GLSA 200511-07 OpenVPN: Multiple vulnerabilities
Posted on: 11/06/2005 09:12 PM

A new security update has been released for Gentoo Linux - OpenVPN: Multiple vulnerabilities. Here the announcement:

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 lt; 2.0.4 gt;= 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 "gt;=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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