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FreeBSD-SA-06:23.openssl Security Advisory
The FreeBSD Project
Topic: Multiple problems in crypto(3)
Category: contrib
Module: openssl
Announced: 2006-09-28
Credits: Dr S N Henson, Tavis Ormandy, Will Drewry
Stephen Kiernan (Juniper SIRT)
Affects: All FreeBSD releases.
Corrected: 2006-09-29 13:44:03 UTC (RELENG_6, 6.2-PRERELEASE)
2006-09-29 13:44:31 UTC (RELENG_6_1, 6.1-RELEASE-p9)
2006-09-29 13:44:45 UTC (RELENG_6_0, 6.0-RELEASE-p14)
2006-09-29 13:45:01 UTC (RELENG_5, 5.5-STABLE)
2006-09-29 13:45:43 UTC (RELENG_5_5, 5.5-RELEASE-p7)
2006-09-29 13:45:59 UTC (RELENG_5_4, 5.4-RELEASE-p21)
2006-09-29 13:46:10 UTC (RELENG_5_3, 5.3-RELEASE-p36)
2006-09-29 13:46:23 UTC (RELENG_4, 4.11-STABLE)
2006-09-29 13:46:41 UTC (RELENG_4_11, 4.11-RELEASE-p24)
CVE Name: CVE-2006-2937, CVE-2006-2940, CVE-2006-3738, CVE-2006-4343
For general information regarding FreeBSD Security Advisories,
including descriptions of the fields above, security branches, and the
following sections, please visit .
0. Revision History
v1.0 2006-09-28 Initial release.
v1.1 2006-09-29 Corrected patch.
I. Background
FreeBSD includes software from the OpenSSL Project. The OpenSSL Project is
a collaborative effort to develop a robust, commercial-grade, full-featured,
and Open Source toolkit implementing the Secure Sockets Layer (SSL v2/v3)
and Transport Layer Security (TLS v1) protocols as well as a full-strength
general purpose cryptography library.
II. Problem Description
Several problems have been found in OpenSSL:
1. During the parsing of certain invalid ASN1 structures an error condition
is mishandled, possibly resulting in an infinite loop. [CVE-2006-2937]
2. A buffer overflow exists in the SSL_get_shared_ciphers function.
[CVE-2006-3738]
3. A NULL pointer may be dereferenced in the SSL version 2 client code.
[CVE-2006-4343]
In addition, many applications using OpenSSL do not perform any validation
of the lengths of public keys being used. [CVE-2006-2940]
III. Impact
Servers which parse ASN1 data from untrusted sources may be vulnerable to
a denial of service attack. [CVE-2006-2937]
An attacker accessing a server which uses SSL version 2 may be able to
execute arbitrary code with the privileges of that server. [CVE-2006-3738]
A malicious SSL server can cause clients connecting using SSL version 2 to
crash. [CVE-2006-4343]
Applications which perform public key operations using untrusted keys may
be vulnerable to a denial of service attack. [CVE-2006-2940]
IV. Workaround
No workaround is available, but not all of the vulnerabilities mentioned
affect all applications.
V. Solution
Perform one of the following:
1) Upgrade your vulnerable system to 4-STABLE, 5-STABLE, or 6-STABLE,
or to the RELENG_6_1, RELENG_6_0, RELENG_5_5, RELENG_5_4, RELENG_5_3,
or RELENG_4_11 security branch dated after the correction date.
2) To patch your present system:
The following patch has been verified to apply to FreeBSD 4.11, 5.3,
5.4, 5.5, 6.0, and 6.1 systems.
a) Download the patch from the location below, and verify the detached
PGP signature using your PGP utility.
# fetch http://security.FreeBSD.org/patches/SA-06:23/openssl.patch
# fetch http://security.FreeBSD.org/patches/SA-06:23/openssl.patch.asc
NOTE: The patch distributed at the time of the original advisory was
incorrect. Systems to which the original patch was applied should be
patched with the following corrective patch, which contains only the
changes between the original and updated patch:
# fetch http://security.FreeBSD.org/patches/SA-06:23/openssl-correction.patch
# fetch http://security.FreeBSD.org/patches/SA-06:23/openssl-correction.patch.asc
b) Execute the following commands as root:
# cd /usr/src
# patch < /path/to/patch
c) Recompile the operating system as described in
and reboot the
system.
NOTE: Any third-party applications, including those installed from the
FreeBSD ports collection, which are statically linked to libcrypto(3)
should be recompiled in order to use the corrected code.
NOTE ALSO: The above patch reduces the functionality of libcrypto(3) by
prohibiting the use of exceptionally large public keys. It is believed
that no existing applications legitimately use such key lengths as would
be affected by this change.
VI. Correction details
The following list contains the revision numbers of each file that was
corrected in FreeBSD.
Branch Revision
Path
- -------------------------------------------------------------------------
RELENG_4
src/crypto/openssl/crypto/asn1/tasn_dec.c 1.1.1.1.2.3
src/crypto/openssl/crypto/dh/dh.h 1.1.1.1.2.5
src/crypto/openssl/crypto/dh/dh_err.c 1.1.1.1.2.4
src/crypto/openssl/crypto/dh/dh_key.c 1.1.1.1.2.9
src/crypto/openssl/crypto/dsa/dsa.h 1.1.1.1.2.5
src/crypto/openssl/crypto/dsa/dsa_err.c 1.1.1.1.2.4
src/crypto/openssl/crypto/dsa/dsa_ossl.c 1.1.1.1.2.8
src/crypto/openssl/crypto/rsa/rsa.h 1.2.2.9
src/crypto/openssl/crypto/rsa/rsa_eay.c 1.2.4.9
src/crypto/openssl/crypto/rsa/rsa_err.c 1.1.1.1.2.4
src/crypto/openssl/ssl/s2_clnt.c 1.2.2.9
src/crypto/openssl/ssl/s3_srvr.c 1.1.1.1.2.10
src/crypto/openssl/ssl/ssl_lib.c 1.1.1.1.2.9
RELENG_4_11
src/UPDATING 1.73.2.91.2.25
src/sys/conf/newvers.sh 1.44.2.39.2.28
src/crypto/openssl/crypto/asn1/tasn_dec.c 1.1.1.1.2.2.6.1
src/crypto/openssl/crypto/dh/dh.h 1.1.1.1.2.4.8.1
src/crypto/openssl/crypto/dh/dh_err.c 1.1.1.1.2.3.8.1
src/crypto/openssl/crypto/dh/dh_key.c 1.1.1.1.2.7.6.2
src/crypto/openssl/crypto/dsa/dsa.h 1.1.1.1.2.4.8.1
src/crypto/openssl/crypto/dsa/dsa_err.c 1.1.1.1.2.3.8.1
src/crypto/openssl/crypto/dsa/dsa_ossl.c 1.1.1.1.2.7.6.1
src/crypto/openssl/crypto/rsa/rsa.h 1.2.2.8.4.1
src/crypto/openssl/crypto/rsa/rsa_eay.c 1.2.4.8.4.1
src/crypto/openssl/crypto/rsa/rsa_err.c 1.1.1.1.2.3.8.1
src/crypto/openssl/ssl/s2_clnt.c 1.2.2.8.4.1
src/crypto/openssl/ssl/s3_srvr.c 1.1.1.1.2.9.4.1
src/crypto/openssl/ssl/ssl_lib.c 1.1.1.1.2.8.4.1
RELENG_5
src/crypto/openssl/crypto/asn1/tasn_dec.c 1.1.1.2.4.1
src/crypto/openssl/crypto/dh/dh.h 1.1.1.6.6.1
src/crypto/openssl/crypto/dh/dh_err.c 1.1.1.4.6.2
src/crypto/openssl/crypto/dh/dh_key.c 1.1.1.8.4.3
src/crypto/openssl/crypto/dsa/dsa.h 1.1.1.6.6.2
src/crypto/openssl/crypto/dsa/dsa_err.c 1.1.1.4.6.1
src/crypto/openssl/crypto/dsa/dsa_ossl.c 1.1.1.7.4.2
src/crypto/openssl/crypto/rsa/rsa.h 1.10.4.2
src/crypto/openssl/crypto/rsa/rsa_eay.c 1.12.4.2
src/crypto/openssl/crypto/rsa/rsa_err.c 1.1.1.4.6.1
src/crypto/openssl/ssl/s2_clnt.c 1.12.2.2
src/crypto/openssl/ssl/s3_srvr.c 1.1.1.13.2.2
src/crypto/openssl/ssl/ssl_lib.c 1.1.1.11.2.2
RELENG_5_5
src/UPDATING 1.342.2.35.2.7
src/sys/conf/newvers.sh 1.62.2.21.2.9
src/crypto/openssl/crypto/asn1/tasn_dec.c 1.1.1.2.16.1
src/crypto/openssl/crypto/dh/dh.h 1.1.1.6.18.1
src/crypto/openssl/crypto/dh/dh_err.c 1.1.1.4.6.1.4.1
src/crypto/openssl/crypto/dh/dh_key.c 1.1.1.8.4.1.4.2
src/crypto/openssl/crypto/dsa/dsa.h 1.1.1.6.6.1.4.1
src/crypto/openssl/crypto/dsa/dsa_err.c 1.1.1.4.18.1
src/crypto/openssl/crypto/dsa/dsa_ossl.c 1.1.1.7.4.1.4.1
src/crypto/openssl/crypto/rsa/rsa.h 1.10.4.1.4.1
src/crypto/openssl/crypto/rsa/rsa_eay.c 1.12.4.1.4.1
src/crypto/openssl/crypto/rsa/rsa_err.c 1.1.1.4.18.1
src/crypto/openssl/ssl/s2_clnt.c 1.12.2.1.4.1
src/crypto/openssl/ssl/s3_srvr.c 1.1.1.13.2.1.4.1
src/crypto/openssl/ssl/ssl_lib.c 1.1.1.11.2.1.4.1
RELENG_5_4
src/UPDATING 1.342.2.24.2.30
src/sys/conf/newvers.sh 1.62.2.18.2.26
src/crypto/openssl/crypto/asn1/tasn_dec.c 1.1.1.2.8.1
src/crypto/openssl/crypto/dh/dh.h 1.1.1.6.10.1
src/crypto/openssl/crypto/dh/dh_err.c 1.1.1.4.6.1.2.1
src/crypto/openssl/crypto/dh/dh_key.c 1.1.1.8.4.1.2.2
src/crypto/openssl/crypto/dsa/dsa.h 1.1.1.6.6.1.2.1
src/crypto/openssl/crypto/dsa/dsa_err.c 1.1.1.4.10.1
src/crypto/openssl/crypto/dsa/dsa_ossl.c 1.1.1.7.4.1.2.1
src/crypto/openssl/crypto/rsa/rsa.h 1.10.4.1.2.1
src/crypto/openssl/crypto/rsa/rsa_eay.c 1.12.4.1.2.1
src/crypto/openssl/crypto/rsa/rsa_err.c 1.1.1.4.10.1
src/crypto/openssl/ssl/s2_clnt.c 1.12.2.1.2.1
src/crypto/openssl/ssl/s3_srvr.c 1.1.1.13.2.1.2.1
src/crypto/openssl/ssl/ssl_lib.c 1.1.1.11.2.1.2.1
RELENG_5_3
src/UPDATING 1.342.2.13.2.39
src/sys/conf/newvers.sh 1.62.2.15.2.41
src/crypto/openssl/crypto/asn1/tasn_dec.c 1.1.1.2.6.1
src/crypto/openssl/crypto/dh/dh.h 1.1.1.6.8.1
src/crypto/openssl/crypto/dh/dh_err.c 1.1.1.4.8.1
src/crypto/openssl/crypto/dh/dh_key.c 1.1.1.8.6.2
src/crypto/openssl/crypto/dsa/dsa.h 1.1.1.6.8.1
src/crypto/openssl/crypto/dsa/dsa_err.c 1.1.1.4.8.1
src/crypto/openssl/crypto/dsa/dsa_ossl.c 1.1.1.7.6.1
src/crypto/openssl/crypto/rsa/rsa.h 1.10.6.1
src/crypto/openssl/crypto/rsa/rsa_eay.c 1.12.6.1
src/crypto/openssl/crypto/rsa/rsa_err.c 1.1.1.4.8.1
src/crypto/openssl/ssl/s2_clnt.c 1.12.4.1
src/crypto/openssl/ssl/s3_srvr.c 1.1.1.13.4.1
src/crypto/openssl/ssl/ssl_lib.c 1.1.1.11.4.1
RELENG_6
src/crypto/openssl/crypto/asn1/tasn_dec.c 1.1.1.2.10.1
src/crypto/openssl/crypto/dh/dh.h 1.1.1.6.12.1
src/crypto/openssl/crypto/dh/dh_err.c 1.1.1.5.2.1
src/crypto/openssl/crypto/dh/dh_key.c 1.1.1.9.2.2
src/crypto/openssl/crypto/dsa/dsa.h 1.1.1.7.2.1
src/crypto/openssl/crypto/dsa/dsa_err.c 1.1.1.4.12.1
src/crypto/openssl/crypto/dsa/dsa_ossl.c 1.1.1.8.2.1
src/crypto/openssl/crypto/rsa/rsa.h 1.11.2.1
src/crypto/openssl/crypto/rsa/rsa_eay.c 1.13.2.1
src/crypto/openssl/crypto/rsa/rsa_err.c 1.1.1.4.12.1
src/crypto/openssl/ssl/s2_clnt.c 1.13.2.1
src/crypto/openssl/ssl/s3_srvr.c 1.1.1.14.2.1
src/crypto/openssl/ssl/ssl_lib.c 1.1.1.12.2.1
RELENG_6_1
src/UPDATING 1.416.2.22.2.11
src/sys/conf/newvers.sh 1.69.2.11.2.11
src/crypto/openssl/crypto/asn1/tasn_dec.c 1.1.1.2.14.1
src/crypto/openssl/crypto/dh/dh.h 1.1.1.6.16.1
src/crypto/openssl/crypto/dh/dh_err.c 1.1.1.5.6.1
src/crypto/openssl/crypto/dh/dh_key.c 1.1.1.9.6.2
src/crypto/openssl/crypto/dsa/dsa.h 1.1.1.7.6.1
src/crypto/openssl/crypto/dsa/dsa_err.c 1.1.1.4.16.1
src/crypto/openssl/crypto/dsa/dsa_ossl.c 1.1.1.8.6.1
src/crypto/openssl/crypto/rsa/rsa.h 1.11.6.1
src/crypto/openssl/crypto/rsa/rsa_eay.c 1.13.6.1
src/crypto/openssl/crypto/rsa/rsa_err.c 1.1.1.4.16.1
src/crypto/openssl/ssl/s2_clnt.c 1.13.6.1
src/crypto/openssl/ssl/s3_srvr.c 1.1.1.14.6.1
src/crypto/openssl/ssl/ssl_lib.c 1.1.1.12.6.1
RELENG_6_0
src/UPDATING 1.416.2.3.2.19
src/sys/conf/newvers.sh 1.69.2.8.2.15
src/crypto/openssl/crypto/asn1/tasn_dec.c 1.1.1.2.12.1
src/crypto/openssl/crypto/dh/dh.h 1.1.1.6.14.1
src/crypto/openssl/crypto/dh/dh_err.c 1.1.1.5.4.1
src/crypto/openssl/crypto/dh/dh_key.c 1.1.1.9.4.2
src/crypto/openssl/crypto/dsa/dsa.h 1.1.1.7.4.1
src/crypto/openssl/crypto/dsa/dsa_err.c 1.1.1.4.14.1
src/crypto/openssl/crypto/dsa/dsa_ossl.c 1.1.1.8.4.1
src/crypto/openssl/crypto/rsa/rsa.h 1.11.4.1
src/crypto/openssl/crypto/rsa/rsa_eay.c 1.13.4.1
src/crypto/openssl/crypto/rsa/rsa_err.c 1.1.1.4.14.1
src/crypto/openssl/ssl/s2_clnt.c 1.13.4.1
src/crypto/openssl/ssl/s3_srvr.c 1.1.1.14.4.1
src/crypto/openssl/ssl/ssl_lib.c 1.1.1.12.4.1
- -------------------------------------------------------------------------
VII. References
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-2937
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-2940
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-3738
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-4343
The latest revision of this advisory is available at
http://security.FreeBSD.org/advisories/FreeBSD-SA-06:23.openssl.asc
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