[RHSA-2016:0306-01] Important: openssl security update

[news 28]

-----BEGIN PGP SIGNED MESSAGE-----

Hash: SHA1

 

=====================================================================

Red Hat Security Advisory

 

Synopsis: Important: openssl security update

Advisory ID: RHSA-2016:0306-01

Product: Red Hat Enterprise Linux

Advisory URL: https://rhn.redhat.com/errata/RHSA-2016-0306.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 4 Extended Lifecycle Support.

 

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 AS (v. 4 ELS) - i386, ia64, x86_64

Red Hat Enterprise Linux ES (v. 4 ELS) - i386, 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 AS (v. 4 ELS):

 

Source:

openssl-0.9.7a-43.23.el4.src.rpm

 

i386:

openssl-0.9.7a-43.23.el4.i386.rpm

openssl-0.9.7a-43.23.el4.i686.rpm

openssl-debuginfo-0.9.7a-43.23.el4.i386.rpm

openssl-debuginfo-0.9.7a-43.23.el4.i686.rpm

openssl-devel-0.9.7a-43.23.el4.i386.rpm

openssl-perl-0.9.7a-43.23.el4.i386.rpm

 

ia64:

openssl-0.9.7a-43.23.el4.i686.rpm

openssl-0.9.7a-43.23.el4.ia64.rpm

openssl-debuginfo-0.9.7a-43.23.el4.i686.rpm

openssl-debuginfo-0.9.7a-43.23.el4.ia64.rpm

openssl-devel-0.9.7a-43.23.el4.ia64.rpm

openssl-perl-0.9.7a-43.23.el4.ia64.rpm

 

x86_64:

openssl-0.9.7a-43.23.el4.i686.rpm

openssl-0.9.7a-43.23.el4.x86_64.rpm

openssl-debuginfo-0.9.7a-43.23.el4.i386.rpm

openssl-debuginfo-0.9.7a-43.23.el4.i686.rpm

openssl-debuginfo-0.9.7a-43.23.el4.x86_64.rpm

openssl-devel-0.9.7a-43.23.el4.i386.rpm

openssl-devel-0.9.7a-43.23.el4.x86_64.rpm

openssl-perl-0.9.7a-43.23.el4.x86_64.rpm

 

Red Hat Enterprise Linux ES (v. 4 ELS):

 

Source:

openssl-0.9.7a-43.23.el4.src.rpm

 

i386:

openssl-0.9.7a-43.23.el4.i386.rpm

openssl-0.9.7a-43.23.el4.i686.rpm

openssl-debuginfo-0.9.7a-43.23.el4.i386.rpm

openssl-debuginfo-0.9.7a-43.23.el4.i686.rpm

openssl-devel-0.9.7a-43.23.el4.i386.rpm

openssl-perl-0.9.7a-43.23.el4.i386.rpm

 

x86_64:

openssl-0.9.7a-43.23.el4.i686.rpm

openssl-0.9.7a-43.23.el4.x86_64.rpm

openssl-debuginfo-0.9.7a-43.23.el4.i386.rpm

openssl-debuginfo-0.9.7a-43.23.el4.i686.rpm

openssl-debuginfo-0.9.7a-43.23.el4.x86_64.rpm

openssl-devel-0.9.7a-43.23.el4.i386.rpm

openssl-devel-0.9.7a-43.23.el4.x86_64.rpm

openssl-perl-0.9.7a-43.23.el4.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 . More contact

details at https://access.redhat.com/security/team/contact/

 

Copyright 2016 Red Hat, Inc.

-----BEGIN PGP SIGNATURE-----

Version: GnuPG v1

 

iD8DBQFW1cMAXlSAg2UNWIIRAho2AJ90ZmeRdG0ZG0fwEk7LS8xcn81iqwCfcEKp

O4ApRfTR31lmgraKkolN4LQ=

=mj9p

-----END PGP SIGNATURE-----

 

 

--