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Gentoo Linux Security Advisory                           GLSA 201408-14
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                                            http://security.gentoo.org/
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 Severity: Normal
    Title: stunnel: Information disclosure
     Date: August 29, 2014
     Bugs: #503506
       ID: 201408-14

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Synopsis
========

A vulnerability in stunnel might allow remote attackers to gain access
to private key information.

Background
==========

The stunnel program is designed to work as an SSL encryption wrapper
between a client and a local or remote server.

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

    -------------------------------------------------------------------
     Package              /     Vulnerable     /            Unaffected
    -------------------------------------------------------------------
  1  net-misc/stunnel              < 5.02                     >= 5.02

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

stunnel does not properly update the state of the pseudo-random
generator after fork-threading which causes subsequent children with
the same process ID to use the same entropy pool. ECDSA and DSA keys,
when not used in deterministic mode (RFC6979), rely on random data for
its k parameter to not leak private key information.

Impact
======

A remote attacker may gain access to private key information from ECDSA
or DSA keys.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All stunnel users should upgrade to the latest version:

  # emerge --sync
  # emerge --ask --oneshot --verbose ">=net-misc/stunnel-5.02"

References
==========

[ 1 ] CVE-2014-0016
      http://nvd.nist.gov/nvd.cfm?cvename=CVE-2014-0016

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

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

 http://security.gentoo.org/glsa/glsa-201408-14.xml

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 2014 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