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Gentoo Linux Security Advisory                           GLSA 200511-07
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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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