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Red Hat Security Advisory 2016-0304-01

Red Hat Security Advisory 2016-0304-01
Posted Mar 2, 2016
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2016-0304-01 - OpenSSL is a toolkit that implements the Secure Sockets Layer and Transport Layer Security protocols, as well as a full-strength, general purpose cryptography library. A padding oracle flaw was found in the Secure Sockets Layer version 2.0 protocol. An attacker can potentially use this flaw to decrypt RSA-encrypted cipher text from a connection using a newer SSL/TLS protocol version, allowing them to decrypt such connections. This cross-protocol attack is publicly referred to as DROWN.

tags | advisory, protocol
systems | linux, redhat
advisories | CVE-2015-0293, CVE-2015-3197, CVE-2016-0703, CVE-2016-0704, CVE-2016-0800
SHA-256 | 947119e9fd5d8f11486ab1908732c47d26541cd1c088d1e31ab0fea8539714b4

Red Hat Security Advisory 2016-0304-01

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

Synopsis: Important: openssl security update
Advisory ID: RHSA-2016:0304-01
Product: Red Hat Enterprise Linux
Advisory URL: https://rhn.redhat.com/errata/RHSA-2016-0304.html
Issue date: 2016-03-01
CVE Names: CVE-2015-0293 CVE-2015-3197 CVE-2016-0703
CVE-2016-0704 CVE-2016-0800
=====================================================================

1. Summary:

Updated openssl packages that fix multiple security issues are now
available for Red Hat Enterprise Linux 5.6 and 5.9 Long Life.

Red Hat Product Security has rated this update as having Important security
impact. Common Vulnerability Scoring System (CVSS) base scores, which give
detailed severity ratings, are available for each vulnerability from the
CVE links in the References section.

2. Relevant releases/architectures:

Red Hat Enterprise Linux LL (v. 5.6 server) - i386, ia64, x86_64
Red Hat Enterprise Linux LL (v. 5.9 server) - i386, ia64, x86_64

3. Description:

OpenSSL is a toolkit that implements the Secure Sockets Layer (SSL v2/v3)
and Transport Layer Security (TLS v1) protocols, as well as a
full-strength, general purpose cryptography library.

A padding oracle flaw was found in the Secure Sockets Layer version 2.0
(SSLv2) protocol. An attacker can potentially use this flaw to decrypt
RSA-encrypted cipher text from a connection using a newer SSL/TLS protocol
version, allowing them to decrypt such connections. This cross-protocol
attack is publicly referred to as DROWN. (CVE-2016-0800)

Note: This issue was addressed by disabling the SSLv2 protocol by default
when using the 'SSLv23' connection methods, and removing support for weak
SSLv2 cipher suites. It is possible to re-enable the SSLv2 protocol in the
'SSLv23' connection methods by default by setting the OPENSSL_ENABLE_SSL2
environment variable before starting an application that needs to have
SSLv2 enabled. For more information, refer to the knowledge base article
linked to in the References section.

It was discovered that the SSLv2 servers using OpenSSL accepted SSLv2
connection handshakes that indicated non-zero clear key length for
non-export cipher suites. An attacker could use this flaw to decrypt
recorded SSLv2 sessions with the server by using it as a decryption
oracle.(CVE-2016-0703)

It was discovered that the SSLv2 protocol implementation in OpenSSL did
not properly implement the Bleichenbacher protection for export cipher
suites. An attacker could use a SSLv2 server using OpenSSL as a
Bleichenbacher oracle. (CVE-2016-0704)

Note: The CVE-2016-0703 and CVE-2016-0704 issues could allow for more
efficient exploitation of the CVE-2016-0800 issue via the DROWN attack.

A denial of service flaw was found in the way OpenSSL handled SSLv2
handshake messages. A remote attacker could use this flaw to cause a
TLS/SSL server using OpenSSL to exit on a failed assertion if it had both
the SSLv2 protocol and EXPORT-grade cipher suites enabled. (CVE-2015-0293)

A flaw was found in the way malicious SSLv2 clients could negotiate SSLv2
ciphers that have been disabled on the server. This could result in weak
SSLv2 ciphers being used for SSLv2 connections, making them vulnerable to
man-in-the-middle attacks. (CVE-2015-3197)

Red Hat would like to thank the OpenSSL project for reporting these issues.
Upstream acknowledges Nimrod Aviram and Sebastian Schinzel as the original
reporters of CVE-2016-0800 and CVE-2015-3197; David Adrian (University of
Michigan) and J. Alex Halderman (University of Michigan) as the original
reporters of CVE-2016-0703 and CVE-2016-0704; and Sean Burford (Google) and
Emilia Käsper (OpenSSL development team) as the original reporters of
CVE-2015-0293.

All openssl users are advised to upgrade to these updated packages, which
contain backported patches to correct these issues. For the update to take
effect, all services linked to the OpenSSL library 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.

For details on how to apply this update, refer to:

https://access.redhat.com/articles/11258

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

1202404 - CVE-2015-0293 openssl: assertion failure in SSLv2 servers
1301846 - CVE-2015-3197 OpenSSL: SSLv2 doesn't block disabled ciphers
1310593 - CVE-2016-0800 SSL/TLS: Cross-protocol attack on TLS using SSLv2 (DROWN)
1310811 - CVE-2016-0703 openssl: Divide-and-conquer session key recovery in SSLv2
1310814 - CVE-2016-0704 openssl: SSLv2 Bleichenbacher protection overwrites wrong bytes for export ciphers

6. Package List:

Red Hat Enterprise Linux LL (v. 5.6 server):

Source:
openssl-0.9.8e-12.el5_6.13.src.rpm

i386:
openssl-0.9.8e-12.el5_6.13.i386.rpm
openssl-0.9.8e-12.el5_6.13.i686.rpm
openssl-debuginfo-0.9.8e-12.el5_6.13.i386.rpm
openssl-debuginfo-0.9.8e-12.el5_6.13.i686.rpm
openssl-devel-0.9.8e-12.el5_6.13.i386.rpm
openssl-perl-0.9.8e-12.el5_6.13.i386.rpm

ia64:
openssl-0.9.8e-12.el5_6.13.i686.rpm
openssl-0.9.8e-12.el5_6.13.ia64.rpm
openssl-debuginfo-0.9.8e-12.el5_6.13.i686.rpm
openssl-debuginfo-0.9.8e-12.el5_6.13.ia64.rpm
openssl-devel-0.9.8e-12.el5_6.13.ia64.rpm
openssl-perl-0.9.8e-12.el5_6.13.ia64.rpm

x86_64:
openssl-0.9.8e-12.el5_6.13.i686.rpm
openssl-0.9.8e-12.el5_6.13.x86_64.rpm
openssl-debuginfo-0.9.8e-12.el5_6.13.i386.rpm
openssl-debuginfo-0.9.8e-12.el5_6.13.i686.rpm
openssl-debuginfo-0.9.8e-12.el5_6.13.x86_64.rpm
openssl-devel-0.9.8e-12.el5_6.13.i386.rpm
openssl-devel-0.9.8e-12.el5_6.13.x86_64.rpm
openssl-perl-0.9.8e-12.el5_6.13.x86_64.rpm

Red Hat Enterprise Linux LL (v. 5.9 server):

Source:
openssl-0.9.8e-26.el5_9.5.src.rpm

i386:
openssl-0.9.8e-26.el5_9.5.i386.rpm
openssl-0.9.8e-26.el5_9.5.i686.rpm
openssl-debuginfo-0.9.8e-26.el5_9.5.i386.rpm
openssl-debuginfo-0.9.8e-26.el5_9.5.i686.rpm
openssl-devel-0.9.8e-26.el5_9.5.i386.rpm
openssl-perl-0.9.8e-26.el5_9.5.i386.rpm

ia64:
openssl-0.9.8e-26.el5_9.5.i686.rpm
openssl-0.9.8e-26.el5_9.5.ia64.rpm
openssl-debuginfo-0.9.8e-26.el5_9.5.i686.rpm
openssl-debuginfo-0.9.8e-26.el5_9.5.ia64.rpm
openssl-devel-0.9.8e-26.el5_9.5.ia64.rpm
openssl-perl-0.9.8e-26.el5_9.5.ia64.rpm

x86_64:
openssl-0.9.8e-26.el5_9.5.i686.rpm
openssl-0.9.8e-26.el5_9.5.x86_64.rpm
openssl-debuginfo-0.9.8e-26.el5_9.5.i386.rpm
openssl-debuginfo-0.9.8e-26.el5_9.5.i686.rpm
openssl-debuginfo-0.9.8e-26.el5_9.5.x86_64.rpm
openssl-devel-0.9.8e-26.el5_9.5.i386.rpm
openssl-devel-0.9.8e-26.el5_9.5.x86_64.rpm
openssl-perl-0.9.8e-26.el5_9.5.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/

7. References:

https://access.redhat.com/security/cve/CVE-2015-0293
https://access.redhat.com/security/cve/CVE-2015-3197
https://access.redhat.com/security/cve/CVE-2016-0703
https://access.redhat.com/security/cve/CVE-2016-0704
https://access.redhat.com/security/cve/CVE-2016-0800
https://access.redhat.com/security/updates/classification/#important
https://access.redhat.com/articles/2176731
https://drownattack.com/
https://openssl.org/news/secadv/20160128.txt
https://openssl.org/news/secadv/20160301.txt

8. Contact:

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

Copyright 2016 Red Hat, Inc.
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