Protect yourself against future threats.
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AUSCERT External Security Bulletin Redistribution
ESB-2009.0394 -- [FreeBSD]
OpenSSL: Denial of Service
23 April 2009
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AusCERT Security Bulletin Summary
---------------------------------
Product: openssl
Publisher: FreeBSD
Operating System: FreeBSD
Impact: Denial of Service
Access: Remote/Unauthenticated
CVE Names: CVE-2009-0590
Ref: AA-2009.0066
AA-2009.0088
AA-2009.0091
ESB-2009.0324
Original Bulletin:
ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-09:08.openssl.asc
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FreeBSD-SA-09:08.openssl Security Advisory
The FreeBSD Project
Topic: Remotely exploitable crash in OpenSSL
Category: contrib
Module: openssl
Announced: 2009-04-22
Affects: All supported versions of FreeBSD.
Corrected: 2009-04-22 14:07:14 UTC (RELENG_7, 7.2-PRERELEASE)
2009-04-22 14:07:14 UTC (RELENG_7_2, 7.2-RC2)
2009-04-22 14:07:14 UTC (RELENG_7_1, 7.1-RELEASE-p5)
2009-04-22 14:07:14 UTC (RELENG_7_0, 7.0-RELEASE-p12)
2009-04-22 14:07:14 UTC (RELENG_6, 6.4-STABLE)
2009-04-22 14:07:14 UTC (RELENG_6_4, 6.4-RELEASE-p4)
2009-04-22 14:07:14 UTC (RELENG_6_3, 6.3-RELEASE-p10)
CVE Name: CVE-2009-0590
For general information regarding FreeBSD Security Advisories,
including descriptions of the fields above, security branches, and the
following sections, please visit <URL:http://security.FreeBSD.org/>.
I. Background
FreeBSD includes software from the OpenSSL Project. The OpenSSL Project is
a collaborative effort to develop a robust, commercial-grade, full-featured
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.
The function ASN1_STRING_print_ex is often used to print the contents of
an SSL certificate.
II. Problem Description
The function ASN1_STRING_print_ex does not properly validate the lengths
of BMPString or UniversalString objects before attempting to print them.
III. Impact
An application which attempts to print a BMPString or UniversalString
which has an invalid length will crash as a result of OpenSSL accessing
invalid memory locations. This could be used by an attacker to crash a
remote application.
IV. Workaround
No workaround is available, but applications which do not use the
ASN1_STRING_print_ex function (either directly or indirectly) are not
affected.
V. Solution
Perform one of the following:
1) Upgrade your vulnerable system to 6-STABLE, or 7-STABLE, or to the
RELENG_7_2, RELENG_7_1, RELENG_7_0, RELENG_6_4, or RELENG_6_3 security
branch dated after the correction date.
2) To patch your present system:
The following patches have been verified to apply to FreeBSD 6.3, 6.4,
7.0, 7.1, and 7.2 systems.
a) Download the relevant patch from the location below, and verify the
detached PGP signature using your PGP utility.
[FreeBSD 7.x]
# fetch http://security.FreeBSD.org/patches/SA-09:08/openssl.patch
# fetch http://security.FreeBSD.org/patches/SA-09:08/openssl.patch.asc
[FreeBSD 6.x]
# fetch http://security.FreeBSD.org/patches/SA-09:08/openssl6.patch
# fetch http://security.FreeBSD.org/patches/SA-09:08/openssl6.patch.asc
b) Execute the following commands as root:
# cd /usr/src
# patch < /path/to/patch
# cd /usr/src/secure/lib/libcrypto
# make obj && make depend && make includes && make && make install
NOTE: On the amd64 platform, the above procedure will not update the
lib32 (i386 compatibility) libraries. On amd64 systems where the i386
compatibility libraries are used, the operating system should instead
be recompiled as described in
<URL:http://www.FreeBSD.org/handbook/makeworld.html>
VI. Correction details
The following list contains the revision numbers of each file that was
corrected in FreeBSD.
CVS:
Branch Revision
Path
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RELENG_6
src/crypto/openssl/crypto/asn1/asn1_err.c 1.1.1.4.12.1
src/crypto/openssl/crypto/asn1/tasn_dec.c 1.1.1.2.10.2
src/crypto/openssl/crypto/asn1/asn1.h 1.1.1.7.10.1
RELENG_6_4
src/UPDATING 1.416.2.40.2.8
src/sys/conf/newvers.sh 1.69.2.18.2.10
src/crypto/openssl/crypto/asn1/asn1_err.c 1.1.1.4.24.1
src/crypto/openssl/crypto/asn1/tasn_dec.c 1.1.1.2.10.1.6.1
src/crypto/openssl/crypto/asn1/asn1.h 1.1.1.7.22.1
RELENG_6_3
src/UPDATING 1.416.2.37.2.15
src/sys/conf/newvers.sh 1.69.2.15.2.14
src/crypto/openssl/crypto/asn1/asn1_err.c 1.1.1.4.22.1
src/crypto/openssl/crypto/asn1/tasn_dec.c 1.1.1.2.10.1.4.1
src/crypto/openssl/crypto/asn1/asn1.h 1.1.1.7.20.1
RELENG_7
src/crypto/openssl/crypto/asn1/asn1_err.c 1.1.1.6.2.1
src/crypto/openssl/crypto/asn1/tasn_dec.c 1.1.1.5.2.1
src/crypto/openssl/crypto/asn1/asn1.h 1.2.2.1
RELENG_7_2
src/UPDATING 1.507.2.23.2.2
src/crypto/openssl/crypto/asn1/asn1_err.c 1.1.1.6.8.1
src/crypto/openssl/crypto/asn1/tasn_dec.c 1.1.1.5.8.1
src/crypto/openssl/crypto/asn1/asn1.h 1.2.8.1
RELENG_7_1
src/UPDATING 1.507.2.13.2.8
src/sys/conf/newvers.sh 1.72.2.9.2.9
src/crypto/openssl/crypto/asn1/asn1_err.c 1.1.1.6.6.1
src/crypto/openssl/crypto/asn1/tasn_dec.c 1.1.1.5.6.1
src/crypto/openssl/crypto/asn1/asn1.h 1.2.6.1
RELENG_7_0
src/UPDATING 1.507.2.3.2.16
src/sys/conf/newvers.sh 1.72.2.5.2.16
src/crypto/openssl/crypto/asn1/asn1_err.c 1.1.1.6.4.1
src/crypto/openssl/crypto/asn1/tasn_dec.c 1.1.1.5.4.1
src/crypto/openssl/crypto/asn1/asn1.h 1.2.4.1
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Subversion:
Branch/path Revision
- - -------------------------------------------------------------------------
stable/6/ r191381
releng/6.4/ r191381
releng/6.3/ r191381
stable/7/ r191381
releng/7.2/ r191381
releng/7.1/ r191381
releng/7.0/ r191381
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VII. References
http://openssl.org/news/secadv_20090325.txt
[Note that two of the issues mentioned in the OpenSSL advisory do
not affect FreeBSD.]
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-0590
The latest revision of this advisory is available at
http://security.FreeBSD.org/advisories/FreeBSD-SA-09:08.openssl.asc
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