full-disclosure - [ GLSA 200503-29 ] GnuPG: OpenPGP protocol attack

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Message-ID: <4243368E.3050605@gentoo.org>
Date: Thu Mar 24 21:52:37 2005
From: koon at gentoo.org (Thierry Carrez)
Subject: [ GLSA 200503-29 ] GnuPG: OpenPGP protocol attack

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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@...too.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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