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OpenVPN: Multiple vulnerabilities


1.  Gentoo Linux Security Advisory

Version Information

Advisory Reference GLSA 200511-07 / OpenVPN
Release Date November 06, 2005
Latest Revision November 06, 2005: 01
Impact normal
Exploitable remote
Package Vulnerable versions Unaffected versions Architecture(s)
net-misc/openvpn < 2.0.4 >= 2.0.4 All supported architectures

Related bugreports: #111116


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

2.  Impact Information


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


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.


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.

3.  Resolution Information


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


All OpenVPN users should upgrade to the latest version:

Code Listing 3.1: Resolution

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

4.  References


Page updated November 06, 2005

Summary: This is a Gentoo Linux Security Advisory

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