11
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src/UPDATING 1.73.2.91.2.14
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src/sys/conf/newvers.sh 1.44.2.39.2.17
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src/crypto/openssl/crypto/opensslv.h 1.1.1.1.2.10.4.1
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src/crypto/openssl/ssl/s23_srvr.c 1.2.2.5.8.1
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RELENG_4_10
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src/UPDATING 1.73.2.90.2.20
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src/sys/conf/newvers.sh 1.44.2.34.2.21
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src/crypto/openssl/crypto/opensslv.h 1.1.1.1.2.10.2.1
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src/crypto/openssl/ssl/s23_srvr.c 1.2.2.5.6.1
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RELENG_5
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src/crypto/openssl/crypto/opensslv.h 1.1.1.1.15.2.2
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src/crypto/openssl/ssl/s23_srvr.c 1.7.6.1
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RELENG_5_4
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src/UPDATING 1.342.2.24.2.17
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src/sys/conf/newvers.sh 1.62.2.18.2.13
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src/crypto/openssl/crypto/opensslv.h 1.1.1.15.2.1.2.1
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src/crypto/openssl/ssl/s23_srvr.c 1.7.10.1
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RELENG_5_3
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src/UPDATING 1.342.2.13.2.26
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src/sys/conf/newvers.sh 1.62.2.15.2.28
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src/crypto/openssl/crypto/opensslv.h 1.1.1.15.4.1
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src/crypto/openssl/ssl/s23_srvr.c 1.7.8.1
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RELENG_6
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src/crypto/openssl/ssl/s23_srvr.c 1.7.12.1
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src/crypto/openssl/crypto/opensslv.h 1.1.1.16.2.1
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RELENG_6_0
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src/UPDATING 1.416.2.3.2.1
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src/crypto/openssl/crypto/opensslv.h 1.1.1.16.4.1
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src/crypto/openssl/ssl/s23_srvr.c 1.7.14.1
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- -------------------------------------------------------------------------
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VII. References
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http://www.openssl.org/news/secadv_20051011.txt
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http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-2969
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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-05:21.openssl.asc
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-----BEGIN PGP SIGNATURE-----
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Version: GnuPG v1.4.2 (FreeBSD)
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-----END PGP SIGNATURE-----
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