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Gentoo Linux Security Advisory                           GLSA 201408-10
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                                            http://security.gentoo.org/
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 Severity: Normal
    Title: Libgcrypt: Side-channel attack
     Date: August 29, 2014
     Bugs: #519396
       ID: 201408-10

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Synopsis
========

A vulnerability in Libgcrypt could allow a remote attacker to extract
ElGamal private key information.

Background
==========

Libgcrypt is a general purpose cryptographic library derived out of
GnuPG.

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

    -------------------------------------------------------------------
     Package              /     Vulnerable     /            Unaffected
    -------------------------------------------------------------------
  1  dev-libs/libgcrypt           < 1.5.4                    >= 1.5.4

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

A vulnerability in the implementation of ElGamal decryption procedures
of Libgcrypt leaks information to various side-channels.

Impact
======

A physical side-channel attack allows a remote attacker to fully
extract decryption keys during the decryption of a chosen ciphertext.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All Libgcrypt users should upgrade to the latest version:

  # emerge --sync
  # emerge --ask --oneshot --verbose ">=dev-libs/libgcrypt-1.5.4"

References
==========

[ 1 ] CVE-2014-5270
      http://nvd.nist.gov/nvd.cfm?cvename=CVE-2014-5270

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

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

 http://security.gentoo.org/glsa/glsa-201408-10.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