[ GLSA 200511-07 ] OpenVPN: Multiple vulnerabilities

[Thierry Carrez <koon () gentoo org>]

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Gentoo Linux Security Advisory                           GLSA 200511-07
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                                            http://security.gentoo.org/
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  Severity: Normal
     Title: OpenVPN: Multiple vulnerabilities
      Date: November 06, 2005
      Bugs: #111116
        ID: 200511-07

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Synopsis
========

The OpenVPN client is potentially vulnerable to the execution of
arbitrary code and the OpenVPN server is vulnerable to a Denial of
Service issue.

Background
==========

OpenVPN is a multi-platform, full-featured SSL VPN solution.

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

    -------------------------------------------------------------------
     Package           /  Vulnerable  /                     Unaffected
    -------------------------------------------------------------------
  1  net-misc/openvpn       < 2.0.4                           >= 2.0.4

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

The OpenVPN client contains a format string bug in the handling of the
foreign_option in options.c. Furthermore, when the OpenVPN server runs
in TCP mode, it may dereference a NULL pointer under specific error
conditions.

Impact
======

A remote attacker could setup a malicious OpenVPN server and trick the
user into connecting to it, potentially executing arbitrary code on the
client's computer. A remote attacker could also exploit the NULL
dereference issue by sending specific packets to an OpenVPN server
running in TCP mode, resulting in a Denial of Service condition.

Workaround
==========

Do not use "pull" or "client" options in the OpenVPN client
configuration file, and use UDP mode for the OpenVPN server.

Resolution
==========

All OpenVPN users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=net-misc/openvpn-2.0.4"

References
==========

  [ 1 ] CVE-2005-3393
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2005-3393
  [ 2 ] CVE-2005-3409
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2005-3409
  [ 3 ] OpenVPN changelog
        http://openvpn.net/changelog.html

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

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

  http://security.gentoo.org/glsa/glsa-200511-07.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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