[ GLSA 200503-29 ] GnuPG: OpenPGP protocol attack

[Thierry Carrez <koon () gentoo org>]

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Gentoo Linux Security Advisory                           GLSA 200503-29
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                                            http://security.gentoo.org/
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  Severity: Low
     Title: GnuPG: OpenPGP protocol attack
      Date: March 24, 2005
      Bugs: #85547
        ID: 200503-29

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Synopsis
========

Automated systems using GnuPG may leak plaintext portions of an
encrypted message.

Background
==========

GnuPG is complete and free replacement for PGP, a tool for secure
communication and data storage.

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

    -------------------------------------------------------------------
     Package          /  Vulnerable  /                      Unaffected
    -------------------------------------------------------------------
  1  app-crypt/gnupg       < 1.4.1                            >= 1.4.1

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

A flaw has been identified in an integrity checking mechanism of the
OpenPGP protocol.

Impact
======

An automated system using GnuPG that allows an attacker to repeatedly
discover the outcome of an integrity check (perhaps by observing the
time required to return a response, or via overly verbose error
messages) could theoretically reveal a small portion of plaintext.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All GnuPG users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=app-crypt/gnupg-1.4.1"

References
==========

  [ 1 ] CERT VU#303094
        http://www.kb.cert.org/vuls/id/303094
  [ 2 ] CAN-2005-0366
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-0366

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

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

  http://security.gentoo.org/glsa/glsa-200503-29.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
http://bugs.gentoo.org.

License
=======

Copyright 2005 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/2.0

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