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Category:   Application (VPN)  >   OpenSSL Vendors:   OpenSSL.org
(Red Hat Issues Fix) OpenSSL SSL 3.0 Protocol Downgrade Flaw Lets Remote Users Decrypt SSL Traffic
SecurityTracker Alert ID:  1031060
SecurityTracker URL:  http://securitytracker.com/id/1031060
CVE Reference:   CVE-2014-3566   (Links to External Site)
Date:  Oct 16 2014
Impact:   Disclosure of system information, Disclosure of user information
Fix Available:  Yes  Vendor Confirmed:  Yes  Exploit Included:  Yes  

Description:   A vulnerability was reported in OpenSSL. A remote user can decrypt SSL sessions in certain cases.

A remote user can with the ability to conduct a man-in-the-middle attack can force a client to negotiate a downgrade to SSLv3 instead of a TLS v1.x protocol and then conduct a BEAST-style of attack to decrypt portions of the session.

This protocol vulnerability is referred to as the POODLE ("Padding Oracle On Downgraded Legacy Encryption") vulnerability.

This is a flaw in the protocol rather than in the OpenSSL implementation.

The original advisory is available at:

https://www.openssl.org/~bodo/ssl-poodle.pdf

Bodo Moller, Thai Duong, and Krzysztof Kotowicz reported this vulnerability.

Impact:   A remote user with the ability to conduct a man-in-the-middle attack can decrypt SSL sessions.
Solution:   Red Hat has issued a fix.

The Red Hat advisories are available at:

https://rhn.redhat.com/errata/RHSA-2014-1652.html
https://rhn.redhat.com/errata/RHSA-2014-1653.html

Vendor URL:  www.openssl.org/ (Links to External Site)
Cause:   Access control error
Underlying OS:  Linux (Red Hat Enterprise)
Underlying OS Comments:  5, 6, 7

Message History:   This archive entry is a follow-up to the message listed below.
Oct 15 2014 OpenSSL SSL 3.0 Protocol Downgrade Flaw Lets Remote Users Decrypt SSL Traffic



 Source Message Contents

Subject:  [RHSA-2014:1653-01] Moderate: openssl security update

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

=====================================================================
                   Red Hat Security Advisory

Synopsis:          Moderate: openssl security update
Advisory ID:       RHSA-2014:1653-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2014-1653.html
Issue date:        2014-10-16
=====================================================================

1. Summary:

Updated openssl packages that contain a backported patch to mitigate the
CVE-2014-3566 issue are now available for Red Hat Enterprise Linux 5.

Red Hat Product Security has rated this update as having Moderate security
impact.

2. Relevant releases/architectures:

RHEL Desktop Workstation (v. 5 client) - i386, x86_64
Red Hat Enterprise Linux (v. 5 server) - i386, ia64, ppc, s390x, x86_64
Red Hat Enterprise Linux Desktop (v. 5 client) - i386, x86_64

3. Description:

OpenSSL is a toolkit that implements the Secure Sockets Layer (SSL),
Transport Layer Security (TLS), and Datagram Transport Layer Security
(DTLS) protocols, as well as a full-strength, general purpose cryptography
library.

This update adds support for the TLS Fallback Signaling Cipher Suite Value
(TLS_FALLBACK_SCSV), which can be used to prevent protocol downgrade
attacks against applications which re-connect using a lower SSL/TLS
protocol version when the initial connection indicating the highest
supported protocol version fails.

This can prevent a forceful downgrade of the communication to SSL 3.0.
The SSL 3.0 protocol was found to be vulnerable to the padding oracle
attack when using block cipher suites in cipher block chaining (CBC) mode.
This issue is identified as CVE-2014-3566, and also known under the alias
POODLE. This SSL 3.0 protocol flaw will not be addressed in a future
update; it is recommended that users configure their applications to
require at least TLS protocol version 1.0 for secure communication.

For additional information about this flaw, see the Knowledgebase article
at https://access.redhat.com/articles/1232123

All OpenSSL users are advised to upgrade to these updated packages, which
contain a backported patch to mitigate the CVE-2014-3566 issue. For the
update to take effect, all services linked to the OpenSSL library (such as
httpd and other SSL-enabled services) must be restarted or the system
rebooted.

4. Solution:

Before applying this update, make sure all previously released errata
relevant to your system have been applied.

This update is available via the Red Hat Network. Details on how to use the
Red Hat Network to apply this update are available at
https://access.redhat.com/articles/11258

5. Bugs fixed (https://bugzilla.redhat.com/):

1152789 - CVE-2014-3566 openssl: Padding Oracle On Downgraded Legacy Encryption attack

6. Package List:

Red Hat Enterprise Linux Desktop (v. 5 client):

Source:
openssl-0.9.8e-31.el5_11.src.rpm

i386:
openssl-0.9.8e-31.el5_11.i386.rpm
openssl-0.9.8e-31.el5_11.i686.rpm
openssl-debuginfo-0.9.8e-31.el5_11.i386.rpm
openssl-debuginfo-0.9.8e-31.el5_11.i686.rpm
openssl-perl-0.9.8e-31.el5_11.i386.rpm

x86_64:
openssl-0.9.8e-31.el5_11.i686.rpm
openssl-0.9.8e-31.el5_11.x86_64.rpm
openssl-debuginfo-0.9.8e-31.el5_11.i686.rpm
openssl-debuginfo-0.9.8e-31.el5_11.x86_64.rpm
openssl-perl-0.9.8e-31.el5_11.x86_64.rpm

RHEL Desktop Workstation (v. 5 client):

Source:
openssl-0.9.8e-31.el5_11.src.rpm

i386:
openssl-debuginfo-0.9.8e-31.el5_11.i386.rpm
openssl-devel-0.9.8e-31.el5_11.i386.rpm

x86_64:
openssl-debuginfo-0.9.8e-31.el5_11.i386.rpm
openssl-debuginfo-0.9.8e-31.el5_11.x86_64.rpm
openssl-devel-0.9.8e-31.el5_11.i386.rpm
openssl-devel-0.9.8e-31.el5_11.x86_64.rpm

Red Hat Enterprise Linux (v. 5 server):

Source:
openssl-0.9.8e-31.el5_11.src.rpm

i386:
openssl-0.9.8e-31.el5_11.i386.rpm
openssl-0.9.8e-31.el5_11.i686.rpm
openssl-debuginfo-0.9.8e-31.el5_11.i386.rpm
openssl-debuginfo-0.9.8e-31.el5_11.i686.rpm
openssl-devel-0.9.8e-31.el5_11.i386.rpm
openssl-perl-0.9.8e-31.el5_11.i386.rpm

ia64:
openssl-0.9.8e-31.el5_11.i686.rpm
openssl-0.9.8e-31.el5_11.ia64.rpm
openssl-debuginfo-0.9.8e-31.el5_11.i686.rpm
openssl-debuginfo-0.9.8e-31.el5_11.ia64.rpm
openssl-devel-0.9.8e-31.el5_11.ia64.rpm
openssl-perl-0.9.8e-31.el5_11.ia64.rpm

ppc:
openssl-0.9.8e-31.el5_11.ppc.rpm
openssl-0.9.8e-31.el5_11.ppc64.rpm
openssl-debuginfo-0.9.8e-31.el5_11.ppc.rpm
openssl-debuginfo-0.9.8e-31.el5_11.ppc64.rpm
openssl-devel-0.9.8e-31.el5_11.ppc.rpm
openssl-devel-0.9.8e-31.el5_11.ppc64.rpm
openssl-perl-0.9.8e-31.el5_11.ppc.rpm

s390x:
openssl-0.9.8e-31.el5_11.s390.rpm
openssl-0.9.8e-31.el5_11.s390x.rpm
openssl-debuginfo-0.9.8e-31.el5_11.s390.rpm
openssl-debuginfo-0.9.8e-31.el5_11.s390x.rpm
openssl-devel-0.9.8e-31.el5_11.s390.rpm
openssl-devel-0.9.8e-31.el5_11.s390x.rpm
openssl-perl-0.9.8e-31.el5_11.s390x.rpm

x86_64:
openssl-0.9.8e-31.el5_11.i686.rpm
openssl-0.9.8e-31.el5_11.x86_64.rpm
openssl-debuginfo-0.9.8e-31.el5_11.i386.rpm
openssl-debuginfo-0.9.8e-31.el5_11.i686.rpm
openssl-debuginfo-0.9.8e-31.el5_11.x86_64.rpm
openssl-devel-0.9.8e-31.el5_11.i386.rpm
openssl-devel-0.9.8e-31.el5_11.x86_64.rpm
openssl-perl-0.9.8e-31.el5_11.x86_64.rpm

These packages are GPG signed by Red Hat for security.  Our key and
details on how to verify the signature are available from
https://access.redhat.com/security/team/key/#package

7. References:

https://access.redhat.com/security/updates/classification/#moderate
https://access.redhat.com/articles/1232123

8. Contact:

The Red Hat security contact is <secalert@redhat.com>.  More contact
details at https://access.redhat.com/security/team/contact/

Copyright 2014 Red Hat, Inc.
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