[FreeBSD] Schwachstelle in OpenSSL – FreeBSD-SA-09:08

[FreeBSD] Schwachstelle in OpenSSL - FreeBSD-SA-09:08

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Liebe Kolleginnen und Kollegen,

soeben erreichte uns nachfolgende Warnung des FreeBSD Security
Officers. Wir geben diese Informationen unveraendert an Sie weiter.

CVE-2009-0590 – Schwachstelle in der OpenSSL Funktion
ASN1_STRING_print_ex()

OpenSSL Anwendungen die den Inhalt von Zertifikaten ausgeben, u.a. SSL
Server, Clients und S/MIME Software, haben eine Schwachstelle in der
Funktion ASN1_STRING_print_ex(). Ein Funktionsaufruf zur Ausgabe eines
BMPString oder UniversalString mit einer Zeichenkette unzulaessiger
Laenge loest eine Speicherverletzung aus. Ein Angreifer kann diese
Schwachstelle ausnutzen um die Anwendung zum Absturz zu bringen.

Betroffen sind die folgenden Software Pakete und Plattformen:

Paket openssl

Alle unterstuetzten Versionen von FreeBSD.

Vom Hersteller werden ueberarbeitete Pakete zur Verfuegung gestellt.

Hersteller Advisory:
http://security.FreeBSD.org/advisories/FreeBSD-SA-09:08.openssl.asc

(c) der deutschen Zusammenfassung bei DFN-CERT Services GmbH; die
Verbreitung, auch auszugsweise, ist nur unter Hinweis auf den Urheber,
DFN-CERT Services GmbH, und nur zu nicht kommerziellen Zwecken
gestattet.

Mit freundlichen Gruessen,
Detlev O. Matthies

– —

Detlev O. Matthies, M.Sc. (Incident Response Team)

DFN-CERT Services GmbH, https://www.dfn-cert.de, Phone +49 40 808077-555
Sitz / Register: Hamburg, AG Hamburg, HRB 88805, Ust-IdNr.: DE 232129737
Sachsenstrasse 5, 20097 Hamburg/Germany, CEO: Dr. Klaus-Peter Kossakowski

Automatische Warnmeldungen https://www.cert.dfn.de/autowarn

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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 .

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

VI. Correction details

The following list contains the revision numbers of each file that was
corrected in FreeBSD.

CVS:

Branch Revision
Path
– – ————————————————————————-
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
– – ————————————————————————-

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
– – ————————————————————————-

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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