OpenVPN: Multiple vulnerabilities
Gentoo Linux Security Advisory
||GLSA 200511-07 / OpenVPN
||November 06, 2005
||November 06, 2005: 01
All supported architectures
The OpenVPN client is potentially vulnerable to the execution of arbitrary
code and the OpenVPN server is vulnerable to a Denial of Service issue.
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
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.
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"