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Gentoo Linux Security Advisory GLSA 201603-15
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https://security.gentoo.org/
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Severity: Normal
Title: OpenSSL: Multiple vulnerabilities
Date: March 20, 2016
Bugs: #575548
ID: 201603-15

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Synopsis
========

Multiple vulnerabilities have been found in OpenSSL, the worst allowing
remote attackers to decrypt TLS sessions.

Background
==========

OpenSSL is an Open Source toolkit implementing the Secure Sockets Layer
(SSL v2/v3) and Transport Layer Security (TLS v1) as well as a general
purpose cryptography library.

Affected packages
=================

——————————————————————-
Package / Vulnerable / Unaffected
——————————————————————-
1 dev-libs/openssl < 1.0.2g-r2 >= 1.0.2g-r2

Description
===========

Multiple vulnerabilities have been discovered in OpenSSL, the worst
being a cross-protocol attack called DROWN that could lead to the
decryption of TLS sessions. Please review the CVE identifiers
referenced below for details.

Impact
======

A remote attacker could decrypt TLS sessions by using a server
supporting SSLv2 and EXPORT cipher suites as a
Bleichenbacher RSA padding oracle, cause a Denial of Service condition,
obtain sensitive information from memory and (in rare circumstances)
recover RSA keys.

Workaround
==========

A workaround for DROWN is disabling the SSLv2 protocol on all SSL/TLS
servers.

Resolution
==========

All OpenSSL users should upgrade to the latest version:

# emerge –sync
# emerge –ask –oneshot –verbose “>=dev-libs/openssl-1.0.2g-r2”

Please note that beginning with OpenSSL 1.0.2, in order to mitigate the
DROWN attack, the OpenSSL project disables SSLv2 by default at
build-time. As this change would cause severe issues with some Gentoo
packages that depend on OpenSSL, Gentoo still ships OpenSSL with SSLv2
enabled at build-time. Note that this does not mean that you are still
vulnerable to DROWN because the OpenSSL project has taken further
precautions and applications would need to explicitly request SSLv2. We
are working on a migration path to phase out SSLv2 that ensures that no
user-facing issues occur. Please reference bug 576128 for further
details on how this decision was made.

References
==========

[ 1 ] CVE-2016-0702
http://nvd.nist.gov/nvd.cfm?cvename=CVE-2016-0702
[ 2 ] CVE-2016-0703
http://nvd.nist.gov/nvd.cfm?cvename=CVE-2016-0703
[ 3 ] CVE-2016-0704
http://nvd.nist.gov/nvd.cfm?cvename=CVE-2016-0704
[ 4 ] CVE-2016-0705
http://nvd.nist.gov/nvd.cfm?cvename=CVE-2016-0705
[ 5 ] CVE-2016-0797
http://nvd.nist.gov/nvd.cfm?cvename=CVE-2016-0797
[ 6 ] CVE-2016-0798
http://nvd.nist.gov/nvd.cfm?cvename=CVE-2016-0798
[ 7 ] CVE-2016-0799
http://nvd.nist.gov/nvd.cfm?cvename=CVE-2016-0799
[ 8 ] CVE-2016-0800
http://nvd.nist.gov/nvd.cfm?cvename=CVE-2016-0800

Availability
============

This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:

https://security.gentoo.org/glsa/201603-15

Concerns?
=========

Security is a primary focus of Gentoo Linux and ensuring the
confidentiality and security of our users’ machines is of utmost
importance to us. Any security concerns should be addressed to
security@gentoo.org or alternatively, you may file a bug at
https://bugs.gentoo.org.

License
=======

Copyright 2016 Gentoo Foundation, Inc; referenced text
belongs to its owner(s).

The contents of this document are licensed under the
Creative Commons – Attribution / Share Alike license.

http://creativecommons.org/licenses/by-sa/2.5

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