GLSA 200511-07: OpenVPN: Multiple vulnerabilities

http://security.gentoo.org/

Severity:	normal
Title:	OpenVPN: Multiple vulnerabilities
Date:	11/06/2005
Bugs:	#111116
ID:	200511-07

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	Architecture(s)
net-misc/openvpn	< 2.0.4	>= 2.0.4	All supported architectures

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

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 https://bugs.gentoo.org.