Protect yourself against future threats.
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
===========================================================================
AUSCERT External Security Bulletin Redistribution
ESB-2009.1591
SSL protocol flaw
4 December 2009
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: ssl
Publisher: FreeBSD
Operating System: FreeBSD
Impact/Access: Unauthorised Access -- Remote with User Interaction
Provide Misleading Information -- Remote with User Interaction
Resolution: Patch/Upgrade
CVE Names: CVE-2009-3555
Reference: ASB-2009.1125.2
Original Bulletin:
ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-09:15.ssl.asc
- --------------------------BEGIN INCLUDED TEXT--------------------
- -----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
=============================================================================
FreeBSD-SA-09:15.ssl Security Advisory
The FreeBSD Project
Topic: SSL protocol flaw
Category: contrib
Module: openssl
Announced: 2009-12-03
Credits: Marsh Ray, Steve Dispensa
Affects: All supported versions of FreeBSD.
Corrected: 2009-12-03 09:18:40 UTC (RELENG_8, 8.0-STABLE)
2009-12-03 09:18:40 UTC (RELENG_8_0, 8.0-RELEASE-p1)
2009-12-03 09:18:40 UTC (RELENG_7, 7.2-STABLE)
2009-12-03 09:18:40 UTC (RELENG_7_2, 7.2-RELEASE-p5)
2009-12-03 09:18:40 UTC (RELENG_7_1, 7.1-RELEASE-p9)
2009-12-03 09:18:40 UTC (RELENG_6, 6.4-STABLE)
2009-12-03 09:18:40 UTC (RELENG_6_4, 6.4-RELEASE-p8)
2009-12-03 09:18:40 UTC (RELENG_6_3, 6.3-RELEASE-p14)
CVE Name: CVE-2009-3555
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/>.
0. Revision History
v1.0 2009-12-03 Initial release.
v1.1 2009-12-03 Corrected instructions in section V.2)b).
I. Background
The SSL (Secure Sockets Layer) and TLS (Transport Layer Security) protocols
provide a secure communications layer over which other protocols can be
utilized. The most widespread use of SSL/TLS is to add security to the
HTTP protocol, thus producing HTTPS.
FreeBSD includes software from the OpenSSL Project which implements SSL
and TLS.
II. Problem Description
The SSL version 3 and TLS protocols support session renegotiation without
cryptographically tying the new session parameters to the old parameters.
III. Impact
An attacker who can intercept a TCP connection being used for SSL or TLS
can cause the initial session negotiation to take the place of a session
renegotiation. This can be exploited in several ways, including:
* Causing a server to interpret incoming messages as having been sent
under the auspices of a client SSL key when in fact they were not;
* Causing a client request to be appended to an attacker-supplied
request, potentially revealing to the attacker the contents of the client
request (including any authentication parameters); and
* Causing a client to receive a response to an attacker-supplied request
instead of a response to the request sent by the client.
IV. Workaround
No workaround is available.
V. Solution
NOTE WELL: This update causes OpenSSL to reject any attempt to renegotiate
SSL / TLS session parameters. As a result, connections in which the other
party attempts to renegotiate session parameters will break. In practice,
however, session renegotiation is a rarely-used feature, so disabling this
functionality is unlikely to cause problems for most systems.
Perform one of the following:
1) Upgrade your vulnerable system to 6-STABLE, 7-STABLE, or 8-STABLE, or to
the RELENG_8_0, RELENG_7_2, RELENG_7_1, 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,
7.1, 7.2, and 8.0 systems.
a) Download the relevant patch from the location below, and verify the
detached PGP signature using your PGP utility.
# fetch http://security.FreeBSD.org/patches/SA-09:15/ssl.patch
# fetch http://security.FreeBSD.org/patches/SA-09:15/ssl.patch.asc
b) Execute the following commands as root:
# cd /usr/src
# patch < /path/to/patch
# cd /usr/src/secure/lib/libssl
# 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
- - -------------------------------------------------------------------------
RELENG_6
src/crypto/openssl/ssl/s3_pkt.c 1.1.1.10.2.1
src/crypto/openssl/ssl/s3_srvr.c 1.1.1.14.2.3
src/crypto/openssl/ssl/s3_lib.c 1.1.1.10.2.1
RELENG_6_4
src/UPDATING 1.416.2.40.2.12
src/sys/conf/newvers.sh 1.69.2.18.2.14
src/crypto/openssl/ssl/s3_pkt.c 1.1.1.10.12.1
src/crypto/openssl/ssl/s3_srvr.c 1.1.1.14.2.1.6.2
src/crypto/openssl/ssl/s3_lib.c 1.1.1.10.12.1
RELENG_6_3
src/UPDATING 1.416.2.37.2.19
src/sys/conf/newvers.sh 1.69.2.15.2.18
src/crypto/openssl/ssl/s3_pkt.c 1.1.1.10.10.1
src/crypto/openssl/ssl/s3_srvr.c 1.1.1.14.2.1.4.2
src/crypto/openssl/ssl/s3_lib.c 1.1.1.10.10.1
RELENG_7
src/crypto/openssl/ssl/s3_pkt.c 1.1.1.12.2.1
src/crypto/openssl/ssl/s3_srvr.c 1.1.1.17.2.2
src/crypto/openssl/ssl/s3_lib.c 1.1.1.13.2.1
RELENG_7_2
src/UPDATING 1.507.2.23.2.8
src/sys/conf/newvers.sh 1.72.2.11.2.9
src/crypto/openssl/ssl/s3_pkt.c 1.1.1.12.8.1
src/crypto/openssl/ssl/s3_srvr.c 1.1.1.17.2.1.2.1
src/crypto/openssl/ssl/s3_lib.c 1.1.1.13.8.1
RELENG_7_1
src/UPDATING 1.507.2.13.2.12
src/sys/conf/newvers.sh 1.72.2.9.2.13
src/crypto/openssl/ssl/s3_pkt.c 1.1.1.12.6.1
src/crypto/openssl/ssl/s3_srvr.c 1.1.1.17.6.2
src/crypto/openssl/ssl/s3_lib.c 1.1.1.13.6.1
RELENG_8
src/crypto/openssl/ssl/s3_pkt.c 1.2.2.1
src/crypto/openssl/ssl/s3_srvr.c 1.3.2.1
src/crypto/openssl/ssl/s3_lib.c 1.2.2.1
RELENG_8_0
src/UPDATING 1.632.2.7.2.4
src/sys/conf/newvers.sh 1.83.2.6.2.4
src/crypto/openssl/ssl/s3_pkt.c 1.2.4.1
src/crypto/openssl/ssl/s3_srvr.c 1.3.4.1
src/crypto/openssl/ssl/s3_lib.c 1.2.4.1
- - -------------------------------------------------------------------------
Subversion:
Branch/path Revision
- - -------------------------------------------------------------------------
stable/6/ r200054
releng/6.4/ r200054
releng/6.3/ r200054
stable/7/ r200054
releng/7.2/ r200054
releng/7.1/ r200054
- - -------------------------------------------------------------------------
VII. References
http://extendedsubset.com/Renegotiating_TLS.pdf
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-3555
The latest revision of this advisory is available at
http://security.FreeBSD.org/advisories/FreeBSD-SA-09:15.ssl.asc
- -----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.10 (FreeBSD)
iEYEARECAAYFAksYIm4ACgkQFdaIBMps37J5jwCZAQurPSu2CyGz2thi8ljb+MlF
LcwAnjSLYWT1nV5G9a46n9zcrpEqydJ3
=XuZD
- -----END PGP SIGNATURE-----
- --------------------------END INCLUDED TEXT--------------------
You have received this e-mail bulletin as a result of your organisation's
registration with AusCERT. The mailing list you are subscribed to is
maintained within your organisation, so if you do not wish to continue
receiving these bulletins you should contact your local IT manager. If
you do not know who that is, please send an email to auscert@auscert.org.au
and we will forward your request to the appropriate person.
NOTE: Third Party Rights
This security bulletin is provided as a service to AusCERT's members. As
AusCERT did not write the document quoted above, AusCERT has had no control
over its content. The decision to follow or act on information or advice
contained in this security bulletin is the responsibility of each user or
organisation, and should be considered in accordance with your organisation's
site policies and procedures. AusCERT takes no responsibility for consequences
which may arise from following or acting on information or advice contained in
this security bulletin.
NOTE: This is only the original release of the security bulletin. It may
not be updated when updates to the original are made. If downloading at
a later date, it is recommended that the bulletin is retrieved directly
from the author's website to ensure that the information is still current.
Contact information for the authors of the original document is included
in the Security Bulletin above. If you have any questions or need further
information, please contact them directly.
Previous advisories and external security bulletins can be retrieved from:
http://www.auscert.org.au/render.html?cid=1980
If you believe that your computer system has been compromised or attacked in
any way, we encourage you to let us know by completing the secure National IT
Incident Reporting Form at:
http://www.auscert.org.au/render.html?it=3192
===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072
Internet Email: auscert@auscert.org.au
Facsimile: (07) 3365 7031
Telephone: (07) 3365 4417 (International: +61 7 3365 4417)
AusCERT personnel answer during Queensland business hours
which are GMT+10:00 (AEST).
On call after hours for member emergencies only.
===========================================================================
-----BEGIN PGP SIGNATURE-----
Comment: http://www.auscert.org.au/render.html?it=1967
iD8DBQFLGEOdNVH5XJJInbgRAryOAJ9YhZ8chh4nu1LBNVYSRGn31NptJACfSvyl
u8e8DFdHsyJCyA1RgmiinvI=
=N+OF
-----END PGP SIGNATURE-----